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21.

Steady rest is

A.	An additional support provided for long jobs	B.	Used while turning unsymmetrical objects
C.	Used during thready cutting only	D.	Used when a lathe is subject to vibrations
E.	Used when a lathe is not provided with foundations

22.

Shanks of taper drills are provided standard taper known as

23.

Which one of the following methods be used for turning internal tapers only?

24.

A mandrel is

A.	A slightly tapered hardened steel shaft that supports works which cannot be supported otherwise	B.	A tapered gauge used for inspection of tapered holes
C.	Auxiliary chuck used on lathe for holding small loads	D.	Is used in lathe work to hold castings
E.	None of above

25.

Marform is

A.	A darwing process that forms metal sheet by using a movable steel punch and a rubber headed ram	B.	Is a foming process on lathe in which movement of tool is neither governed by cross slide nor by compound slide
C.	Is a forming tool and on lathe machine to generate spherical surfaces	D.	A work holding device in which plane of rotation can be changed while working
E.	Is a gauge used to check regular surfaces

26.

Miter gears are

A.	Spur gears of equal diameter and pitch	B.	Helical gears of same module
C.	Right angled bevel gears having the same number of teeth	D.	Gears of different modules
E.	None of above

27.

Music wire

A.	Is fine wire used in musical instruments manufacture springs	B.	Is a carbon steel wire used to manufacture springs
C.	Is a resistance wire used in instruments	D.	Is a standard wire for gauge determination
E.	None of above

28.

In a centre lathe gear box for changing spindle speeds the provision for speeds is made in

29.

In a lathe gear box if first four consecutive speed are 19, 30, 47, 74 rpm, the next speed would be

30.

In a drilling machine having six spindle speeds if first five speeds are 458, 605, 800, 1055 and 1390 rpm, the next higher speed would be