electrical engineering MCQs – Page 66

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 Review each marked answer and report any item that may be outdated or unclear.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
1301. In any network containing more than one sources of e.m.f. the current in any branch is the algebraic sum of a number of individual fictitious currents (the number being equal to the number of sources of e.m.f.), each of which is due to separate action of each source of e.m.f., taken in order, when the remaining sources of e.m.f. are replaced by conductors, the resistances of which are equal to the internal resistances of the respective sources. The above statement is associated with:
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A. None of the above

B. Thevenins theorem

C. Superposition theorem

D. Nortons theorem

1302. power plant is expected to have the longest life?
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A. Diesel

B. Any of the above

C. Hydroelectric

D. Steam

1303. Following power plant has instant starting?
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A. nuclear power plant

B. hydro power plant

C. diesel power plant

D. both B and C

E. none of the above

1304. For maximum transfer of power, internal resistance of the source should be_____________?
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A. none of the above

B. greater than the load resistance

C. less than the load resistance

D. equal to load resistance
1305. Which of the following losses is not dissipated by the stator core surface in a synchronous motor?
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A. Iron losses in the stator

B. Eddy current losses in the conductors

C. Copper losses in the slot portion of the conductors

D. Windage losses

E. None of the above

1306. An induction motor has relatively high power factor at__________?
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A. near full load

B. rated r.p.m.

C. no load

D. 20 percent load

1307. Ships are generally powered by___________?
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A. none of the above

B. hydraulic turbines

C. nuclear power plants

D. diesel engines

E. steam accumulators

1308. __________ is invariably used for peak load
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A. Steam turbine plant

B. None of the above

C. Pumped storage plant

D. Nuclear power plant

1309. The period of a sine wave is _____ seconds. Its frequency is
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A. 20 Hz

B. 40 Hz

C. 30 Hz

D. 50 Hz
1310. Direct conversion of heat into electric power is possible through__________?
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A. batteries

B. thermionic converter

C. all of the above

D. fuel cell

1311. For a diesel generating station the useful life is expected to be around_________Years?
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A. 50 to 75 years

B. 75 to 100 years

C. 15 to 20 years

D. 20 to 50 years

1312. In a 3-phase synchronous motor, the negative phase sequence exists when the motor is_______________?
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A. none of the above

B. under-loaded

C. over-loaded

D. supplied with unbalanced voltage
1313. Any number of current sources in parallel may be replaced by a single current source whose current is the algebraic sum of individual source currents and source resistance is the parallel combination of individual source resistances. This statement is associated with:
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A. Thevenins theorem

B. None of the above

C. Millmans theorem

D. Maximum power transfer theorem

1314. If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will__________?
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A. function as static condenser

B. stop

C. burn with dense smoke

D. run as induction motor

1315. For the same peak value which of the following wave will have the highest r.m.s. value?
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A. half wave rectified sine wave

B. triangular wave

C. sine wave

D. square wave
1316. Efficiency of power transfer when maximum transfer of power c xerosis
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A. 75%

B. 100%

C. 50%

D. 80%

1317. A nuclear power plant is invariably used as a__________?
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A. any of the above

B. peak load plant

C. stand-by plant

D. base load plant

E. spinning reserve plant

1318. In _________ fuel transportation cost is least.
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A. nuclear power plants

B. None

C. steam power stations

D. diesel generating plants

1319. A pilot exciter is provided on generators for which of the following reasons?
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A. To provide requisite starting torque to generator

B. To excite the poles of main exciter

C. To provide requisite starting torque to main exciter

D. None of the above

1320. A synchronous motor which works on a leading power factor and does not drive a mechanical load is called as_________?
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A. synchronous condenser

B. static condenser

C. condenser

D. none of the above