electrical engineering MCQs – Page 122

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 Review each marked answer and report any item that may be outdated or unclear.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
2421. Assume that the op-amp of the fig. is ideal. If Vi is a triangular wave, then V0 will be______________?
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A. Sine wave

B. Square wave

C. Parabolic wave

D. Triangular wave

2422. The voltage gain of a transistor connected in common collector arrangement is____________?
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A. more than 10

B. less than 1

C. equal to 1

D. more than 100

2423. Which of the following methods of heating is not dependent on the frequency of supply ?
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A. Dielectric heating

B. All of the above

C. Induction heating

D. Electric resistance heating
2424. Voltage Series feedback also called series-shunt feedback) results in__________?
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A. Increase in both input & output impedances

B. Decreases in both input & output impedances

C. Increase in input impedance & decreases in output impedance

D. Decrease in input impedance & increase in output impedance

2425. Heat is transferred simultaneously by condition, convection and radiation_____________?
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A. inside boiler furnaces

B. through the surface of the insulted pipe carrying steam

C. from refrigerator coils to freezer of a refrigerator

D. during melting of ice

2426. Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor is______________?
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A. 200 ?

B. 50 ?

C. 12.5 ?

D. 20 K?
2427. The objective of earthing or grounding is_______________?
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A. to provide as low resistance possible to the ground

B. to provide as high resistance possible to the ground

C. to provide flow of positive, negative and zero sequence currents

D. none of the above

2428. The application where one would most likely find a crystal oscillator is____________?
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A. None of the above

B. Radio receiver

C. Radio transmitter

D. AF sweep generator

2429. In the indirect resistance heating method, maximum heat-transfer takes place by____________?
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A. radiation

B. convection

C. any of the above

D. conduction</strong>

2430. The leakage current in a crystal diode is due to _________________?
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A. junction capacitance

B. none of the above

C. minority carriers

D. majority carriers

2431. Which of the following is an advantage of eddy current heating ?
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A. The area of the surface over which heat is produced can be accurately controlled

B. The amount of heat generated can be controlled accurately

C. Heat at very high rate can be gene-rated

D. All of the above
2432. In direct arc furnace, which of the following has high value ?
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A. All of the above

B. Power factor

C. Voltage

D. Current
2433. In the breakdown region, a zener didoe behaves like a _______________source?
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A. constant current

B. none of the above

C. constant resistance

D. constant voltage
2434. The electrode of a direct arc furnace is made of____________?
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A. tungsten

B. silver

C. copper

D. graphite
2435. When current feedback (negative) is applied to an amplifier, its output impedance ________________?
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A. Is increased

B. Is decreased

C. Remains the same

D. None of the above

2436. In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is __________?
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A. Decreased 2 times

B. Increased 4 times

C. Decreased 4 times

D. Increased 2 times

2437. Which of the following insulating materials was suitable for low temperature applications ?
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A. Diatomaceous earth

B. 80 percent magnesia

C. Cork

D. Asbestos paper

2438. A Wien bridge oscillator uses___________feedback?
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A. Only positive

B. Only negative

C. Both positive and negative

D. None of the above

2439. The value of a of a transistor is_____________?
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A. more than 1

B. 1

C. less than 1

D. none of the above

2440. By which of the following methods the temperature inside arc nace can be varied ?
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A. By any of the above method

B. By varying the operating voltage

C. By disconnecting some of the heating elements

D. By varying the current through heating elements