1. A drill bit of 20 mm diameter rotating at 500 r.p.m. with a feed rate of 0.2 mm/revolution is used to drill a through-hole in a mild steel plate 20 mm thickness. The depth of cut in this drilling operation is
A. 0.2 mm
B. 10 mm
C. 20 mm
D. 100 mm
2. The tail stock and the carriage of a lathe may be guided on same or different guideway.
A. True
B. False
3. In order to achieve a specific surface finish in single point turning, the most important factor to be controlled is
A. depth of cut
B. cutting speed
C. feed
D. tool rake angle
4. Surface grinding is done to produce
A. tapered surface
B. flat surface
C. internal cylindrical holes
D. all of these
5. Gear finishing operation is called
A. shaping
B. milling
C. hobbing
D. burnishing
6. The tool life is said to be over if
A. poor surface finish is obtained
B. there is sudden increase in cutting forces and power consumption
C. overheating and fuming due to heat of friction starts
D. all of the above
7. Continuous chips with built up edge are formed during machining of
A. brittle metals
B. ductile metals
C. hard metals
D. soft metals
8. The rate of removing metal is __________ by increasing the depth of cut.
A. decreased
B. increased
9. The method of grinding used to produce internal cylindrical holes and tapers, is
A. internal cylindrical grinding
B. form grinding
C. external cylindrical grinding
D. surface grinding
10. The tool life is __________ cutting speed.
A. independent of
B. dependant upon
11. For machining a cast iron workpiece by a high speed steel tool, the average cutting speed is
A. 10 m/min
B. 15 m/min
C. 22 m/min
D. 30 m/min
12. The vector sum of cutting velocity and chip velocity is __________ shear velocity.
A. equal to
B. less than
C. more than
13. For harder alloy steel, the point angle of the drill is kept
A. equal to 118°
B. less than 118°
C. more than 118°
D. any one of these
14. An open structure of a grinding wheel is denoted by the number 1 to 8.
A. Correct
B. Incorrect
15. In an orthogonal cutting, the depth of cut is halved and the feed rate is double. If the chip thickness ratio is unaffected with the changed cutting conditions, the actual chip thickness will be
A. doubled
B. halved
C. quadrupled
D. unchanged
16. For turning small taper on long workpiece, the suitable method is
A. by a form tool
B. by setting over the tail stock
C. by a taper turning attachment
D. by swivelling the compound rest
17. In a milling operation, two side milling cutters are mounted with a desired distance between them so that both sides of a workpiece can be milled simultaneously. This set up is called
A. gang milling
B. straddle milling
C. string milling
D. side milling
18. The time (in minutes) for a drilling a hole is given by t=Depth of hole+h/FeedxR.P.M where h is the
A. length of the drill
B. drill diameter
C. flute length of the drill
D. cone height of the drill
19. Crack in grinding wheel is developed due to
A. high temperature developed at the contact of the wheel face and work
B. grinding hard work
C. low speed of wheel
D. high speed of wheel
20. The average cutting speed for turning mild steel with a high speed steel tool is
A. 15 to 19 m/min
B. 25 to 31 m/min
C. 60 to 90 m/min
D. 90 to 120 m/min