electrical engineering MCQs – Page 362

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

electrical engineering Mcqs
1. economics of power generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
7221. The return circuit for tramcars is through_______________?
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A. rails

B. common earthing

C. neutral wire

D. cables

7222. 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

7223. 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
7224. The normal value of adhesion friction is______________?
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A. 0.75

B. 0.25

C. 0.12

D. 0.4

7225. 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

7226. 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
7227. 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

7228. 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

7229. 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

7230. 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

7231. 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
7232. 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
7233. 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.
7234. 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

7235. 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

7236. 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

7237. 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

7238. Which of the following is an advantage of electric traction over other methods of traction ?
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A. Faster acceleration

B. Better braking action

C. No pollution problems

D. All of the above

7239. The resistance encountered by a train in motion is on account of_________________?
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A. friction at various parts of the rolling stock

B. resistance offered by air

C. friction at the track

D. all of the above
7240. The voltage used for suburban trains in D.C. system is usually_______________?
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A. 24 V

B. 600 to 750 V

C. 12 V

D. 220 V