A. Three phase A.C. is converted into D.C.
B. Single phase A.C. is converted into D.C.
C. Single phase supply is converted into three phase system
D. None of the above
Related Mcqs:
- Which of the following happens when star-delta starter is used ?
A. Starting voltage is reduced
B. Starting current is reduced
C. Both A. and B.
D. None of the above - If R1 is in series with parallel connected to R2 and R3, what happens to total current if R2 opens?
A. cannot tell
B. remains the same
C. increases
D. decreases - 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 state capitals is not on broad gauge track ?
A. Lucknow
B. Bhopal
C. Jaipur
D. Chandigarh - Which of the following drives is suitable for mines where explosive gas exists ?
A. Steam engine
B. Diesel engine
C. Battery locomotive
D. Any of the above - Which of the following is the advantage of electric braking ?
A. It avoids wear of track
B. Motor continues to remain loaded during braking
C. It is instantaneous
D. More heat is generated during braking - 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 - The specific energy consumption of a train depends on which of the following ?
A. Acceleration and retardation
B. Gradient
C. Distance covered
D. All of the above - Which of the following braking systems is used on steam locomotives ?
A. Hydraulic system
B. Pneumatic system
C. Vacuum system
D. None of the above - Energy consumption in propelling the train is required for which of the following?
A. Work against the resistance to motion
B. Work against gravity while moving up the gradient
C. Acceleration
D. All of the above
