41. Discontinuous chips are formed during machining of
A. brittle metals
B. ductile metals
C. hard metals
D. soft metals

42. A drill mainly used in drilling brass, copper or softer materials, is
A. flat drill
B. straight fluted drill
C. parallel shank twist drill
D. tapered shank twist drill

43. In a planer
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

44. Which of the following operation is first performed?
A. Spot facing
B. Boring
C. Tapping
D. Drilling

45. The size of a lathe is specified by the
A. length between centres
B. swing diameter over the bed
C. swing diameter over the carriage
D. all of these

46. If the cutting speed is increased, then the built-up-edge
A. becomes longer
B. may or may not form
C. becomes smaller and finally does not form at all
D. has nothing to do with speed

47. For machining a mild steel workpiece by a high speed steel tool, the average cutting speed is
A. 5 m/min
B. 10 m/min
C. 15 m/min
D. 30 m/min

48. Tool signature consists of __________ elements.
A. two
B. four
C. five
D. seven

49. The negative rake is usually provided on
A. high carbon steel tools
B. high speed steel tools
C. cemented carbide tools
D. all of these

50. The tool life is affected by
A. depth of cut
B. cutting speed
C. feed
D. all of these