41. The enlarging of an existing circular hole with a rotating single point tool is called
A. boring
B. drilling
C. reaming
D. internal turning
42. In the relation VTn = C, the value of n for high speed steel tools varies from 0.25 to 0.40.
A. Agree
B. Disagree
43. Glazing in grinding wheels __________ cutting capacity.
A. has no effect on
B. increase
C. decrease
44. The usual value of the helix angle of a drill is
A. 20°
B. 30°
C. 45°
D. 60°
45. The cutting speed for counter-boring should be __________ that of drilling operation.
A.equal to
B.less than
C.greater than
46. In drilling mild steel and brass, the point angle of a drill is 118°.
A. True
B. False
47. The tail stock set over method of taper turning is preferred for
A. internal tapers
B. small tapers
C. long slender tapers
D. steep tapers
48. The chuck preferred for quick setting and accurate centering of a job is
A. four jaw independent chuck
B. collect chuck
C. three jaw universal chuck
D. magnetic chuck
49. Negative rakes are used for
A. carbide tools
B. heavy loads
C. harder materials
D. all of these
50. A bottoming tap has
A. its end tapered for about three or four threads
B. its end tapered for about eight or ten threads
C. full threads for the whole of its length
D. none of the above
51. The effect of setting a boring tool above centre height leads to
A. increase in the effective rake angle and a decrease in the effective clearance angle
B. increase in both effective rake angle and effective clearance angle
C. decrease in the effective rake angle and an increase in the effective clearance angle
D. decrease in both effective rake angle and effective clearance angle
52. Which of the following statement is correct about nose radius?
A. It improves tool life
B. It improves the surface finish
C. both (a) and (b)
D. none of these
53. The cutting speed for drilling __________ with high speed steel drills is 24 to 45 m/min.
A. mild steel
B. copper
C. aluminium
D. brass
54. In a centre lathe, the cutting tool is fed in __________ with reference to the lathe axis.
A. cross direction only
B. longitudinal direction only
C. both cross and longitudinal direction
D. any direction
55. The angle between the face of the tool and a line tangent to the machined surface at the cutting point is called cutting angle.
A. Correct
B. Incorrect
56. The dressing and truing of grinding wheel are done with the same tools but not for the same purpose.
A. Agree
B. Disagree
57. The point angle of a drill, for drilling stainless steel, is
A. 90°
B. 118°
C. 135°
D. 150°
58. A numerical method of identification of tool is known as tool signature.
A. Correct
B. Incorrect
59. Tumbler gears in lathe are used to
A. reduce the spindle speed
B. cut gears
C. give desired direction of movement to the lathe carriage
D. drill a workpiece