21. The tap used to cut threads in a blind hole is
A. taper tap
B. second tap
C. bottoming tap
D. any one of these
22. A jig is defined as a device which
A. holds and locates a workpiece and guides and controls one or more cutting tools
B. holds and locates a workpiece during an inspection or for a manufacturing operation
C. is used to check the accuracy of workpiece
D. all of the above
23. A mandrel is used to hold
A. an eccentric work
B. a heavy work
C. a thin work
D. none of these
24. Jigs are used
A. for holding and guiding the tool in drilling, reaming or tapping operations
B. for holding the work in milling, grinding, planing or turning operations
C. to check the accuracy of workpiece
D. none of the above
25. The swing diameter over carriage is always less than the swing diameter over bed.
A. Yes
B. No
26. The size of abrasive grain required in a grinding wheel depends upon the
A. amount of material to be removed
B. hardness of material being ground
C. finish desired
D. all of these
27. A grinding wheel is said to be of __________ if it holds the abrasive grains more securely.
A. soft grade
B. medium grade
C. hard grade
28. A dense structure of a grinding wheel is used for
A. hard materials
B. brittle materials
C. fnishing cuts
D. all of these
29. The keyways, grooves and slots cannot be cut on a shaper.
A. True
B. False
30. Side relief angle of a single point tool is the angle
A. by which the face of the tool is inclined towards back
B. by which the face of the tool is inclined sideways
C. between the surface of the flank immediately below the point and a plane at right angles to the centre line of the point of tool
D. between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base
31. Gears can be best produced on mass production by
A. shaping
B. casting
C. forming
D. hobbing
32. In a plain milling machine, the table can be moved
A. longitudinally
B. crosswise
C. vertically
D. all of these
33. In drilling operation, the metal is removed by
A. shearing
B. extrusion
C. shearing and extrusion
D. shearing and compression
34. A single point tool has
A. rake angle
B. cutting angle
C. lip angle
D. all of these
35. In hot machining, the work is heated by
A. simple heating
B. flame heating
C. induction heating
D. any one of these
36. The type of tool used on milling machine and broaching machine is
A. single point cutting tool
B. two point cutting tool
C. three point cutting tool
D. multi-point cutting tool
37. Which of the following statement is correct for oblique cutting system?
A. The cutting edge is inclined at an angle less than 90° with the normal to the velocity of the tool.
B. Frequently, more than one cutting edges are in action.
C. The chip flows on the tool face at an angle less than 90° with the normal on the cutting edge.
D. all of the above
38. When the tool moves parallel to the lathe axis, the movement is termed as
A. cross feed
B. angular feed
C. longitudinal feed
D. any one of these
39. In the relation VTn = C, the value of n for ceramic tools is
A. 0.1 to 0.2
B. 0.20 to 0.25
C. 0.25 to 0.40
D. 0.40 to 0.55
40. Chip breakers are used to
A. increase tool life
B. remove chips from bed
C. break the chips into short segments
D. to minimise heat generation