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
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 - 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 - 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 - An ideal traction system should have_______________?
A. easy speed control
B. high starting tractive effort
C. equipment capable of with standing large temporary loads
D. all of the above - ________________ frequency is not common in low frequency traction system?
A. 40 Hz
B. 25 Hz
C. 16 Hz
D. non of these - The electric charge of 100 °C is 13cm apart from another charge 16.9°C electric force between them is_____________?
A. 9x107N
B. 900N
C. 9x105N
D. 9x106N - The disadvantage of voltage divider bias is that it has _________________?
A. High stability factor
B. Low base current
C. Many resistors
D. None of the above - The disadvantage of base resistor method of transistor biasing is that it_________________?
A. Is complicated
B. Is sensitive to changes in ß
C. Provides high stability
D. None of the above
