41. Internal or external threads of different pitches can be produced by
A. pantograph milling machine
B. profiling machine
C. planetary milling machine
D. piano-miller
42. In a shaper
A. tool is stationary and work reciprocates
B. work is stationary and tool reciprocates
C. tool moves over stationary work
D. tool moves over reciprocating work
43. Which of the following statement is correct about EDM machining?
A. It can machine hardest materials.
B. It produces high degree of surface finish.
C. The tool and work are never in contact with each other.
D. all of these
44. Spot facing is an operation of smoothing and squaring the surface around a hole.
A. True
B. False
45. A better machinable metal is one which gives
A. lower chip-tool contact area and larger shear angle
B. higher chip-tool contact area and smaller shear angle
C. lower chip-tool contact area and smaller shear angle
D. higher chip-tool contact area and larger shear angle
46. The angle between the lathe centres is
A. 30°
B. 45°
C. 60°
D. 90°
47. When the shear angle is large
A. path of shear is short and chip is thin
B. path of shear is large and chip is thick
C. path of shear is short and chip is thick
D. path of shear is large and chip is thin
48. The correct sequence of the following parameters in order of their maximum to minimum influence on tool life is
A. feed rate, depth of cut, cutting speed
B. depth of cut, cutting speed, feed rate
C. cutting speed, feed rate, depth of cut
D. feed rate, cutting speed, depth of cut
49. In drilling aluminium, a drill with
A. zero helix angle is used
B. low helix angle is used
C. high helix angle is used
D. any helix angle can be used
50. Ceramic cutting tools are
A. made by cold pressing of aluminium oxide powder
B. available in the form of tips
C. brittle and have low bending strength
D. all of these