1. Dielectric is used in
A. electro-chemical machining
B. ultra-sonic machining
C. electro-discharge machining
D. laser machining
2. The type of reamer used for reaming soft aluminium or copper, is
A. straight fluted reamer
B. left hand spiral fluted reamer
C. right hand spiral fluted reamer
D. any one of these
3. The tool material, for faster machining, should have
A. wear resistance
B. red hardness
C. toughness
D. all of these
4. The helix angle of a drill is more than 30° for drilling aluminium.
A. Agree
B. Disagree
5. In a single point turning operation with a cemented carbide and steel combination having a Taylor exponent of 0.25, if the cutting speed is halved, then tool life will become
A. half
B. two times
C. eight times
D. sixteen times
6. An open structure of a grinding wheel is used for
A. soft materials
B. tough materials
C. ductile materials
D. all of these
7. A twist drill is specified by its
A. shank, material and diameter
B. shank, lip angle and size of flute
C. material, length of body and helix angle
D. any one of these
8. The hole to be drilled for tapping is __________ the outside diameter of the thread on the tap.
A. equal to
B. smaller than
C. greater than
9. Glazing in grinding wheels takes place when the
A. wheel is too hard or wheel revolves at a very high speed
B. wheel is too soft or wheel revolves at a very slow speed
C. wheel is too hard and wheel revolves at very slow speed
D. wheel is too soft and wheel revolves at a very high speed
10. Low helix angle drills are preferred for drilling holes in
A. plastics
B. copper
C. cast steel
D. carbon steel
11. In which of the following machine, the work remains stationary and the tool is rotated?
A. Vertical boring machine
B. Horizontal boring machine
C. Precision boring machine
D. Jig boring machine
12. The ratio between two consecutive spindle speeds for a six-speed drilling machine using drills of diameter 6.25 to 25 mm size and at a cutting velocity of 18 m/min is
A. 1.02
B. 1.32
C. 1.66
D. 1.82
13. The cutting speed of a drill depends upon the
A. material of drill
B. type of material to be drilled
C. quality of surface finish desired
D. all of these
14. The part of the tool on which cutting edge is formed is called nose.
A. Correct
B. Incorrect
15. The chamfering is an essential operation after
A. knurling
B. rough turning
C. boring
D. thread cutting
16. The broaching operation in which either the work or the tool moves across the other, is known as
A. pull broaching
B. push broaching
C. surface broaching
D. continuous broaching
17. Ultra-sonic machining is best suited for
A. tool steels
B. sintered carbides
C. glass
D. all of these
18. In plunge grinding
A. the work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face
B. the work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face
C. the work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face
D. the work rotates in a fixed position as the wheel feeds to produce cylinders longer than the width of wheel face
19. When the grinding wheel is marked by the letters from I to P, it indicates that the grinding wheel is of hard grade.
A. True
B. False
20. A 15 mm drilling machine means that it can drill a hole
A. maximum diameter 15 mm
B. in 15 mm thick plates
C. having cross-sectional area of 15 mm2
D. none of these