A. Vacuum pump
B. Ejector
C. Any of the above
D. None of the above
Related Mcqs:
- Electric force between two point charges in air or vacuum is F. If we replace air or vacuum by an insulator (dielectric) of relative permitivity Cr the force between the charges will_______________?
A. decrease
B. increase
C. remain constant
D. depends upon composition of dielectric - 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 is the voltage for single phase A.C. system ?
A. 22 V
B. 440 V
C. 5 kV
D. 15 kV
E. None 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 - 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 - 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 - 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 - If the co-efficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails ?
A. 0.3
B. 0.26
C. 0.225
D. 0.16
