electrical engineering MCQs – Page 119

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 Review each marked answer and report any item that may be outdated or unclear.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
2361. Most of the linear ICs are based on the two-transistor differential amplifier because of its___________?
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A. high input resistance

B. input voltage dependent linear transfer characteristic

C. high voltage gain

D. high CMRR
2362. A crystal diode has forward resistance of the order of ________________?
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A. ?

B. M?

C. k?

D. none of the above

2363. In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency____________?
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A. Decreases

B. Remains the same

C. Increases

D. Insufficient data

2364. Moisture content in the soil __________ the earth soil resistance?
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A. does not affect

B. none of the above

C. increase

D. decrease
2365. is used for heating non-conducting materials?
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A. Arc heating

B. Eddy current heating

C. Dielectric heating

D. Induction heating

2366. There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 mA. The current through the fourth resistor is______________?
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A. 490 mA

B. 12:00 AM

C. 800 mA

D. 310 mA

2367. An oscillator employs___________feedback?
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A. Positive

B. Negative

C. Data insufficient

D. Neither positive nor negative

2368. The output impedance of a transistor is____________?
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A. low

B. high

C. very low

D. zero

2369. If temperature changes, h parameters of a transistor ________________?
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A. Also change

B. Do not change

C. None of the above

D. May or may not change

2370. The base of a transistor is____________doped?
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A. none of the above

B. heavily

C. lightly

D. moderately

2371. The gain of an amplifier without feedback is 100 db. If a negative feedback of 3 db is applied, the gain of the amplifier will become______________?
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A. 5 db

B. 97 db</strong>

C. 103 db

D. 300 db

2372. A zener diode is always_______________ connected?
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A. reverse

B. none of the above

C. forward

D. either reverse or forward

2373. A crystal diode is used as______________?
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A. an amplifier

B. a voltage regulator

C. an oscillator

D. a rectifier
2374. In an electric press mica is used_____________?
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A. for induction heating

B. for dielectric heating

C. as a device for power factor improvement

D. as an insulator
2375. An important limitation of a crystal oscillator is____________?
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A. Its low output

B. Its high output

C. Less availability of quartz crystal

D. Its high Q

2376. By the use of which of the following, high frequency power supply for induction furnaces can be obtained ?
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A. Coreless transformers

B. Motor-generator set

C. Current transformers

D. Multi-phase transformer

2377. A transistor has____________?
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A. four pn junctions

B. one pn junction

C. three pn junctions

D. two pn junctions
2378. In an LC oscillator, the frequency of oscillator is____________L or C?
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A. Inversely proportional to square root of

B. Proportional to square of

C. Directly proportional to

D. Independent of the values of

2379. Hartley oscillator is commonly used in______________?
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A. Radio receivers

B. None of the above

C. Radio transmitters

D. TV receivers

2380. IC = [a / (1 a )] IB +_____________?
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A. IC

B. ICEO

C. (1 a ) IB

D. ICBO