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51.

In case of skip hoists, the band-type brake is generally used for

A.	small hoists for light duty	B.	small hoists for heavy duty
C.	large hoists for light duty	D.	large hoists for heavy duty

52.

In case of skip hoists, the hoisting speed generally ranges from

A.	1 to 5 m/s	B.	6 to 15 m/s
C.	20 to 30 m/s	D.	30 to 50 m/s

53.

The size of electric motor depends on

A.	hoisting speed	B.	weight of load
C.	period of acceleration and retardation	D.	all of the above

54.

Electric motor used for skip hoists may be

A.	dc motor	B.	Slip ring type induction motor
C.	Ward Leonard system	D.	Any of the above

55.

In case of skip hoists, complete control of speed from standstill to maximum for all values of load from maximum positive to maximum negative is obtainable while using

A.	dc series motor	B.	dc compound motor
C.	Ward Leonard system of control	D.	Slip ring induction motor

56.

Escalators have the advantage of

A.	continuity of motion	B.	greater capacity
C.	small space requirement	D.	all of the above

57.

In case of excalators, the angle of incline from horizontal is

A.	10?	B.	15?
C.	30?	D.	45?

58.

The normal speed on escalator is around

A.	0.45 m/s	B.	1 m/s
C.	2.5 m/s	D.	9.8 m/s

59.

The normal capacity of a one metre escalator is around

A.	1000 passengers per hour	B.	2000 to 3000 passengers per hour
C.	5000 to 6000 passengers per hour	D.	8000 to 10000 passengers per hour

60.

Which of the following device is used for dragging the material?

A.	Skip hoists	B.	Bucket elevators
C.	Winches	D.	Escalators