electrical engineering MCQs – Page 174

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 Review each marked answer and report any item that may be outdated or unclear.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
3461. The radio wave picked up by the receiving antenna is amplified about _________________ times to have reasonable sound output?
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A. 10000

B. 100

C. 1000

D. A million
3462. A parallel resonant band-pass filter consists of a 90 ? resistor in series with a parallel network made up of a 60 mH coil and a 0.02 F capacitor. The output is taken across the capacitor/coil. The coil winding has a resistance of 20 ?. What is the center frequency of the filter?
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A. 999 Hz

B. 459 Hz

C. 2,176 Hz

D. 4,591 Hz
3463. A single stage transistor amplifier contains______________ and associated circuitry?
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A. Two transistors

B. One transistor

C. None of the above

D. Three transistor

3464. A hollow metallic sphere of 8cm diameter is charged with 4 x 10 8C. The potential on its surface will be_________________?
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A. 900 volts

B. 90 volts

C. zero

D. 9000 volts
3465. The parallel combination of a 470 ? resistor and a 1.2 k? resistor is in series with the parallel combination of three 3 k? resistors. A 200 V source is connected across the circuit. The resistor with the most current has a value of____________?
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A. 1.2 k?

B. 3 k?

C. 470 ? or 1.2 k?

D. 470 ?
3466. In transistor amplifiers, we use_____________transformer for impedance matching?
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A. Same turn ratio

B. Step up

C. e of the above

D. Step down
3467. Equipotential planes are_______________?
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A. parallel to one another

B. intersecting

C. non parallel to one another

D. circular

3468. If a charged rod is brought closer to a gas filled balloon then______________?
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A. Radius decreases

B. Balloon bursts

C. Radius increase

D. Balloon squeezes

3469. Selenium becomes a conductor in light so it behaves like____________?
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A. Light emitting diode

B. Photodiode

C. Capacitor

D. Semiconductor

3470. Which instrument is used to measure the power of electric circuit ?
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A. None of these

B. Wattmeter

C. Viscometer

D. Wavemeter

3471. An AF amplifier is shielded to ________________?
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A. Keep the amplifier cool

B. None of the above

C. Prevent induction due to stray magnetic fields

D. Protect from rusting

3472. The emf induced in a conductor of unit length moving with unit velocity at right angles to a magnetic field is equal to_____________?
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A. Mutual induction

B. Torque

C. Magnetic flux density

D. Motional emf

3473. In the zero signal conditions, a transistor sees _____________ load?
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A. c.

B. c.

C. both d.c. and a.c.

D. none of the above

3474. Transformer works on the principle of________________?
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A. Lenzs law

B. Mutual induction

C. Faradays law

D. Law of conservation of power

3475. The parallel combination of a 470 ? resistor and a 680 ? resistor is in series with the parallel combination of four 2 k? resistors. The total resistance is___________?
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A. 1,078 ?

B. 778 ?

C. 77.8 ?

D. 1,650 ?

3476. The parallel combination of a 470 ? resistor and a 1.5 k? resistor is in series with the parallel combination of five 1 k? resistors. The source voltage is 50 V. The percentage of the load current through any single 1 K? resistor is__________?
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A. 100%

B. 20 %

C. 50%

D. 25%

3477. In a charged capacitor the energy resides in________________?
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A. electric field

B. magnetic hield

C. gravitational field

D. nuclear field

3478. If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is________________?
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A. 20V

B. 1V

C. 10V

D. 100V

3479. The positive (+) and negative (-) ends of the battery are called ___________?
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A. battery sides

B. circuit diagram

C. battery terminals

D. battery knobs

3480. If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by_____________?
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A. Vs/Vp = Ns/Np

B. Vp/Vs = Ns/Np

C. Vs/Vp = Np/Ns

D. Vp/Vs = Np/Ns