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37.

Flexible coupling is used because

A.	it is easy to disassemble	B.	it is easy to engage and disengage
C.	it transmits shocks gradually	D.	it prevents shock transmission and eliminates stress reversals

38.

Governor is used in automobile to

A.	decrease the variation of speed	B.	to control
C.	to control SN	D.	all of the above

39.

Hart mechanism has

A.	eight links	B.	six links
C.	four links	D.	twelve links

40.

Higher pairs are those which have

A.	point or line contact between the two elements when in motion	B.	surface contact between the two elements when in motion
C.	elements of pairs not held together mechanically	D.	two elements that permit relative motion

41.

Idler pulley is used

A.	for changing the direction of motion of the belt	B.	for applying tension
C.	for increasing -velocity ratio	D.	all of the above

42.

If D1 and D2 be the diameters of driver and driven pulleys, then belt speed is proportional to

A.	D1/D2	B.	D2/D1
C.	D1-D2.	D.	D1

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