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electric traction MCQs

Practise focused electric traction questions with marked answers for exam preparation and subject revision.

electric traction Mcqs

1. Which of the following is the voltage for single phase A.C. system ?
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A. 22 V

B. None of the above

C. 5 kV

D. 440 V

E. 15 kV

2. An ideal traction system should have_______________?
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A. all of the above

B. high starting tractive effort

C. easy speed control

D. equipment capable of with standing large temporary loads

3. Which of the following drives is suitable for mines where explosive gas exists ?
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A. Steam engine

B. Battery locomotive

C. Diesel engine

D. Any of the above

4. The return circuit for tramcars is through_______________?
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A. rails

B. common earthing

C. neutral wire

D. cables

5. Battery operated trucks are used in________________?
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A. factories for material transportation

B. steel mills

C. power stations

D. narrow gauge traction

6. Main traction systems used in India are, those using______________?
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A. electric locomotives

B. steam engine locomotives

C. diesel electric locomotives

D. diesel engine locomotives

E. all of the above

7. The normal value of adhesion friction is______________?
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A. 0.75

B. 0.25

C. 0.12

D. 0.4

8. For diesel locomotives the range of horsepower is_______________?
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A. 50 to 200

B. 500 to 1000

C. 1500 to 2500

D. 3000 to 5000

9. Locomotives with monometer bogies have_________________?
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A. low co-efficient of adhesion

B. uneven distribution of tractive effect

C. lot of skidding

D. suitability for passanger as well as freight service

10. Series motor is not suited for traction duty due to which of the following account ?
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A. Current surges after temporary switching off supply

B. Self relieving property

C. Commutating property at heavy load

D. Less current drain on the heavy load torque

11. The rate of acceleration on suburban orurban services is restricted by the consideration of______________?
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A. Passenger Discomfort

B. Track size

C. Track curves

D. Engine power

12. The wheels of a train, engine as well as bogies, are slightly tapered to_____________?
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A. facilitate in taking turns

B. facilitate braking

C. reduce friction

D. increase friction

13. Quadrilateral speed-time curve pertains to which of the following services ?
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A. Sub-urban service

B. Main line service

C. Urban and sub-urban service

D. Urban service

14. Which of the following is the disadvantage of electric traction over other systems of traction ?
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A. Interference with communication lines

B. All of the above

C. Short time power failure interrupts traffic for hours

D. Corrosion problems in the under-ground pipe work

E. High capital outlay in fixed installations beside route limitation

15. Which of the following is the advantage of electric braking ?
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A. Motor continues to remain loaded during braking

B. It is instantaneous

C. More heat is generated during braking

D. It avoids wear of track

16. Co-efficient of adhesion reduces due to the presence of which of the following ?
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A. Sand on rails

B. Dew on rails

C. Oil on the rails

D. both B. and C.

17. The value of co-efficient of adhesion will be high when rails are_________________?
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A. wet

B. sprayed with oil

C. cleaned with sand

D. greased

18. In case of _________________ free running and coasting periods are generally long ?
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A. main-line service

B. all of the above

C. urban service

D. sub-urban service

19. For 25 kV single phase system power supply frequency is_______________?
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A. 25 Hz

B. 50 Hz

C. 60 Hz

D. 16 Hz

20. For given maximum axle load tractive efforts of AC. locomotive will be_____________?
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A. none of the above

B. more than that of D.C. locomotive

C. equal to that of D.C. locomotive

D. less than that of D.C. locomotive

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