Engineering :: Materials Handling

@ : Home > Mechanical Engineering > Materials Handling

181.

The expected life of aerial transport system (rope way or cable way) is usually

A.	1 year	B.	2 to 3 years
C.	5 years	D.	20 years

182.

The handling capacity of a drag line having buckets of one cubic metre capacity is expected to be highest in case of

A.	light moist clay	B.	sand or gravel
C.	clay, wet sticky	D.	clay, hard tough

183.

The advantage of electric braking is

A.	it is instantaneous	B.	More heat is generated during braking
C.	it avoids wear to track	D.	motor continues to remain loaded during braking

184.

In case of locomotion, the coefficient of adhesion is highest when

A.	the rails are dry	B.	the rails are oiled
C.	the rails are wet	D.	the rails are dusty

185.

In case of electric traction, power supply frequency for 25 kV single phase system is

A.	16? Hz	B.	25 Hz
C.	50 Hz	D.	60 Hz

186.

The method of speed control used on 25 kV, 50 Hz single phase traction is

A.	tap changing control of transformer	B.	reduced current method
C.	series parallel operation of motors	D.	Any of the above

187.

The overall efficiency of steam locomotive system is

A.	5 to 10 percent	B.	15 to 25 percent
C.	25 to 35 percent	D.	35 to 45 percent

188.

The pressure of steam in a steam locomotive system is

A.	10 to 15 kg/cm2	B.	20 to 30 kg/cm2
C.	70 to 90 kg/cm2	D.	115 to 125 kg/cm2

189.

The efficiency of diesel locomotive is in the range

A.	10 to 15 percent	B.	20 to 30 percent
C.	40 to 50 percent	D.	60 to 70 percent

190.

The overload capacity of a diesel engine is around

A.	1 percent	B.	10 percent
C.	25 percent	D.	50 percent