A. distance between the stops is more
B. maximum speed reached is high
C. acceleration and retardation rates are low
D. all of the above
0
For three-phase induction motors which of the following is the least efficient method of speed control ?
0
The value of co-efficient of adhesion will be high when rails are_________________?
A. Cascade control
B. Pole changing
C. Rheostat control
D. Combination of cascade and pole changing
0
Specific energy consumption becomes________________?
A. greased
B. wet
C. sprayed with oil
D. cleaned with sand
0
The voltage used for suburban trains in D.C. system is usually_______________?
A. more on steeper gradient
B. more with high train resistance
C. less if distance between stops is more
D. all of the above
0
_______________method can bring the locomotive to dead stop?
A. 12 V
B. 24 V
C. 220 V
D. 600 to 750 V
0
Vacuum is created by which of the following ?
A. Plugging braking
B. Rheostatic braking
C. Regenerative braking
D. None of the above
0
Battery operated trucks are used in________________?
A. Vacuum pump
B. Ejector
C. Any of the above
D. None of the above
0
The resistance encountered by a train in motion is on account of_________________?
A. steel mills
B. power stations
C. narrow gauge traction
D. factories for material transportation
0
Series motor is not suited for traction duty due to which of the following account ?
A. resistance offered by air
B. friction at the track
C. friction at various parts of the rolling stock
D. all of the above
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