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49.

Applications in which stresses are encountered in one direction only uses following type of threads

A.	metric	B.	buttress
C.	acme	D.	square

50.

At low temperatures (say 75°C) the notched-bar impact value of steel

A.	increases markedly	B.	decreases markedly
C.	remains same	D.	depends on heat treatment carried out

51.

Ball bearing type screws are found in following application

A.	screw jack	B.	aeroplane engines
C.	crane	D.	steering mechanism

52.

Brittle coating technique is used for

A.	determining brittleness	B.	protecting metal against corrosion
C.	protecting metal against wear and tear	D.	experimental stress analysis

53.

Cap screws are

A.	similar to small size tap bolts except that a greater variety of shapes of heads are available	B.	slotted for a screw driver and generally used with a nut
C.	used to prevent relative motion be-tween parts	D.	provided with detachable caps

54.

Castle nut is a locking device in which

A.	one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming	B.	a slot is cut partly is middle of nut and then slot reduced by tightening a screw
C.	a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip	D.	through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end

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