electrical engineering MCQs – Page 71

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 Review each marked answer and report any item that may be outdated or unclear.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
1401. Synchronous motors are_____________?
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A. not-self starting

B. none of the above

C. self-starting

D. essentially self-starting

1402. A synchronous motor can operate at____________?
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A. lagging, leading and unity power factors

B. leading power factor only

C. lagging power factor only

D. unity power factor only

1403. Depreciation charges are high in case of__________?
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A. none of these

B. thermal plant

C. diesel plant

D. hydroelectric plant

1404. The phase difference between voltage and current wave through a circuit element is given as 30. The essential condition is that
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A. both waves must have same frequency

B. both waves must have identical peak values

C. both waves must have zero value at the same time

D. none of the above

1405. The back e.m.f. in the stator of a synchronous motor depends on____________?
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A. none of the above

B. flux density

C. rotor speed

D. rotor excitation

E. number of poles

1406. With reference to a power station which of the following is not a fixed cost?
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A. Insurance charges

B. Interest on capital

C. Fuel cost

D. Depreciation

1407. Approximate estimation of power demand can be made by_____________?
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A. load survey method

B. economic parameters

C. all of the above

D. mathematical method

E. statistical methods

1408. By the use of which of the following power factor can be improved?
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A. Static capacitors

B. Phase advancers

C. Any of the above

D. Synchronous compensators

1409. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is____________?
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A. a sinusoid of double the frequency

B. a sinusoid of half the original frequency

C. a sinusoid of the same frequency

D. not a sinusoid

1410. A synchronous motor can be started by________?
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A. providing damper winding

B. any of the above

C. D.C. compound motor

D. pony motor

1411. The working of a synchronous motor is similar to_____________?
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A. gear train arrangement

B. none of the above

C. transmission of mechanical power by shaft

D. turbine

E. distribution transformer

1412. Generators for peak load plants are usually designed for maximum efficiency at____________?
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A. 25 percent overload

B. full load

C. 25 to 50 percent full load

D. 50 to 75 percent full load
1413. In case of _________ fuel transportation is the major problem.
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A. thermal power plants

B. diesel power plants

C. nuclear power plants

D. hydro-electric power plants

1414. A terminal where three on more branches meet is known as______________?
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A. anode

B. combination

C. node

D. terminus

1415. A rotory converter can also be run as a___________?
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A. d.c. shunt motor

B. induction motor

C. d.c. series motor

D. synchronous motor

E. d.c. compound motor

1416. The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as___________?
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A. bilateral circuit

B. non-linear circuit

C. linear circuit

D. none of the above

1417. Kirchhoff s current law states that
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A. net current flow at the junction is positive

B. total sum of currents meeting at the junction is zero

C. no current can leave the junction without some current entering it.

D. Hebraic sum of the currents meeting at the junction is zero
1418. A consumer has to pay lesser fixed charges in____________?
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A. any of the above

B. two part tariff

C. maximum demand tariff

D. flat rate tariff

1419. A synchronous motor can be made self starting by providing?
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A. damper winding on stator as well as rotor poles

B. none of the above

C. damper winding on stator

D. damper winding on rotor poles

1420. Power factor of an electrical circuit is equal to____________?
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A. kW/kVA

B. R/Z

C. cosine of phase angle difference be-tween current and voltage

D. all of these

E. ratio of useful current to total current Iw/I