386. Lathe spindle has got
A.Internal threads
B.External threads
C.Taper threads
D.No threads
387. Which of the following lathe operations requires that the cutting edge of a tool bit be placed exactly on the work centre-line?
A.Boring
B.Drilling
C.Facing
D.Turning
388. Lathe centres are provided with the following standard taper
A.Morse
B.British
C.Metric
D.Sharpe
389. Brown and sharp taper is generally used in
A.Lathes
B.Milling machines
C.Shapers
D.Drills
390. On screw machines having cross and vertical slides, cutting off operations are usually performed by the
A.Horizontal slide
B.Vertical slide
C.Cross-slide
D.Cross-drilling attachment
391. Internal or external tapers on a turret lathe can be turned by
A.Face turning attachment
B.Taper turning attachment
C.Sliding attachment
D.Morse taper attachment
392. In order to turn taper on length l with two end diameters d1 and d2 set over the tail stock stover required is
A.d1-d2
B.(d1-d2)/2
C.(d1-d2)/2l
D.(d1-d2)/l
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