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71.

The adjustment of rails is usually needed when creep exceeds

A.	50 mm	B.	100 mm
C.	150 mm	D.	none of these

72.

The flow of rail metal due to abnormally heavy loads is called

A.	hogging	B.	buckling
C.	wear of rails	D.	creeping

73.

In India, permissible limit of rail wear is

A.	5%	B.	10%
C.	25%	D.	30%

74.

When a train passes on curves which have no superelevation, it will give thrust on the

A.	inner rail	B.	outer rail
C.	inner side of inner rail	D.	inner side of outer rail

75.

When the train moves on the rail, it causes constant reversal of stresses.

Right

Wrong

76.

A good sleeper whould be such that

A.	the rails can be easily fixed and taekn out from the sleeper without moving them	B.	it can provide sufficient bearing area for the rail
C.	it can provide sufficient effective bearing area on the balast	D.	all of the above

77.

The chief function of sleepers is to

A.	support the rails	B.	keep the two rails at correct gauge
C.	distribute the load coming on rails to the ballast	D.	all of the above

78.

The wooden sleepers are the ideal sleepers

Yes

79.

Sleepers which satisfy all of the requirements and are only suitable for track circuiting are

A.	wooden sleepers	B.	steel sleepers
C.	cast iron sleepers	D.	R.C.C. sleepers

80.

The life of wooden sleepers depends upon

A.	quality of the timber used	B.	ability to wear decay
C.	resistance to white ants	D.	all of these