41. The main purpose of a boring operation, as compared to drilling, is to
A. drill a hole
B. finish the drilled hole
C. correct the hole
D. enlarge the existing hole
42. Carbide tipped tools usually have
A. negative rake angle
B. positive rake angle
C. any rake angle
D. no rake angle
43. Gear burnishing is a process for
A. surface finishing
B. under-cut gears
C. cycloidal gears
D. removing residual stresses from teeth roots
44. The continuous chips are in the form of long coils having the same thickness throughout.
A. Agree
B. Disagree
45. The saw milling is an operation of
A. producing grooves around the periphery of a cylindrical or conical workpiece
B. producing narrow slots or grooves on a workpiece
C. reproduction of an outline of a template on a workpiece
D. machining several surfaces of a workpiece simultaneously
46. The high cutting speed and large rake angle of the tool will result in the formation of
A. continuous chips
B. discontinuous chip
C. continuous chips with built up edge
D. none of these
47. Cutting fluid has no effect on the tool life.
A. True
B. False
48. The chisel edge angle of a drill is usually 120° to 135°.
A. Correct
B. Incorrect
49. The cutting speed of a drill varies from point to point on the cutting edge of the drill.
A. Correct
B. Incorrect
50. In oblique cutting system, the maximum chip thickness
A. occurs at the middle
B. may not occur at the middle
C. depends upon the material of the tool
D. depends upon the geometry of the tool