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.Management Sciences
Category: Electric Traction
The pulsating torque exerted by steam locomotives causes which of the following ?
A. Jolting and skidding
B. Hammer blow
C. Pitching
D. All of the above
For three-phase induction motors which of the following is the least efficient method of speed control ?
A. Cascade control
B. Pole changing
C. Rheostat control
D. Combination of cascade and pole changing
Specific energy consumption is affected by which of the following factors ?
A. Retardation and acceleration values
B. Gradient
C. Distance between stops
D. All of the above
The rate of acceleration on suburban orurban services is restricted by the consideration of______________?
A. Engine power
B. Track curves
C. Passenger Discomfort
D. Track size
Locomotives with monometer bogies have_________________?
A. uneven distribution of tractive effect
B. suitability for passanger as well as freight service
C. lot of skidding
D. low co-efficient of adhesion
Co-efficient of adhesion is________________-?
A. high in case of D.C. traction than in the case of AC. traction
B. low in case of D.C. traction than in the case of AC. traction
C. equal in both AC. and D.C. traction
D. any of the above
In tramways which of the following motors is used ?
A. D.C. shunt motor
B. D.C. series motor
C. A.C. three phase motor
D. AC. single phase capacitor start motor
Vacuum is created by which of the following ?
A. Vacuum pump
B. Ejector
C. Any of the above
D. None of the above
The resistance encountered by a train in motion is on account of_________________?
A. resistance offered by air
B. friction at the track
C. friction at various parts of the rolling stock
D. all of the above
The speed of a locomotive is controlled by_______________?
A. flywheel
B. gear box
C. applying brakes 11.
D. regulating steam flow to engine
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