electrical engineering MCQs – Page 368

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 Review each marked answer and report any item that may be outdated or unclear.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
7341. For which of the following equipment current rating is not necessary?
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A. Circuit breakers

B. Isolators

C. Load break switch

D. Circuit breakers and load break switches

7342. A 3-phase 4 wire system is commonly used on________________?
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A. secondary distribution

B. secondary transmission

C. primary distribution

D. primary transmission

7343. In transmission lines the cross-arms are made of________________?
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A. wood

B. copper

C. R.C.C.

D. steel
7344. Constant voltage transmission entails the following disadvantage?
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A. large conductor area is required for same power transmission

B. none of the above

C. short-circuit current of the system is increased

D. either of the above

7345. The presence of ozone due to corona is harmful because it________________?
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A. none of the above

B. transfer energy to the ground

C. gives odour

D. corrodes the material

E. reduces power factor

7346. In a tap changing transformer, the tappings are provided on__________?
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A. primary winding

B. any of the above

C. secondary winding

D. high voltage winding
7347. When an alternator connected to the bus-bar is shut down the bus-bar voltage will___________?
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A. none of the above

B. rise

C. fall

D. remain unchanged
7348. The wooden poles well impregnated with creosite oil or any preservative compound have life_____________?
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A. from 2 to 5 years

B. 60 to 70 years

C. 25 to 30 years

D. 10 to 15 years

7349. jCorona usually occurs when the electrostatic stress in air around the conductor exceeds?
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A. 22 kV (maximum value)/cm

B. 6.6 kV (r.m.s. value)/cm

C. 30 kV (maximum value)/cm

D. 11 kV (r.m.s. value)/cm

7350. A booster is a_________________?
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A. series wound generator

B. shunt wound generator

C. synchronous generator

D. none of the above

7351. The square root of the ratio of line impedance and shunt admittance is called the___________?
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A. regulation of the line

B. none of the above

C. conductance of the line

D. surge impedance of the line
7352. There is a greater possibility of occurence of corona during______________?
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A. summer heat

B. none of the above

C. winter

D. dry weather

E. humid weather
7353. The power transmitted will be maximum when____________?
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A. receiving end voltage is more

B. reactance is high

C. corona losses are minimum

D. sending end voltage is more

7354. 310 km line is considered as_______________?
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A. a medium line

B. a short line

C. any of the above

D. a long line
7355. A feeder, in a transmission system, feeds power to________________?
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A. all of the above

B. distributors

C. service mains

D. generating stations

7356. Electro-mechanical voltage regulators are generally used in___________?
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A. all of the above

B. generators

C. reactors

D. transformers

7357. Which of the following are the constants of the transmission lines ?
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A. All of the above

B. Capacitance

C. Inductance

D. Resistance

7358. The voltage regulation in magnetic amplifier type voltage regulator is effected by__________?
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A. varying the reactance

B. electromagnetic induction

C. variable transformer

D. varying the resistance

7359. The usual spans with R.C.C. poles are_______________?
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A. 4050 meters

B. 60100 meters

C. 300500 meters

D. 80100 meters
7360. The operating voltage of supertension cables is up to_________________?
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A. 3.3 kV

B. 6.6 kV

C. 11 kV

D. 33 kV