⚡Electrical Engineering MCQs
Electrical Engineering MCQs
499 MCQs51
Series motor is not suited for traction duty due to which of the following account ?
ALess current drain on the heavy load torque
BCurrent surges after temporary switching off supply
CSelf relieving property
DCommutating property at heavy load
52
The resistance encountered by a train in motion is on account of_________________?
Aresistance offered by air
Bfriction at the track
Cfriction at various parts of the rolling stock
Dall of the above
53
Battery operated trucks are used in________________?
Asteel mills
Bpower stations
Cnarrow gauge traction
Dfactories for material transportation
54
Vacuum is created by which of the following ?
AVacuum pump
BEjector
CAny of the above
DNone of the above
55
_______________method can bring the locomotive to dead stop?
APlugging braking
BRheostatic braking
CRegenerative braking
DNone of the above
56
The voltage used for suburban trains in D.C. system is usually_______________?
A12 V
B24 V
C220 V
D600 to 750 V
57
Specific energy consumption becomes________________?
Amore on steeper gradient
Bmore with high train resistance
Cless if distance between stops is more
Dall of the above
58
The value of co-efficient of adhesion will be high when rails are_________________?
Agreased
Bwet
Csprayed with oil
Dcleaned with sand
59
For three-phase induction motors which of the following is the least efficient method of speed control ?
ACascade control
BPole changing
CRheostat control
DCombination of cascade and pole changing
60
Which of the following motors is usually preferred for kiln drives ?
AC. motor
BSlip ring induction motor
CThree phase shunt wound com-mutator motor
DAny of the above