A. easy speed control
B. high starting tractive effort
C. equipment capable of with standing large temporary loads
D. all of the above
Related Mcqs:
- Which of the following is an advantage of electric traction over other methods of traction ?
A. Faster acceleration
B. No pollution problems
C. Better braking action
D. All of the above - Which of the following is the disadvantage of electric traction over other systems of traction ?
A. Corrosion problems in the under-ground pipe work
B. Short time power failure interrupts traffic for hours
C. High capital outlay in fixed installations beside route limitation
D. Interference with communication lines
C. All of the above - Main traction systems used in India are, those using______________?
A. electric locomotives
B. diesel engine locomotives
C. steam engine locomotives
D. diesel electric locomotives
E. all of the above - Series motor is not suited for traction duty due to which of the following account ?
A. Less current drain on the heavy load torque
B. Current surges after temporary switching off supply
C. Self relieving property
D. Commutating property at heavy load - ________________ frequency is not common in low frequency traction system?
A. 40 Hz
B. 25 Hz
C. 16 Hz
D. non of these - Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction ?
A. Reduced current method
B. Tap changing control of transformer
C. Series parallel operation of motors
D. All of the above - Which of the following motors is preferred for traction work ?
A. Universal motor
B. D.C. series motor
C. Synchronous motor
D. Three-phase induction motor - Internal resistance of ideal voltage source is ?
A. zero
B. infinite
C. finite
D. 100 ohms - Internal resistance of ideal current source is ?
A. zero
B. infinite
C. finite
B. 100 ohms - An ideal value of stability factor is________________?
A. 100
B. 200
C. More than 200
D. 1
