Which operation is to remove burrs from a plate after cutting?
A. Brushing
B. Filing
C. Scraping
D. Chiselling
Which is used for handling hot jobs?
A. Tongs
B. Shawel
C. Poker
D. Snips
Which is to wear for safety while handling thin sheets?
A. Tongs
B. Clamp
C. Hand gloves
D. Hand screen
Which file is having it’s width parallel through out it’s length?
A. Flat file
B. Hand file
C. Rasp file
D. Curved file
What are the gas flame combination used for welding ferrous and non ferrous alloys?
A. LPG + Air
B. Acetylene + Air
C. Acetylene + Oxygen
D. Hydrogen + Oxygen
Which nozzle size is selected to cut 15 mm thick MS plate?
A. 0.8 mm
B. 1.2 mm
C. 1.6 mm
D. 2.0 mm
Which is the hottest point in a oxyacetylene flame?
A. 2000 – 2200°C
B. 2500 – 2700°C
C. 2700 – 3000°C
D. 3000 – 3200°C
What safety measure to be taken while performing hacksaw cutting?
A. Improper working height
B. Pressure applied during sawing
C. Hold the handle firmly while sawing
D. Blade secured with adequate tension
Which of the following injury is common in gas welding?
A. Electric shock
B. Burns due to flame
C. Bleeding due to cut injury
D. Injury by hot flying particles
How many pressure gauges are in regulator gas welding plant?
A. One pressure gauge
B. Two pressure gauges
C. Three pressure gauges
D. Four pressure gauges
What procedure is followed to connect the cylinder to gas regulator in gas welding?
A. Open and close valve for few seconds
B. Open the valve for a longer period
C. No need to open the valve before connection
D. Open the valve for a few minutes of time
Which Material is used in Manufacture gas cylinder?
A. Forged steel
B. Nickel steel
C. Stainless steel
D. Solid Drawn steel
Which of the following metal is used for making nozzle in gas welding?
A. Brass
B. Bronze
C. Copper
D. Silver
What should be the angle for a double “J” butt joint?
A. 35°
B. 30°
C. 25°
D. 20°
What is the name of semi circular deposit on a weld bead?
A. Reinforcement
B. Sealing run
C. Under cut
D. Crater
What is to be placed at the root of a weld to contain the molten metal?
A. Facing
B. Backing
C. Sealing
D. Wearing
Which cut of files has two rows of teeth, cut diagonally to each other?
A. Rasp cut
B. Double cut
C. Curved cut
D. Single cut
Which type of blade set is available in a hacksaw blade with 1.00mm pitch?
A. Wave set
B. Regular set
C. Staggered set
D. Wave – staggered set
Which cutting tool is used to remove excess material on flat surface?
A. Flat chisel
B. Cross – Cut chisel
C. Diamond point chisel
D. Half – Round nose chisel
Which part of hammer is shaped to fit the handle rigidly?
A. Big hole
B. Eye hole
C. Key hole
D. Plain hole
What happened if bench vice is over tightened?
A. Box nut damaged
B. Spindle damaged
C. Work bench damaged
D. Work pieces damaged
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What treatment you should give to a person who suffered from electric shock?
A. Given an alcoholic drink
B. Given a cold drink
C. Made to walk
D. Keep warm and comfortable
How much gap is maintained between the grinding wheel and the work rest on a pedestal grinder?
A. 4 to 5 mm
B. 3 to 4 mm
C. 2 to 3 mm
D. 1 to 2 mm
Which tool is used to open the cylinder valves?
A. Wrench
B. Spindle key
C. Cutting player
D. Adjustable spanner
Which material is used to check the leakage of acetylene regulator connections?
A. Salt water
B. Plain water
C. Soap water
D. Chemical water
What action to be taken if a person in still contact with electric supply?
A. Break the contact by hand
B. Break the contact by dry wood
C. Break the contact by using iron rod
D. Break the contact by pushing with leg
What is done to avoid injury to fingers after hacksawing or chiselling a metal piece?
A. Filing
B. Cleaning
C. Grinding
D. Deburring
Which is the method to control back fire while welding?
A. Close oxygen control valve
B. Close acetylene control valve
C. First close the oxygen cylinder valve
D. First close the acetylene cylinder valve
Which hand tool is used to remove excessive adhering slag after gas cutting?
A. Chisel
B. Flat file
C. Chipping hammer
D. Cross cut hammer
What precaution you will follow in gas welding to avoid fire accidents?
A. Alert to go away
B. Keep fire extinguishers
C. Keep sand buckets near
D. Keep away the inflammable materials
Which injury is to be covered immediately by clean cloth on affected portion of the body?
A. Cut injury
B. Burn injury
C. Crush injury
D. Broken injury
Why should a welder clothes be free of oil or grease while welding?
A. To protect the job
B. To reflect the arc rays
C. To avoid catching of fire
D. To protect the welding machine
Which is the treatment given to a person affected by accident on the spot?
A. First aid
B. Second aid
C. First treatment
D. Second treatment
Which type of welding is done by a small hand weld gun with a non-consumable electrode?
A. SMAW
B. GMAW
C. GTAW
D. Induction welding
How a defective cutting nozzle is cleaned and rectified in gas cutting torch?
A. Wire brush
B. Safety pins
C. Silicon spray
D. Nozzle cleaner + Emery paper
What is the thickness of the plate that can be cut by using 0.8 mm cutting nozzle?
A. Upto 6 mm
B. Upto 19 mm
C. Upto 100 mm
D. Upto 150 mm
Which gas flame combination is preferable for under water gas cutting of steel?
A. Oxy coal gas
B. Oxy acetylene gas
C. Air acetylene gas
D. Oxy liquid petroleum gas
What is the special method for safe storage of acetylene gas in cylinder?
A. Stored in gaseous form
B. Stored in the solid form
C. Stored in semi-liquid form
D. Stored as dissolved gas in liquid acetone
What is the method to produce a straight bevelled cut?
A. Cutting on the marked line
B. Bending the torch at inclined angle
C. Supporting the nozzle head on the plate
D. Using two straight bars clamped as a guide
What are the impurities contained in generated acetylene gas?
A. Oxygen, hydrogen and carbon
B. Carbon monoxide unburnt ash
C. Hydrogen, dust particles, ash
D. Hydrogen, lime dust, ammonia and water vapour
Which material is stored at the bottom compartment of acetylene gas purifier?
A. Filter wool
B. Baffle plate
C. Pumice stone
D. Purifying Chemicals
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Which is a resistance welding method?
A. Spot welding
B. Forge welding
C. Thermit welding
D. Explosive welding
Which safety device is used to protect face from ultra-violet rays while welding?
A. Tong
B. Try square
C. Hand shield
D. Chipping hammer
Which safety device is to be used to protect eyes while grinding?
A. Hand screen
B. Sun glasses
C. Welding goggles
D. White goggles
Which safety device is used to protect the body from hot spatters while welding?
A. Helmet
B. Leg guards
C. Hand sleeves
D. Leather apron
What is the purpose of providing root gap?
A. To avoid cracking
B. To avoid porosity
C. To avoid distortion
D. To increase depth of penetration
What is the fusion zone?
A. Fused depth
B. Lack of fusion
C. Edge of the joint
D. Surface of the joint
Which tool is to be used to remove slag on welded bead?
A. Chisel
B. Try square
C. Chipping hammer
D. Ball pane hammer
What is the use of oxidising flame?
A. Suitable for cast iron welding
B. Suitable for brass welding
C. Suitable for mild steel welding
D. Suitable for stellite, pipe welding
What are the solutions for the safety in the gas welding?
A. Not learning safety instructions
B. Not Checking on hose and gauge for damage
C. No checking of the cylinder
D. Work area free from flammable material
What is the treatment to a person having eye irritation caused by arc flashes?
A. Use ear drops
B. Use eye drops
C. Use nose drops
D. Use water drops
Which safety device is fitted to avoid explosion of acetylene generator due to high pressure?
A. Cylinder valve
B. Acetylene generator outlet pipe
C. Hydraulic back pressure valve
D. Baffle plate
What is the effect of ultra violet and infrared rays if a welder exposed to that rays?
A. Effect to body
B. Effect to eyes
C. Effect to face
D. Effect to skin
Which type of transformer used in arc welding?
A. Step up
B. Step down
C. One – to – one
D. Capable of increasing supply voltage
Which position is advantageous for easy welding?
A. Flat
B. Vertical
C. Over head
D. Horizontal
Which one of the following is used to convert AC to DC supply in a welding machine?
A. Rectifier set
B. Motor generator set
C. Engine generator set
D. Welding transformer
What is the metal used to make earth clamp in a welding machine?
A. Iron
B. Brass
C. Aluminium
D. Copper alloy
How much current should be set, to weld a 10 mm thick plates, by arc welding?
A. 70 Amps
B. 80 Amps
C. 90 Amps
D. 110 Amps
What is the term for the depth of fusion, from the surface of the weld metal plate?
A. Leg length
B. Fusion zone
C. Penetration
D. Heat affected zone
What should be the angle for a double bevel butt joint?
A. 45°
B. 35°
C. 25°
D. 20°
What is the name of joint if two members welded in the same plane?
A. Lap joint
B. Tee joint
C. Butt joint
D. Edge joint
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What is defined as vertical position of groove welding?
A. 1G
B. 2G
C. 3G
D. 6G
Which type of metal is used in a welding cable?
A. Iron
B. Brass
C. Bronze
D. Copper
Which of the following gas is used in TIG welding?
A. Helium
B. Oxygen
C. Hydrogen
D. Carbon dioxide
Which of the accessories should be worn during overhead welding?
A. Helmet
B. Sun glass
C. Hand screen
D. Welding goggles
Which one of the following do not assist fire?
A. Fuel
B. Oxygen
C. Ignition
D. Nitrogen
Which type of polarity is used in aluminium welding?
A. Rectifier set
B. AC Transformer
C. Reverse polarity
D. Straight polarity
What is polarity?
A. Circuit of current
B. Direction of current
C. Open circuit of current
D. Opposite direction of current
What is the effect long arc in welding?
A. Normal penetration
B. More penetration
C. Less penetration
D. Less weld deposit
Which type of polarity used in bare wire electrode?
A. Straight polarity
B. Reverse polarity
C. AC Transformer
D. Rectifier set
What are the two types of MS pipes?
A. Forged pipe / Rolled pipe
B. Strip rolled / moulded type
C. Bent sheet pipe / Hot forged
D. Seamless pipe / Resistance welded pipe
Which type of electrode produces short arc length?
A. Heavy coated electrodes
B. Light coated electrodes
C. Medium coated electrodes
D. Super heavy coated electrodes
Which type of arc length produces deep penetration weld?
A. Long arc length
B. Short arc length
C. Medium arc length
D. Too long arc length
What is the conversion function of a rectifier?
A. AC to AC
B. DC to DC
C. AC to DC
D. DC to AC
Which arc length produces correct fusion?
A. Long arc length
B. Short arc length
C. Normal arc length
D. Too long arc length
Which type of polarity is used in welding non ferrous metals?
A. AC Transformer
B. Reverse polarity
C. Straight polarity
D. DC Motor generator
Which is used for arc welding if there is no electric power supply?
A. Rectifier set
B. Transformer set
C. Motor generator set
D. Engine generator set
What is the angle of electrode while welding in vertical position?
A. 60° to 70°
B. 70° to 80°
C. 80° to 90°
D. 90° to 100°
Which type of arc produces humming sound?
A. Long arc length
B. Short arc length
C. Normal arc length
D. Too long arc length
Which types of arc length used in thin sheet metals?
A. Long arc length
B. Short arc length
C. Medium arc length
D. Deep short arc length
Which type polarity used in sheet metal welding?
A. Rectifier set
B. AC Transformer
C. Reverse polarity
D. Straight polarity
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Which polarity is used in welding with heavy and super heavy coated electrodes?
A. AC Transformer
B. Reverse polarity
C. Straight polarity
D. AC Motor generator
Which polarity used in welding cast iron?
A. Rectifier set
B. AC Transformer
C. Reverse polarity
D. Straight polarity
What should be the angle of electrode in the flat position welding?
A. 50° to 70°
B. 60° to 70°
C. 70° to 80°
D. 80° to 90°
What is the size of nozzle suitable for welding 50mm dia pipe, with 3.15mm wall thickness?
A. 5
B. 7
C. 10
D. 13
What is the purpose of wrapping the weld cable around the job in welding?
A. To control arc blow
B. To control arc speed
C. To control arc length
D. To control distortion
What is the purpose of fixing run on, run off plates in arc welding?
A. Control arc blow
B. Control porosity
C. Control distortion
D. Control over heating
Which defect can be controlled by keeping a magnetic bridge on the top of the groove joint?
A. Arc blow
B. Distortion
C. Uneven bead
D. Slag inclusion
Which among the joints are covered under fillet group?
A. T joint, Lap joint
B. T joint, Corner joint
C. Corner joint, Edge joint
D. T joint, Lap joint, Corner joint, Edge joint
What happens if the root gap is lesser than one sixth of plate thickness?
A. More chances of distortion
B. More penetration will result
C. Likely defects like blowhole, porosity
D. Base metal not fused till the bottom of joint
Which arc length produces popping sound?
A. Long arc length
B. Short arc length
C. Normal arc length
D. Too long arc length
What arc length should be used to reduce the spatter?
A. Long arc length
B. Short arc length
C. Normal arc length
D. Too long arc length
What is the indication of wrong polarity in DC welding?
A. Electrode become red hot
B. Electrode will freeze with the job
C. Excess spatters and poor penetration
D. It will produce edge of plates melted off
How do you name the depression formed at the end of the weld?
A. Crack
B. Crater
C. Pin hole
D. Blow hole
What defect will occur due to magnetic field while using DC supply in arc welding?
A. Crack
B. Arc blow
C. Over lap
D. Distortion
Which defect will occur, when the equipment is changed for AC to DC supply in arc welding?
A. Arc blow
B. Over lap
C. Weld crack
D. Distortion
What is the current range required for 3.15mm dia MS electrode in arc welding?
A. 40 – 50 A
B. 50 – 60 A
C. 70 – 80 A
D. 100 – 110 A
What is the name of last bit of an discarded electrode?
A. Red end
B. Dead end
C. Stub end
D. Waste end
How many groups of mild steel pipes are there?
A. Two groups
B. Five groups
C. Four groups
D. Three groups
How a pipe is specified?
A. Dia only
B. Length only
C. Outer dia only
D. Outer dia x inner dia x length
What should be the bevel angle for edge preparation of 6mm thick pipe welding?
A. 30° – 35°
B. 40° – 45°
C. 60° – 65°
D. 70° – 75°
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What is the purpose of copper coating on mild steel filler rod used in gas welding?
A. Rust proof
B. Water proof
C. Moisture proof
D. Increased filler dia
Which metal in welding process is subjected to “Weld decay” defect?
A. Brass
B. Copper
C. Mild steel
D. Stainless steel
Which filler rod is used for bronze welding of cast iron, malleable iron and copper?
A. Manganese, Bronze, filler rod
B. Copper, Phosphorus, filler rod
C. Copper, Phosphorus alloy filler rod
D. Copper, Zinc, Nickel filler rod
What does the third digit of AWS codification in EB 5426HJX represent?
A. Type of current
B. Type of covering
C. Type of tensile strength
D. Type of welding position
Which accessory is used to protect the eyes during gas welding?
A. Helmet
B. Hand screen
C. Colour goggles
D. Grinding goggles
What is the composition of acetylene gas?
A. C – 72.3% H – 27.7%
B. C – 82.3% H – 17.7%
C. C – 90% H – 10%
D. C – 92.3% H – 7.7%
Which size of CCMS filler rod is to be used for welding plate of 8mm thick with ‘V’ edge preparation?
A. 3.15 mm Ø
B. 4.0 mm Ø
C. 5.0 mm Ø
D. 6.3 mm Ø
How many segments are to be selected for welding 50 mm j pipe?
A. 3 segments
B. 4 segments
C. 6 segments
D. 8 segments
What type of edge preparation is needed, for gas welding a pipe, with wall thickness 6mm?
A. Single “V”
B. Single bevel
C. Square edge with root gap
D. Square edge without root gap
How many equal divisions should be made while developing a “T” pipe joint?
A. 4 equal divisions
B. 6 equal divisions
C. 9 equal divisions
D. 12 equal divisions
What is the name of small metal particles which are thrown out of the arc during welding?
A. Slag
B. Spatters
C. Stub end
D. Weld metal
How the construction of a nozzle for gouging is identified?
A. Straight nozzle with single preheating hole
B. Bent nozzle with sectorial preheating holes
C. Fully bent nozzle with circular preheating holes
D. Slightly bent nozzle with circular preheating six holes
What does the fourth digit indicate as per AWS electrode coding?
A. Welding current
B. Tensile strength
C. Welding position
D. Type of flux coating
Which type of stainless steel is weldable?
A. Nickel type
B. Ferrite type
C. Stabilized type
D. Chromium type
What is the pre-heating temperature of cast iron?
A. 200 to 310°C
B. 250 to 350°C
C. 300 to 350°C
D. 350 to 450°C
What is the root run?
A. Backing run
B. The first run is root run
C. The third run is root run
D. The second run is root run
What do you call the non – coated electrodes?
A. Row electrode
B. Bare electrode
C. Base electrode
D. Deep penetration electrode
How is the electrode size identified?
A. Length of electrode
B. Thickness of flux coated
C. Diameter (over all) of electrode
D. Diameter of inner core wire
What are the standard electrode lengths available?
A. 250 mm and 350 mm
B. 350 mm and 450 mm
C. 400 mm and 500 mm
D. 500mm and 600mm
What is the grade of hacksaw blades with pitch 0.8mm?
A. Fine
B. Medium
C. Course
D. Rough
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What does the letter ‘X’ indicate in the electrode classification of EB5426 H1 J X?
A. Covered electrode
B. Increase metal recovery
C. Hydrogen controlled electrode
D. Radio graphic quality electrode
What is the percentage of carbon in medium carbon steel?
A. 0.05% to 0.30%
B. 0.05% to 0.8%
C. 0.30% to 0.6%
D. 0.6% to 1.2%
What is the defect of metal flowing into the surface of base metal without fusing it?
A. Over lap
B. Under cut
C. Lack of fusion
D. Lack of penetration
Which one of the defect is caused by low current in arc welding?
A. Porosity
B. Under cut
C. Lack of fusion
D. Excessive penetration
What is the cause of hair line separation in the bead in arc welding?
A. Fast cooling
B. Slow cooling
C. Long arc length
D. Wrong selection of electrode
What is the name of the steel material which are not weldable?
A. High carbon steel
B. Medium carbon steel
C. Austenitic stainless steel
D. Ferrite and martensitic stainless steel
Which is used to cut thin pipes of smaller sizes?
A. Chisel
B. Hack sawing
C. Pipe cutter
D. Lathe parting tool
What is the base for selecting the nozzle size for gas welding of a pipe?
A. Groove angle
B. Welding position
C. Diameter of pipe
D. Pipe wall thickness
Which type of filler rod shall contain higher percentage of iron?
A. Ferrous
B. Non – ferrous
C. Alloy type of ferrous metals
D. Alloy type of non – ferrous metals
What is the process of heating steel to specific temperature and cooling suddenly?
A. Annealing
B. Hardening
C. Tempering
D. Quenching
What is the main purpose of ‘Normalising’ steel?
A. To control hardness
B. To prevent cracking
C. To make welding operation easier
D. To produce fine grain of uniform structure
What is the purpose of setting root gap?
A. To over some under cut
B. To control distortion
C. To get good penetration
D. Gap get closed due to expansion
Which of the following metals have high thermal conductivity?
A. Brass
B. Bronze
C. Copper
D. Aluminium
What is the process of hot weld joint rapidly hammered to relieve internal stresses?
A. Peening
B. Annealing
C. Heat treatment
D. Straightening
Which type of cast iron possess higher hardness?
A. Grey cast iron
B. White cast iron
C. Nodular cast iron
D. Malleable cast iron
Which type of cast iron is soft?
A. Grey cast iron
B. White cast iron
C. Nodular cast iron
D. Malleable cast iron
Which size of filler rod should be used to weld 2mm thick MS sheet?
A. 1.6 mm
B. 2.0 mm
C. 2.5 mm
D. 3.15 mm
What is the main function of the flux coating in electrodes?
A. To prevent rusting
B. To stabilize the arc
C. To control arc temperature
D. To increase welding current
What is the purpose of oxygen lever in gas cutting?
A. Pre heat the base metal
B. Push the molten metal
C. Remove the excess metal
D. Release excess oxygen and to push the molten metal
Which gauging nozzle is selected for rivet head cutting?
A. Bent nozzle with three pre-heating holes
B. Straight nozzle with six pre-heating holes
C. Bent nozzle with six holes
D. Flute cutting straight with six holes
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What benefit we get out of a carburising flame?
A. Suitable for brass, copper welding
B. Suitable for stellite, flame cleaning
C. Suitable for mild steel, stainless steel
D. Suitable for pure aluminium, cast iron and brass welding
What are the defects in generated acetylene gas?
A. Oxygen, hydrogen and carbon
B. Carbon monoxide unburnt ash
C. Hydrogen, dust particles, ash
D. Hydrogen, lime dust, ammonia and water vapour
What is the range of pressure gauge used in an oxygen cylinder used in gas welding?
A. 120 to 150 Kg/cm²
B. 110 to 150 Kg/cm²
C. 100 to 150 Kg/cm²
D. 90 to 150 Kg/cm²
What should be the angle of filler rod, by rightward welding?
A. 30° – 40°
B. 40° – 50°
C. 50° – 60°
D. 60° – 70°
What thickness of plate, gas welding by forehand technique can be used without edge preparation?
A. Up to 2.5 mm
B. Up to 3.15 mm
C. Up to 4 mm
D. Up to 5 mm
What flux is used in welding brass?
A. Anti – borax
B. Borax paste
C. Cryolite and barium chloride
D. Zinc chloride and potassium dichromate
What flux is to be used for gas welding stainless steel plates?
A. Borax flux
B. Anti – Borax
C. Cryolite and barium chloride
D. Zinc chloride and potassium dichromate paste
Which filler rod to be used for gas welding aluminium?
A. Silicon – brass
B. Silicon – manganese
C. Copper – Silver alloy
D. Pure aluminium, 5% silicon aluminium alloy
What should be the pre – heating temperature of aluminium job for gas welding?
A. 200°C – 400°C
B. 250°C – 400°C
C. 300°C – 400°C
D. 350°C – 400°C
What is the welding position as per ASME for a pipe joint held vertically, welding in a horizontal line?
A. 1G
B. 2G
C. 5G
D. 6G
What procedure is followed in welding pipe in 5 G position?
A. Rotate pipe and weld vertically
B. Pipe not rotated weld vertically
C. Pipe not rotated and pipe axis 450
D. Pipe welded 12’o clock to 6’o clock either by uphill or downhill method
What size of CCMS filler rod is used for finish run of ɸ 50mm pipe root welded using ɸ1.65mm filler?
A. ɸ 1.6 mm
B. ɸ 3.0 mm
C. ɸ 3.5 mm
D. ɸ 4.0 mm
What size of electrode is used to weld 5 mm wall thickness pipe?
A. ɸ 2.5 mm
B. ɸ 3.15 mm
C. ɸ 4.00 mm
D. ɸ 5.00 mm
Which test indicates the hardness of a metal?
A. Brinell test
B. Tensile test
C. Charpy izod test
D. Ultrasonic inspection
What type of preheating is done only at the portions to be welded?
A. Full preheating
B. Local preheating
C. Direct preheating
D. Indirect preheating
Which type of polarity is used in welding non ferrous metals?
A. AC Transformer
B. Reverse polarity
C. Straight polarity
D. DC Motor generator
Which type of arc does not have control on the molten pool?
A. Long arc length
B. Short arc length
C. Normal arc length
D. Too short arc length
Which of the following produces unstable arc?
A. Long arc length
B. Short arc length
C. Normal arc length
D. Too long arc length
What are the four clock positions, in pipe welding?
A. 6, 12, 3, 9’o clock points
B. 11, 5, 8, 2’o clock points
C. 10,4, 1, 7’o clock points
D. 9,3, 12, 6’o clock points
What is the 6’o clock position in CW pipe welding refers to in 5G position?
A. Down hand position
B. Horizontal position
C. Over head position
D. Vertical up hill position
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What procedure is to be followed for welding pipes under 6G position?
A. Pipe not rotated weld vertical
B. Rotate pipe and deposit weld vertical
C. Pipe not rotated weld deposit horizontal
D. Pipe not rotated and pipe axis 45° angle deposit weld flat, vertical
Which element filler rod is used to weld stainless steel plates?
A. Osmium
B. Podium
C. Argentum
D. Molybdenum, columbium
Which are the common alloying element of brass?
A. Copper and tin
B. Bismuth and tin
C. Antimony and tin
D. Copper and zinc
Which of the following aluminium alloys consists of 1% iron & silicon?
A. Duralumin
B. Wrought alloy
C. Aluminium cast alloy
D. Commercially pure aluminium
What is the purpose of cleaning of sheets before doing gas welding?
A. To avoid over lap
B. To avoid porosity
C. To avoid under cut
D. To Control distortion
Which type welding uses a non – ferrous filler with melting point above 450° than base metal?
A. Brazing
B. Soldering
C. Arc welding
D. Gas welding
Which welding process enables to weld dissimilar metals?
A. Brazing
B. Seam welding
C. Spot welding
D. Fusion welding
What type of gas flame is used to weld 2mm mild steel by brazing method?
A. Neutral flame
B. Carburising flame
C. Oxidising flame
D. Oxy-hydrogen flame
Which system of welding is free from “Arc blow”?
A. AC welding
B. DC Reverse polarity
C. DC straight polarity
D. Welding with long arc
What is the effect of expansion and contraction due to heat in welding?
A. Peening
B. Arc blow
C. Distortion
D. Metal force
Which one of the following methods of welding is not a method used to control distortion?
A. Skip welding
B. Back step welding
C. Right hand welding
D. Intermittent welding
Which one of the below is to control distortion?
A. Use large size electrode
B. Use small size electrode
C. Use few passes with large electrode
D. Use more passes with small electrode
What is the rule for deciding the length of intermediate tacks?
A. 3 to 4 times plate thickness
B. 2 to 3 times plate thickness
C. 5 times the plate thickness
D. 50mm irrespective of plate thickness
Which type of cast iron offers greater resistance to shock?
A. Grey cast iron
B. White cast iron
C. Nodular cast iron
D. Malleable cast iron
Which type of cast iron possess higher compressive strength?
A. Grey cast iron
B. White cast iron
C. Nodular cast iron
D. Malleable cast iron
What is the angle of pipe axis with the base for making an elbow joint?
A. 30°
B. 45°
C. 75°
D. 90°
What method is followed to make a circular gas cutting?
A. Using hand as a guide
B. Using a guide clamp fitted to torch body
C. Step by step cutting circular segments
D. Manual rotation on the circumference of the circle
Why deposited bead is not in uniform size?
A. Incorrect flame setting
B. Wrong angle of blow pipe
C. Wrong angle of filler rod
D. Variation in speed of travel and angle
Which element is present in contact electrodes in large proportion?
A. Carbon
B. Silicon
C. Manganese
D. Iron powder
Which size of filler rod should be used to weld 2.5mm thick plates,using nozzle 5 by leftward technique?
A. 1.60 mm
B. 2.00 mm
C. 2.50 mm
D. 3.15 mm
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Which process causes the increase in the strength of part after fabrication?
A. Hardening
B. Tempering
C. Quenching
D. Normalising
How the repairs of cracks in cast iron component carried out?
A. By using clamps during welding process
B. Similar to arc welding mild steel plate
C. Local preheating, leftward welding technique flame heating each layer
D. Cracks repaired using appropriate electrode
Which heat treatment process causes the reduction of brittleness in the steel?
A. By annealing
B. By hardening
C. By tempering
D. By normalising
What is the cause of porosity in arc welding?
A. Damp electrodes
B. Carbon electrodes
C. Over size electrodes
D. Low hydrogen electrodes
What is the welding defect in base metal gets melted and a groove formed along the toe of the weld?
A. Undercut
B. Blow holes
C. Reinforcement
D. Lack of penetration
What is the name of the steel material that is not weldable?
A. High carbon steel
B. Medium carbon steel
C. Austenitic stainless steel
D. Ferrite & martensitic stainless steel
What is the defect due to non cleaning the surfaces before welding?
A. Over lap
B. Lack of fusion
C. Surface porosity
D. Small cracks in bead
What is the reason for lack of fluidity in molten metal in braze welding?
A. Over heating
B. Improper flame
C. Inadequate preheating
D. Improper cleaning and less use of flux
What is the reason for the defect of more spatter during arc welding?
A. Insufficient root gap
B. Welding current too high
C. Wrong angle of electrode
D. Use of a very short arc length
What is the welding defect, with no fusion of base metal on root face, side face or between the weld run?
A. Porosity
B. Under cut
C. Lack of fusion
D. Lack of penetration
What is the result of inner cone of flame touching the molten metal while welding?
A. Cause to over lap
B. Cause to back fire
C. Cause to porosity
D. Cause to flame shape out
What defect will occur due to incorrect tilt of blow pipe?
A. Crater at end
B. Weld porosity
C. Lack of root penetration
D. Under cut in weld joints
How is the scale and oxide removed from stainless steel weld?
A. Peening
B. Cooling in oil
C. Cooling in sand
D. Heating up to 950° to 1100°C and quenched in water
What makes for the buckling of weld joint, in stainless steel during cooling?
A. Over heated zone
B. Low thermal conductivity
C. Chromium contamination
D. High thermal conductivity
What is the name of short weld made prior to the welding to hold the plates in perfect alignment?
A. Bead weld
B. Tack weld
C. String bead
D. Strong weld
What type of defect will occur due to evaporation of the trapped gas from the liquid metal?
A. Arc blow
B. Porosity
C. Over lap
D. Crack
Which welding the slag inclusion defect will occur?
A. Manual metal arc welding
B. Tungsten invert gas welding
C. Metallic invert gas welding
D. Oxy – acetylene gas welding
What will happen if the current is low while arc welding?
A. Formed over lap
B. Spatters are more
C. Electrode fused speedly
D. Base metal edges not melt properly
What is the use of intermediate tacks on a weld setting of plates?
A. To reduce the welding run
B. To control defects in weld joint
C. To speed up the welding joint
D. Align and to maintain the position of joint
What is the main reason, that aluminium is difficult to weld?
A. Less weight
B. Oxide formation
C. High thermal conductivity
D. Better strength weight ratio
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When does the defect of gouging on cutting face takes place?
A. Too much pre-heating
B. Too slow cutting speed
C. Excessive speed, inadequate pre- heating
D. Too much cutting oxygen pressure
What method of heating is done to remove bending distortion of weld joint with wedge shaped area?
A. Spot heating
B. Pipe – needle heating
C. Triangular heating
D. Checker – board heating
What is the purpose of inspection in welding?
A. Determine faults and quality weld
B. Determine the material
C. Determine the welded metal
D. Determine the electrode fusibility
How many stages are there in visual inspection in NDT?
A. Two stages
B. Three stages
C. Four stages
D. Five stages
Which type of test is generally not used on the final product?
A. Non-destructive test
B. Semi destructive test
C. Destructive test
D. Non destructive & semi destructive
What are the common welding tests performed in workshop?
A. Nick break, free bend, fracture
B. Tensile test
C. Guided bend test
D. Impact and particle test
How many types of common non destructive test are there?
A. 2 types
B. 3 types
C. 4 types
D. 5 types
What type of test is visual inspection test?
A. Non-destructive test
B. Destructive test
C. Non-destructive and destructive
D. Performance test
What is the NDT method using sound as a source?
A. Visual inspection
B. Pressure test
C. Stethoscopic test
D. Magnetic particle test
What activities contribute to the fabrication cost?
A. Preparation, welding, finishing
B. Raw metal, welding, finishing
C. Welding, finishing, transportation
D. Finishing, transportation, marketing
What is the test in which the weld quality is tested without destroying the job?
A. Destructive test
B. Non-destructive test
C. Semi-destructive test
D. Visual inspection test
Which stage the root gap is set in welding process?
A. Before welding stage
B. During welding stage
C. After welding stage
D. Finishing welding stage
Where do we cut 2.0 mm depth by hand saw to conduct Nick-break test?
A. Cut to base metal
B. Cut along centre line of weld
C. Cut to weld metal and base metal
D. Don’t cut to metal
Which is a non destructive test?
A. Without damaging the job
B. With damaging and with distracting
C. Nick break test
D. Free bend test
The welding cost estimation of power cost is (V x A/1000) x (T/60) x (1/E) x rate per unit is formula. What is the ‘E’ identify?
A. Electrode consumed
B. Electrode of weld metal
C. Efficiency of machines
D. Efficiency of weld meter
What is the cost, involving office expenses, lighting, rent etc but not directly related to the job?
A. Power cost
B. Labour cost
C. Finishing cost
D. Over head cost
What is the test to find weld defect using sound waves echo displayed on calibrated screen?
A. Stethoscopic test
B. Radiographic test
C. Ultrasonic test
D. Liquid penetration test
What is the test if the weld specimen is placed in between the x-ray unit and film?
A. Ultra sound test
B. Radiographic test
C. Magnetic particle test
D. Liquid penetrant test
What are the costs involved in welding job?
A. Electrode, power, labour
B. Material and machining
C. Material and preparation
D. Proportion cost and works cost
What type of safety equipment is worn while checking the welding joint of a overhead crane frame?
A. Apron
B. Helmet
C. Hand gloves
D. Hand screen
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What is the name of welding process if the arc produced by a consumable metal electrode is protected by inert gas?
A. MAG welding
B. MIG welding
C. TIG welding
D. Plasma welding
How is thermit mixture ignited?
A. Petrol
B. Diesel
C. Fire stick
D. By match or magnesium ribbon
Which welding method starting of welding done by using steel wool or iron powder?
A. SAW
B. GTAW
C. GMAW
D. MMAW
What are the gases mixed for shielding in FCAW?
A. Argon and O₂
B. Argon and CO₂
C. Helium and CO₂
D. Argon and helium
How many types of flux cored wires are used in FCAW?
A. 2 types
B. 3 types
C. 4 types
D. 5 types
Which type of electrode provides protective slag in flux cored arc welding?
A. Tubular cored flux electrode
B. External cored electrode
C. Additional cored flux electrode
D. Shielding gas type only
What device is used to protect face from UV and Infra-red radiation during welding?
A. Blue goggles
B. Plain goggles
C. White goggles
D. Helmet with filtered colour glass
What protective equipment (PPE) is used to protect hand from burning injury?
A. Apron
B. Goggles
C. Protective shield
D. Leather gloves
Which gas is generated during GMAW on using CO₂ as shielding gas?
A. Helium
B. Carbon monoxide
C. Argon
D. Oxygen
What type of lens shade is to be fixed in helmet while doing MIG welding?
A. A # 09
B. A # 10
C. A # 11
D. A # 12
What is the lens shade fitted in a helmet as per the recommendation of welding code for setting of 150 Amps for MMAW?
A. A # 10
B. A # 11
C. A # 12
D. A # 13
Which type of apron is suitable to protect from heat and radiation during welding?
A. Silk apron
B. Cotton apron
C. Leather apron
D. Asbestos apron
Which angle of pre setting is to compensate distortion on horizontal single V butt joint metal thickness 10 mm and root gap 2mm ?
A. 173°
B. 178°
C. 180°
D. 183°
How many types of basic welding positions in GMA welding?
A. 2 types
B. 3 types
C. 4 types
D. 5 types
Which is the weld position of GMA welding if the weld is deposited underside of the job?
A. Vertical position
B. Horizontal position
C. Over head position
D. Down head position
What type of joints are made by the groove welds in GMA welding?
A. Butt weld
B. T weld
C. Corner weld
D. Lap weld
Which shielding gas is used in MIG welding?
A. Argon
B. Argon + 20% CO2
C. Argon + 1% oxygen
D. Argon + 10% hydrogen
Which type of weld is developed electro slag welding?
A. Gas welding
B. Resistance welding
C. Submerged arc welding
D. Shielded metal arc welding
How many types of metal transfer in GMAW/CO2 welding process?
A. One
B. Two
C. Three
D. Four
What is the ability of metal to cut another metal?
A. Creep
B. Fatigue
C. Hardness
D. Strength
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What ampere range is required for setting 1.2mm filler wire for welding mild steel in MIG/MAG welding?
A. 50 – 100 Amps
B. 70 – 120 Amps
C. 90 – 150 Amps
D. 100 – 225 Amps
What is the temperature produced by chemical reaction in thermit welding?
A. 5000° C
B. 5000° F
C. 4000° C
D. 4000° F
Which type of welding is to be used to make joint of thick pipes of rails?
A. Thermit welding
B. Non – Pressure Thermit welding
C. Pressure Thermit welding
D. Fusion Thermit welding
Where is electron beam generated, controlled and accelerated?
A. Atmosphere
B. Electron gun
C. Transport system
D. Vacuum chamber
What is the source of heat to melt the work piece in an electron beam welding?
A. By heat
B. By high speed electrons
C. By beam heat
D. By current
Which welding process granulated flux is fed through hopper to the welding spot?
A. GTAW
B. SMAW
C. GMAW
D. SAW
What are the positions used in SAW?
A. Flat
B. Vertical
C. Overhead
D. Flat and horizontal
Which type of welds are often used to assist assembly or to maintain edge alignment during welding?
A. Root run weld
B. Level weld
C. Tack weld
D. Stringer bevel
What is the usual torch angle tilt on either side of vertical in GMAW?
A. 10° – 20°
B. 20° – 25°
C. 25° – 30°
D. 30° – 35°
What defects occur to a weld joint, if it is provided with insufficient heat input?
A. Lack of fusion
B. Lack of penetration
C. Lack of metal deposit
D. Uneven bead deposit
What is the solution if burn back occurs due to irregular wire feeding in GMAW process?
A. Cut out kink wire
B. Replace of spool
C. Cut the kink wire and replace spool
D. Adjusted to kinked wire again
Which metal surfacing method is ideal for thin layers that can flow to corner and edges of the job?
A. TIG welding
B. MIG welding
C. Oxy-acetylene welding
D. Submerged arc welding
Which type of core wire is suitable for welding carbon steel, alloy steel and stainless steel under FCAW?
A. Flux cored electrode
B. Gas shield flux wire
C. Used flux core and gas shielded
D. Flux is external and shielded
What is the distinct differences between GMAW and FCAW equipments?
A. Nozzle and torch
B. Construction of torch and feed rollers
C. Machine and torch
D. Feed rolls and gas cylinders
What is the name of metal transfer system in FCAW?
A. Dip transfer
B. Free flight transfer
C. Globular transfer
D. Purged transfer
Why the argon and CO2 mixture is used in FCAW?
A. Smooth spray transfer, with minimum slag
B. Smooth globular transfer
C. Smooth pulsed transfer
D. Smooth dip transfer
Why different type of pressure rollers are used in FCAW?
A. Knurled rollers
B. Without roller of travel wire
C. With pressure of tubular wire
D. Positive feeding without pressure on tubular wire
Which type of welding under FCAW, is more suitable for welding all types of steel?
A. Only use flux cored electrode
B. Only use gas shielding flux
C. Using flux cored and additional gas shielding
D. Flux is external and also gas external
What type of hand tool is used to open a gas cylinder in welding practice?
A. X key
B. Allen key
C. DE spanner
D. Spindle key
Why the welder’s cloth should be free from oil, grease etc, while welding?
A. To protect the job
B. To deflect the arc rays
C. To avoid catching fire
D. To safe guard your inner cloth
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Which electrode wire is more suitable for carbon steel fabrication in GMAW process?
A. 70S – 6
B. 70T – 2
C. 70S – 2
D. 70S – 3
Which metal transfer process in GMAW produces strong weld with least spatter?
A. Spray transfer
B. Globular transfer
C. Dip transfer
D. Pulsed transfer
How the pre-heating temperature is checked before welding wrought iron or cast metals?
A. Flow of spatters
B. Size of blow holes
C. Temperature indicating crayon
D. Count of pin holes
Which is the operation to relieve residual stresses from the welding joint?
A. Pre-heating
B. Peening
C. Drilling
D. Post heating
Which is the only welding position in electro slag welding process?
A. Down hand
B. Horizontal
C. Vertical
D. Over head
Why carbon and manganese are added to plain thermit mixture on rail welding?
A. To get good fusion
B. To get hardness
C. To get fine welding
D. To get smooth finishing
What type of weld is used on prepared holes of overlap joints?
A. Tack weld
B. Fillet weld
C. Backing weld
D. Plug or slot weld
Which is the weld position of GMA welding if the filler metal is deposited from the upper side of the joint during welding?
A. Vertical position
B. Horizontal position
C. Over head position
D. Down hand position
What is the type of weld position in which the weld metal is deposited under side of the joint?
A. Down hand position
B. Horizontal position
C. Vertical position
D. Overhead position
What is the electrode inclination to the metal surface in T-joint welding of 10 mm thickness metal by down hand position?
A. 30°
B. 45°
C. 60°
D. 75°
What is the usual length of tack weld in a T- joint in GMAW flat position welding?
A. 5 mm
B. 10 mm
C. 15 mm
D. 20 mm
What is the purpose of fitting clear glasses on either side of coloured glass in a helmet?
A. Protect from rays
B. Protect from heat
C. Protect from spatters
D. Protect from radiation
How the welder observes welding area of the joint in electron beam welding?
A. Safe optical mirror
B. Safe optical helmet
C. Safe optical hand screen having correct shade
D. Safe optical viewing system containing optical mirror
How to protect from the toxic fumes during welding operation?
A. Wear helmet
B. Use hand screen
C. Use leather apron
D. Use respirator pad
What is the purpose of using copper coated filler wire in MIG / MAG welding?
A. To remove fumes
B. To prevent rust
C. To prevent atmosphere
D. To prevent base metal reaction
What is the angle of inclination of weld torch for flat position in GMAW welding process?
A. 5° – 10°
B. 10° – 15°
C. 15° – 25°
D. 25° – 35°
How many Kgs weight of thermit is required against one Kg of wax?
A. 10 to 15 Kgs
B. 11 to 15 Kgs
C. 12 to 14 Kgs
D. 12 to 16 Kgs
Which is adjusted in electron beam welding to eliminate the defect of porosity?
A. Spot size
B. Deflection
C. Weld penetration
D. Focal position / focus current
What is the limitation for submerged arc welding process?
A. Limited to vertical position
B. Limited to non ferrous metals
C. Limited to over head position
D. Limited to flat and horizontal fillet welds
Which combination of shield gas in GMAW process produce good arc stability for carbon steel?
A. Argon + 20% CO₂
B. CO₂
C. Pure argon
D. Argon + 5% CO₂
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How the filler wire is fed in the GMAW welding process?
A. Manually
B. No feeding
C. Automatically
D. Semi automatic
Which type of electrodes are used in MAG/CO2 welding?
A. Flux coated electrodes
B. Bare wire electrode
C. Flux cored electrodes
D. Tungsten electrode
What is the range of electrode for MAG / CO2 welding?
A. 0.8 to 1.6 mm
B. 0.7 to 1.3 mm
C. 0.6 to 0.9 mm
D. 0.5 to 0.7 mm
What type of operation is generally used in GMAW?
A. Automatic
B. Semi automatic
C. Fully automatic
D. Manual method
Which heat treatment of steel increases hardness, but decreases strength and ductility?
A. Annealing
B. Hardening
C. Normalising
D. Case hardening
Which heat treatment process produces only outer surfaces of job hardened, to some depth?
A. Annealing
B. Hardening
C. Normalising
D. Case hardening
Which heat treatment process is employed to remove brittleness in a chisel?
A. Annealing
B. Hardening
C. Tempering
D. Normalising
What is the main purpose of ‘Normalising’ steel?
A. To control hardness
B. To prevent cracking
C. To make welding operation easier
D. To produce fine grain of uniform structure
Which heat treatment process, if material is softened & suitable for machining?
A. Annealing
B. Tempering
C. Normalising
D. Case hardening
What is the name of heat treatment process where the steel is reheated to a suitable temperature below the critical point (heating) to improve the toughness and ductility?
A. Annealing
B. Hardening
C. Tempering
D. Normalising
Which heat treatment process is very similar to annealing but the job are allowed to cool in air?
A. Hardening
B. Tempering
C. Normalising
D. Case hardening
What type of test is used for vessels, tanks and pipe containing pressure?
A. Visual inspection
B. Leak or pressure test
C. Stethoscopic test
D. Magnetic particle test
What is the NDT method, used to detect surface and subsurface defects on ferrous metals, using iron power?
A. X-ray test
B. Gamma ray test
C. Magnetic particle test
D. Stethoscopic test
What Non-destructive test is done using coloured dye and fluorescent liquid to find minute cracks?
A. Radiographic test
B. Magnetic test
C. Ultrasonic test
D. Liquid penetration test
Which welding process is done by chemical reaction between a metal oxide and metal?
A. Electro slag welding
B. Election beam welding
C. Thermit welding
D. TIG welding
How much time it takes for the thermit mould to cool, after welding by thermit process?
A. 7 Hrs
B. 9 Hrs
C. 10 Hrs
D. 12 Hrs
What is the reason that obstructed joints cannot be welded by electron beam welding process?
A. Electron beam travel in curved line
B. Electron beam travel in different direction
C. Electron beam travel only in straight line
D. Electron beam travel in circular line
How much gas flow rate is required to weld a butt joint with 0.8 mm dia MS filler rod of wire feed rate 3 – 4 m/min at 18 to 20 volts?
A. 6 to 8 Lpm
B. 8 to 10 Lpm
C. 10 to 12 Lpm
D. 12 to 14 Lpm
What should be the initial angle of two plates in a T joint if the final angle between them is 90° after completion of welding?
A. 93°
B. 90°
C. 85°
D. 75°
What is percentage of deposition efficiency in FCAW process?
A. 93% to 97%
B. 80% to 86%
C. 70% to 76%
D. 60% to 67%
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Which gas/mixture is likely to reduce the spatter loss in FCAW?
A. Argon and CO₂ mixed
B. Argon and helium mixed
C. CO₂ and helium mixed
D. Only CO₂ gas
Which metal is welded with self shielded type FCAW?
A. Low alloy steel
B. Stainless steel
C. Carbon steel
D. Different metal and different position
Which combination of metal and shielding gas give excellent cleaning action in GMAW welding process?
A. Copper, Argon
B. Aluminium, Helium
C. Magnesium, Argon
D. Stainless steel Argon
What is basic safety environmental condition for the welding area?
A. Dust free
B. Clean area
C. No congestion
D. Well ventilated
What is the trouble shooting to wire wrapping on drive rolls of wire feeder in GMAW?
A. Adjust drive rolls pressure
B. Replace drive rolls and guides
C. Check drive rolls align properly
D. Replace the drive motor
Which is the remedy for the contraction of weld metal due to excess of heat input that moves the base metal changes the angle?
A. Support on solid surface with two hands
B. Check gas flow rate and leakage of gas
C. Use clean and dry weld wire
D. Weld small segments and allow cooling
What is the operation to clean the cylinder valve before fixing the regulator to the argon cylinder?
A. Closing
B. Opening
C. Shutting
D. Cracking
What defect will occur in the weld metal if the arc voltage and travel speed is low in MIG / MAG welding?
A. Blow hole
B. Under cut
C. Wire struck
D. Weld overlap
What is the effect in MIG / MAG welding for a short stick out distance?
A. Porosity in weldment
B. Arc blow in weldment
C. Less spatter deposit in nozzle
D. More spatter deposit in nozzle
What is the weld defect if wire feed speed too high?
A. Porosity
B. Spatters
C. Incomplete fusion
D. Lack of penetration
Which type of defect is caused if the gas flowing rate is uneven?
A. Porosity
B. Distortion
C. Under cut
D. Incomplete fusion
What is the difficulty in starting of arc in GMAW?
A. Wrong polarity
B. Unsteady hand
C. Work piece dirty
D. Excess of voltage
How to troubleshoot the burn back problem if the contact tip is plugged or worn out?
A. Adjust the contact tip
B. Damaged cable connections
C. Clean and replace contact tip
D. Low voltage and insufficient heat
What do you call a weld joint having small holes/cavities due to entrapped gas packets?
A. Lack of fusion
B. Lack of penetration
C. Spatter
D. Porosity
What is the defect in a weld joint, in which the weld metal melting through base metal resulting in holes?
A. Excessive penetration
B. Lack of penetration
C. Burn through
D. Distortion
What is the name of the welding defect, with weld metal contracting during welding process?
A. Distortion
B. Excessive penetration
C. Lack of penetration
D. Porosity
What is the name of the defect occurring to an unsteady hand in GMAW?
A. Over fusion
B. Burn through
C. Distortion
D. Waviness of bead
What gas combination will reduce spatter defect and improve arc stability in a MIG/MAG welding process?
A. CO₂ / Neon
B. Argon / CO₂
C. Helium CO₂
D. Argon / CO₂ / O₂
What are the types of joint in friction welding?
A. T joint
B. Lap joint
C. Butt joint
D. Corner joint
What is the non-consumable electrode of high melting point used in TIG welding?
A. Carbon electrode
B. Copper electrode
C. Tungsten electrode
D. Aluminium electrode
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What is also referred as a GTAW?
A. TIG welding
B. MIG welding
C. STUD welding
D. GAS welding
What type of metals joined in friction welding?
A. Similar metal
B. Dissimilar metal
C. Non metal group
D. Any metal flat type
What crystal (rod) is used in laser beam welding?
A. Iron
B. Ruby
C. Copper
D. Stainless steel
What type of metal section can be welded by friction welding?
A. Pipe and round rods
B. Flats and square roof
C. Thick sheet
D. Heavy sheet
What is principle of friction welding?
A. One member stationary and another rotating type
B. Both members rotates
C. Both members are heated
D. One member is heated and another rotating
Which welding process does not require the supply of external heat?
A. Seam welding
B. Friction welding
C. Flash butt welding
D. Spot welding
What stage of the metal the friction welding is completed by applying high pressure?
A. Fusion stage
B. Non fusion stage
C. Plastic stage
D. Only heating stage
What is the full form of GTAW?
A. Groove tungsten arc welding
B. Grip tungsten arc welding
C. Gas tungsten arc welding
D. Galvanised tungsten arc welding
What is the angle of electrode tip by setting DCEN for SS welding by TIG welding process?
A. 50°
B. 40°
C. 45°
D. 60°
What is the source of heat in friction welding process?
A. Chemical heating
B. Electrical heating
C. Mechanical friction
D. Thread heating
Which of the following properties of metal will not allow the application of friction welding?
A. Metals with high compressive strength
B. Metals with low compressive strength
C. Metals with high tensile strength
D. Metals with low carbon content
Which welding process is effective for nickel and titanium?
A. Arc welding
B. TIG welding
C. Gas welding
D. MIG welding
Which is the welding process that maintains electric arc between non-consumable tungsten electrode and the base metal?
A. SAW
B. MMAW
C. MIG
D. TIG
What is the name of the defect in which the weld metal did not melt with base metal in TIG process?
A. Porosity
B. Lack of penetration
C. Lack of fusion
D. Under cut
What is the bore dia of ceramic nozzle to avoid porosity while doing TIG, welding?
A. Small sized
B. Large sized
C. Correct sized
D. Too small sized
How to avoid burning fast of tungsten in TIG welding process?
A. Long arc length
B. By using DCEP
C. By not using shielding
D. By using contaminated base metal
Which part the equipment the electron beam is direct and controlled in an electron beam welding process?
A. Electron gun
B. Electron beam
C. Vacuum chamber
D. Atmosphere
What devices are provided to reflect the light coming to the ends of ruby rod in laser beam welding?
A. Laser tube
B. Reflecting mirrors
C. Flash lamps
D. Shutter
Which gas is generally used in gas laser type welding?
A. Carbon – di – oxide
B. Neon gas
C. Argon gas
D. Oxygen
In which welding process the work pieces are melted and jointed by narrow beam of light source?
A. Electron beam welding
B. Laser beam welding
C. Plasma arc welding
D. Micro plasma arc welding
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Which is adjusted in Electron beam welding to eliminate the defect of porosity?
A. Spot size
B. Deflection
C. Weld penetration
D. Focal position / focus current
What is the approximate revolution of rotating member in friction welding process, to effect the weld joint?
A. 1500 rpm
B. 2000 rpm
C. 2500 rpm
D. 3000 rpm
Which gas is inactive or deficient is active chemical properties in TIG welding?
A. Argon
B. Oxygen
C. Hydrogen
D. Acetylene
What is the purpose of inert gas used in TIG welding?
A. Contamination in the weld metal
B. To protect the molten metal from the atmospheric contamination
C. To stabilize the Arc
D. To get more spatters
Which gas is issued as inert gas in GTAW for increased speed?
A. Oxygen
B. Helium
C. Acetylene
D. Hydrogen
How much temperature GTAW process can produce?
A. 3000°F
B. 3500°F
C. 4000°F
D. 4500°F
What is the main source of heat to the workpiece in TIG welding?
A. Cable current
B. By Torch
C. By tube
D. By electrode
How heat effected zone is covered and protected from atmospheric contaminations in GTAW?
A. Argon gas
B. Oxygen gas
C. Fuel gas
D. Active gas
What is the use of a little hydrogen added to argon for welding of stainless steel in GTAW process?
A. Improves heat
B. Improves heat transfer
C. Improves good welding
D. Improves metal property
How molten metal is shielded from the atmospheric contamination as a blanket in GTAW?
A. By using inert gas
B. By using fuel gas
C. By using supportable gas
D. By using fuel and supportable gas
How is the inert gas directed to flow over weld pool, in TIG welding?
A. Through copper nozzle
B. Through brass nozzle
C. Through ceramic nozzle
D. Through metal nozzle
What is the name of the part of TIG torch for holding tungsten electrode?
A. Collet
B. Adaptor
C. Ceramic nozzle
D. Electrode cap
What is the purpose of H.F. unit in TIG welding?
A. To produce the AC
B. To change AC to DC
C. To produce power supply
D. To initiate the arc without touching the electrode on the base metal
Which type of cooling system is used in heavy duty welding operations?
A. Air cooled
B. Oil cooled
C. Gas cooled
D. Water cooled
Which electrode is used in TIG welding process?
A. Zinc electrode
B. Carbon electrode
C. Tungsten
D. Magnesium electrode
What is the device used to show the volume of the inert gas allowed to go to the welding torch in TIG welding?
A. Flow meter
B. CO₂ regulator
C. Pressure meter
D. Argon regulator
Which gas is chemically inactive with any metals in hot or cold condition in TIG welding?
A. Argon
B. Oxygen
C. Nitrogen
D. Hydrogen
Which type of tungsten electrode is suitable for welding of SS by TIG process with DC?
A. Pure tungsten electrode
B. Cerium tungsten electrode
C. Thoriated tungsten electrode
D. Zirconium tungsten electrode
What is the process of replacing the air in a pipe with argon gas that will not react with the root of the weld?
A. Pouring
B. Purging
C. Pre filling
D. Pool weld
Which electrode is used to produce arc in GTAW process?
A. M.S electrode
B. Cast iron electrode
C. Tungsten electrode
D. Stainless steel electrode
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Which will not be present on the weld bead due to use of shielding gas in TIG welding process?
A. Slag
B. Over lap
C. Under cut
D. Penetration
Which process can easily weld thin metal?
A. MIG welding
B. Tungsten arc welding
C. Submerged arc welding
D. Manual metal arc welding
Why argon gas is used in welding of stainless steel welding in TIG welding process?
A. Inert gas protects the weld
B. It helps in melting the electrode
C. It prevents porosity
D. It is cheap
Which welding machine is to be used for welding of aluminium by TIG welding process?
A. AC welding machine
B. DC welding machine
C. AC & DC transformer
D. DC transformer
What is the defect caused by high current in TIG welding?
A. Crack
B. Porosity
C. Under cut
D. Lack of penetration
What is the reason for unstable arc in DC TIG welding process?
A. Improper tungsten size
B. Improper shielding gas flow
C. Improperly prepared tungsten
D. Weld circuit polarity is incorrect
What is the cause for poor weld bead colour in TIG welding process?
A. Too much arc length
B. Excessive heating in torch
C. Tungsten melting into weld puddle
D. Contaminated or improper filler metal
What is the temperature in the weld area plasma arc welding process?
A. 20,000°C to 30,000°C
B. 30,000°C to 35,000°C
C. 15,000°C to 20,000°C
D. 35,000°C to 40,000°C
What material is used to make electrode in spot welding?
A. Iron electrode
B. Copper alloy electrodes
C. Silicon electrodes
D. Cast iron electrodes
Which resistance welding machine is provided with an electrode in wheel shape?
A. Spot welding
B. Seam welding
C. Projection welding
D. Flash butt welding
Which welding process effects weld joints under heavy pressure, with supply cut off?
A. Flash-butt welding
B. Fusion welding
C. Thermit welding
D. Spot welding
Which resistance welding process produces a bulge at weld joint?
A. Flash butt
B. Spot
C. Seam
D. Projection
What is the angle of “off set tip” electrode used in spot welding?
A. 30°
B. 40°
C. 50°
D. 60°
Which electrode is movable in spot welding?
A. Both moved
B. Both not moved
C. Upper electrode
D. Lower electrode
Which electrode is used in plasma arc welding?
A. Cast iron
B. Mild steel
C. Tungsten
D. Stainless steel
Which welding process where a ‘nugget’ is formed in the weld joint?
A. Arc welding
B. Seam welding
C. Spot welding
D. Percussion welding
Which welding process is used to weld stainless steel wire mesh and surgical instruments
A. Electrode beam welding
B. Electro slag welding
C. Micro plasma welding
D. Plasma welding
Which process is used to cut stainless steel metal?
A. Plasma arc cutting process
B. Micro plasma cutting process
C. Key hole plasma process
D. Plasma cutting
Which gas is suitable for welding of stainless steel, nickel alloys by plasma arc welding?
A. Argon
B. Helium
C. Hydrogen
D. Neon
Which gas is suitable for welding of carbon steel and titanium by plasma arc welding process?
A. Helium
B. CO₂
C. Argon
D. Neon
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Which is the process to attain full penetration of weld in 10 mm stainless steel?
A. Laser beam
B. Micro plasma
C. Electron beam
D. Key hole plasma
What is the current range in micro plasma arc welding process?
A. 0.05 to 25 Amps
B. 0.05 to 20 Amps
C. 0.05 to 15 Amps
D. 0.05 to 10 Amps
What is the cause for nugget in spot welding process?
A. Sufficient current
B. Incorrect setting electrode
C. Insufficient electrode diameter
D. Insufficient heating of base metal
Which welding process spot welding is belonging?
A. Gas welding
B. Arc welding
C. Resistance welding
D. Jig welding
Which process cuts the stainless steel, carbon steel with the help of high jet velocity?
A. Plasma arc process
B. Micro plasma cutting process
C. Key hole plasma process
“D. Non-transferred plasma
arc”
What is the purpose of metal build up on the worn out metal parts?
A. To change its dimensions
B. To reduce its shape and properties
C. To make them good and new and obtain require properties
D. To get brightness
What is the wear caused by liquids or gases striking metal parts at high speed?
A. Corrosion
B. Rust
C. Friction
D. Erosion
Which is the process to paint with particles by electro static charging?
A. Metal
B. Powder coating
C. Electro plating
D. Thermal spraying
What is the expanded form of PQR?
A. Procedure Qualification Read
B. Procedure Qualification Response
C. Procedure Quality Record
D. Procedure Qualification Record
What is the expanded form of WPS?
A. Welding Procedure Speed
B. Welding Procedure Separation
C. Welding Procedure Specification
D. Welding Procedure Standards
What is the main aim of welding procedure qualification, in a test to ascertain?
A. Properties of weld withstand and designed conditions
B. Performs of weld withstand designed conditions
C. Perfect of weld withstand all condition
D. Power of weld
What is the code number given for pressure vessel manufacturing, exclusively for steel and steel alloy?
A. P1 to P11
B. P21 to P30
C. P31 to P35
D. P43 to P47
What is the grouping P code number for welding covered under copper and copper based alloys?
A. P1 to P11
B. P21 to P30
C. P31 to P35
D. P43 to P47
Which welding process is more desirable in filling up surfaces of grooves?
A. Shielded metal arc welding method
B. Oxy-acetylene welding method
C. TIG welding method
D. Submerged arc welding method
Which one of the following method is not related to surfacing metal?
A. Oxy-acetylene method
B. Grinding method
C. TIG welding method
D. SAW method
What is the post-heated temperature of plain carbon steel?
A. 100°C to 300°C
B. 350°C to 400°C
C. 400°C to 500°C
D. 500°C to 550°C
What is the purpose of metal build up process, on a worn metal?
A. To repair broken parts
B. To build worn out product made new
C. To make joints
D. To reduce excess weld metal
What should be the electrode angle while building up worn out shaft?
A. 30° – 40°
B. 50° – 60°
C. 70° – 80°
D. 90° – 110°
Which method is suitable for surfacing the metal part and for high quality of weld and high deposition rate?
A. Oxy-acetylene method
B. Manual metal arc welding
C. MIG welding
D. Submerged arc welding
Which method is suitable for surfacing method to have smooth and thin layer?
A. MIG welding
B. Shielded metal arc welding
C. Plasma welding
D. Submerged arc welding
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Which method, surfacing can be done in any position or in any location?
A. Shielded metal arc welding
B. TIG welding
C. MIG welding
D. Submerged arc welding
Which metal surfacing method is ideal for thin layers, which can flow to corner and edges of the job?
A. TIG welding
B. MIG welding
C. Oxy-acetylene welding
D. Submerged arc welding
Which process is suitable and gives independence when there is a shortage of part?
A. It should temperature
B. It should be hard faced
C. It should be heat treated
D. It should be peened
What is the advantage of hard facing ?
A. To increase the labour cost
B. To increase idle time of plant
C. To decrease mechanical efficiency
D. To increase mechanical operating efficiency
Which electrodes are used to resist abrasion for hard facing in MMAW process?
A. Cast iron
B. Mild steel
C. Aluminium
D. Chromium and tungsten carbide
Which format the result of welding qualification is recorded?
A. Procedure Qualification Record (PQR)
B. Welder Procedure Specification (WPS)
C. Welding Procedure Qualification (WPQ)
D. Welder Performance Qualification (WPQ)
Why hard facing is done for worn out parts?
A. To get brittleness
B. To reduce mechanical operating efficiency
C. Instead of new replacement of costly parts
D. To increase labour cost
Which action on metal parts shall deform, fracture or peel off in pieces?
A. Abrasion
B. Erosion
C. Impact load
D. Friction
What action occur while grinding or scratching action of hard particle on metal part?
A. Erosion
B. Abrasion
C. Impact
D. Friction
How does a metal part looks like, if it gets oxidised?
A. Corroded
B. Rusted
C. Abrasion
D. Eroded