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
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
7361. By which of the following a bus-bar is rated?
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A. Current, voltage, frequency and short time current

B. Current, voltage and frequency

C. Current and voltage

D. Current only

7362. In aluminium conductors, steel core is provided to____________?
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A. compensate for skin effect

B. increase the tensile strength

C. neutralise proximity effect

D. reduce line inductance

7363. Large industrial consumers are supplied electrical energy at__________________?
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A. 400 V

B. 400 kV

C. 11 kV

D. 66 kV

7364. By which of the following systems electric power may be transmitted ?
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A. Overhead system

B. Underground system

C. Both A. and (b)

D. None of the above

7365. Series capacitors on transmission lines are of little use when the load VAR requirement is___________?
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A. fluctuating

B. small

C. large

D. any of the above

7366. Which of the following relays is used on long transmission lines?
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A. Impedance relay

B. Mhos relay

C. None of the above

D. Reactance relay

7367. Transmission voltage of 11 kV is normally used for distances up to_____km?
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A. 80100 km

B. 4050 km

C. 6070 km

D. 2025 km
7368. Overhead system can be designed for operation up to____________?
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A. 400 kV

B. 33 kV

C. 11 kV

D. 66 kV

7369. The effect of corona can be detected by___________?
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A. all of the above

B. faint luminous glow of bluish colour

C. presence of ozone detected by odour

D. hissing sound

7370. Owing to skin effect:
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A. none of the above

B. portion of the conductor near the surface carries more current and core of the conductor carries less current

C. current flows through the half cross-section of the conductor

D. any of the above

E. portion of the conductor near the surface carries less current and core of the conductor carries more current

7371. Aluminium has a specific gravity of___________?
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A. 7.8

B. 1.5

C. 4.2

D. 2.7
7372. The following system is not generally used?
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A. 3-phase 4 wire

B. 1-phase 3 wire

C. 3-phase 3 wire

D. 1-phase 4 wire

7373. In a substation the following equipment is not installed?
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A. shunt reactors

B. exciters

C. series capacitors

D. voltatre transformers

7374. Most of the high transmission lines in Pakistan are_______________?
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A. none of the above

B. underground

C. overhead

D. either of the above

7375. Which of the following materials is not used for transmission and distribution of electrical power________________?
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A. Steel

B. Aluminium

C. Tungsten

D. Copper

7376. Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased 100 percent, saving in copper is____________________?
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A. 50 percent

B. 100 percent

C. 75 percent

D. 25 percent

7377. For transmission of power over a distance of 500 km, the transmission voltage should be in the range?
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A. 100 to 120 kV

B. 60 to 100 kV

C. 20 to 50 kV

D. 150 to 220 kV
7378. The power factor of industrial loads is generally______________?
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A. leading

B. zero

C. lagging

D. unity

7379. The underground system cannot be operated above_________________?
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A. 66 kV

B. 440 V

C. 33 kV

D. 11 kV

7380. The voltage of the single phase supply to residential consumers is_____________?
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A. 230 V

B. 110 V

C. 400 V

D. 210 V

7381. The corona is considerably affected by which of the following _______________?
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A. Shape of the conductor

B. Surface condition of the conductor

C. All of the above

D. Size of the conductor