electrical engineering MCQs – Page 68

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 Review each marked answer and report any item that may be outdated or unclear.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
1341. Which of the following equipment provides fluctuating load?
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A. Lathe machine

B. Exhaust fan

C. All of the above

D. Welding transformer
1342. _________offers the highest electric load.
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A. Vacuum cleaner

B. Washing machine

C. Television set

D. Toaster
1343. In a distribution system, in order to improve power factor, the synchronous capacitors are installed__________?
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A. none of the above

B. at the sending end

C. either A. or (b)

D. at the receiving end
1344. Load factor of a power station is generally___________?
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A. less than unity

B. equal to unity

C. equal to zero Diversity factor is always

D. more than unity

1345. The best place to install a capacitor is___________?
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A. any where

B. far away from the inductive load

C. very near to inductive load

D. across the terminals of the inductive load
1346. For the same cylinder dimensions and speed, which of the following engine will produce least power?
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A. Diesel engine

B. Petrol engine

C. Supercharged engine

D. All of the above engines will equal power

1347. A synchronous condenser is virtually which of the following?
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A. Over excited synchronous motor

B. Under excited synchronous motor

C. D.C. generator

D. Induction motor

1348. In which of the following motors the stator and rotor magnetic field rotate at the same speed?
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A. Universal motor

B. Synchronous motor

C. Induction motor

D. Reluctance motor

1349. An ideal voltage source should have______________?
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A. small value of e.m.f.

B. infinite source resistance

C. large value of e.m.f.

D. zero source resistance
1350. For high value of diversity factor, a power station of given installed capacity will be in a position to supply?
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A. neither A. nor B.

B. more number of consumers

C. less number of consumers

D. either A. or B.

1351. Electrical power output in a D.C. generator is equal to_____________?
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A. Mechanical power input iron and friction losses copper losses

B. Electrical power developed in armature copper losses

C. Mechanical power input iron and friction losses

D. Electrical power developed in armature iron and copper losses

1352. Kirchhoff s law is applicable to____________?
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A. passive networks only

B. a.c. circuits only

C. d.c. circuits only

D. both a.c. as well d.c. circuits
1353. A synchronous motor is running on a load with normal excitation. Now if the load on the motor is increased
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A. power factor as well as armature current will decrease

B. power factor will increase but armature current will decrease

C. power factor will decrease and armature current will increase

D. power factor as well as armature current will increase

1354. If excitation of a synchronous motor running with a constant load is decreased from its normal value, ignoring effects of armature reaction, it leads to____________?
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A. increase in both armature current and power factor angle

B. increase in back e.m.f. but decrease in armature current

C. increase in both armature current and power factor which is lagging

D. increase in torque angle but decrease in back e.m.f.

1355. The maximum power developed in a synchronous motor occurs at a coupling angle of____________?
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A. 60

B. 30

C. 90

D. 180

1356. A pony motor is basically a_________?
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A. D.C. series motor

B. small induction motor

C. D.C. shunt motor

D. double winding A.C./D.C. motor

1357. A synchronous motor running with normal excitation adjusts to load increases essentially by increase in______________?
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A. back e.m.f.

B. torque angle

C. armature current

D. power factor

1358. A synchronous motor can develop synchronous torque:
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A. while over-excited

B. when under loaded

C. below or above synchronous speed

D. only at synchronous speed
1359. The percentage slip in case of a synchronous motor is____________?
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A. zero

B. 0.50%

C. 100%

D. 1%

1360. Which of the following is a bilateral element?
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A. Constant voltage source

B. None of the above

C. Constant current source

D. Capacitance