electrical engineering MCQs – Page 120

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 Review each marked answer and report any item that may be outdated or unclear.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
2381. IC = aIE +____________?
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A. ICBO

B. ICEO

C. IB

D. IB

2382. At the base-emitter junctions of a transistor, one finds___________?
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A. a reverse bias

B. none of the above

C. a wide depletion layer

D. low resistance
2383. The arrow in the symbol of a transistor indicates the direction of____________?
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A. electron current in the emitter

B. electron current in the collector

C. hole current in the emitter

D. donor ion current

2384. Quartz crystal is most commonly used in crystal oscillators because:____________?
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A. None of the above

B. It is easily available

C. It is quite inexpensive

D. It has superior electrical properties
2385. The most commonly used transistor arrangement is____________arrangement?
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A. common base

B. none of the above

C. common collector

D. common emitter
2386. The piezoelectric effect in a crystal is___________?
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A. A change in resistance because of temperature

B. None of the above

C. A change in frequency because of temperature

D. A voltage developed because of mechanical stress
2387. The forward voltage drop across a silicon diode is about _______________?
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A. 2.5 V

B. 10 V

C. 3 V

D. 0.7 V
2388. A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation ,respectively are_____________?
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A. 25 ? & 16.7 %

B. 5 ? & 20 %

C. 5 ? & 16.7 %

D. 25 ? & 20 %
2389. A 10 V power supply would use ____________ as filter capacitor?
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A. air capacitor

B. mica capacitor

C. paper capacitor

D. electrolytic capacitor
2390. The gain of an amplifier with feedback is known as____________gain?
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A. Open loop

B. Resonant

C. Closed loop

D. None of the above

2391. The hfe parameter is called ______________in CE arrangement with output shorted?
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A. Current gain

B. Input impedance

C. Voltage gain

D. None of the above

2392. The most commonly used semiconductor in the manufacture of a transistor is_____________?
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A. silicon

B. germanium

C. carbon

D. none of the above

2393. The value of negative feedback fraction is always _______________?
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A. None of the above

B. More than 1

C. Less than 1

D. Equal to 1

2394. Induction heating process is based on which of the following principles ?
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A. Resistance heating principle

B. Thermal ion release principle

C. Nucleate heating principle

D. Electro-magnetic induction principle
2395. Which of the following heating methods has maximum power factor ?
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A. Induction heating

B. Dielectric heating

C. Resistance heating

D. Arc heating

2396. The voltage gain in a transistor connected in___________arrangement is the highest?
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A. common emitter

B. common collector

C. common base

D. none of the above

2397. There is a need of transformer for__________________?
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A. centre-tap full-wave rectifier

B. half-wave rectifier

C. none of the above

D. bridge full-wave rectifier

2398. There are ______________ h parameters of a transistor?
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A. Three

B. None of the above

C. Four

D. Two

2399. Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is______________?
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A. 31.25 mA

B. 135 mA

C. 60 mA

D. 15 mA

2400. In an LC transistor oscillator, the active device is___________?
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A. Biasing circuit

B. LC tank circuit

C. Transistor

D. None of the above