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21.

The included angle in Acme threads is

22.

The included angle of American National threads is

23.

A double start screw has

A.	Two threads per inch	B.	Fine threads
C.	Coarse threads	D.	Two threads at some phase angle
E.	None of the above

24.

A coarse scres of major diameter 6 mm is designated as

25.

Machines screws are

A.	Screws with rounded head	B.	Screws with button-head
C.	Provided with slotted head and used with a nut	D.	Headless
E.	Generally provided with head longer than that of a normal screw

26.

The crest diameter of a screw thread is same as

27.

On a triple thread screw

28.

Setscrews are

A.	Small screws	B.	Headless screws
C.	Used to prevent relative motion between parts	D.	Self hreading
E.	Used on sheet metals only

29.

Cap screws are

A.	Used on sheet metal work only and are generally self-threading type	B.	Used by welding to the structure for relative location of parts
C.	Similar to small size bolts except that a great variety of shades of heads are available	D.	Unsed in furniture work only
E.	Generally nickel plated and used where external show is important

30.

In a bolt the plane of shear

A.	Should be across threaded portion of the shank	B.	Should never be acress threaded portion of the shank
C.	Should be parallel to the axis of bolt	D.	Should be normal so the threaded portion of the shank
E.	None of the above