electrical engineering MCQs – Page 63

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 Review each marked answer and report any item that may be outdated or unclear.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
1241. Power electronics essentially deals with control of a.c. power at____________?
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A. Frequencies above 1000 kHz

B. Frequencies above 20 kHz

C. Frequencies less than 10 Hz

D. 50 Hz frequency
1242. Which of the following component, in a steam power plant, needs maximum maintenance attention?
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A. Water treatment plant

B. Boiler

C. Condenser

D. Steam turbine

1243. Which of the following is the disadvantage of a synchronous condenser?
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A. Continuous losses in motor

B. Noise

C. High maintenance cost

D. All of the above
1244. Kirchhoffs voltage law is related to_____________?
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A. junction currents

B. battery e.m.fs.

C. IR drops

D. both B. and C.

E. none of the above

1245. In a series resonant circuit, the impedance of the circuit is___________?
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A. minimum

B. zero

C. none of the above

D. maximum

1246. An alternator coupled to a __________ runs at slow speed, as compared to as compared to others.
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A. steam turbine

B. diesel engine

C. hydraulic turbine

D. gas turbine

1247. In a synchronous motor, the magnitude of stator back e.m.f. & depends on_______________?
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A. d.c. excitation only

B. speed of the motor

C. load on the motor

D. both the speed and rotor flux

1248. Which of the following methods is used to start a synchronous motor?
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A. Resistance starter in the armature circuit

B. Damper winding

C. Star-delta starter

D. Damper winding in conjunction with star-delta starter
1249. The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as__________?
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A. reluctance torque

B. locked-rotor torque

C. synchronous torque

D. pull up torque

1250. The knowledge of diversity factor helps in determining__________?
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A. average load

B. peak load

C. kWh generated

D. plant capacity
1251. The expected useful life of an hydroelectric power station is around_________________?
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A. 60 years

B. 15 years

C. 30 years

D. 100 years
1252. An ideal voltage source has__________?
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A. zero internal resistance

B. open circuit voltage equal to the voltage on full load

C. terminal voltage in proportion to current

D. terminal voltage in proportion to load

1253. Different generating stations use following prime movers?
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A. hydraulic turbine

B. any of the above

C. steam turbine

D. diesel engine

E. gas turbine

1254. Synchronsizing power of a synchronous machine is_____________?
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A. inversely proportional to the synchronous reactance

B. equal to the synchronous reactance

C. direcly proportional to the synchronous reactance

D. none of the above

1255. A synchronous motor can be used as a synchronous capacitor when it is____________?
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A. under-loaded

B. over-excited

C. under-excited

D. over-loaded

1256. In power plants insurance cover is provided for which of the following?
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A. Equipment only

B. All of the above

C. Skilled workers only

D. Unskilled workers only

1257. The connected load of a IVMIM uir consumer is around___________?
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A. 80 kW

B. 120 kW

C. 5 kW

D. 40 kV

1258. AC power in a load can be controlled by using_____________?
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A. two SCRs in parallel opposition

B. four SCRs in series

C. three SCRs in series

D. two SCRs in series

1259. The increased load during summer months is due to____________?
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A. none of the above

B. increased use of fans and air conditioners

C. increased business activity

D. increased water supply

1260. Load curve of a power plant has always____________?
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A. negative slope

B. All of these

C. zero slope

D. positive slope