electrical engineering MCQs – Page 114

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 Review each marked answer and report any item that may be outdated or unclear.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
2261. In arc furnace the function of choke is______________?
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A. to stabilize the arc

B. to imprpve, power factor

C. none of the above

D. to reduce severity of the surge

2262. An ammeter has an internal resistance of 50 ?. The meter movement itself can handle up to 1 mA. If 10 mA is applied to the meter, the shunt resistor, RSH1, is approximately___________?
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A. 55 ?

B. 9 ?

C. 5.5 ?

D. 50 ?

2263. The current gain of a BJT is__________?
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A. gm r0

B. gm /r?

C. gm r?

D. gm / r0

2264. When voltage feedback (negative) is applied to an amplifier, its input impedance _______________?
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A. None of the above

B. Is increased

C. Remains the same

D. Is decreased

2265. For the same secondary voltage, the output voltage from a centre-tap rectifier is___________ than that of bridge rectifier?
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A. thrice

B. four time

C. twice

D. one-half
2266. For heating element high resistivity material is chosen to______________?
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A. reduce the length of heating element

B. reduce the effect of oxidation

C. increase the life of the heating element

D. produce large amount of heat

2267. A differential amplifier has a differential gain of 20,000. CMMR=80dB. The common mode gain is given by_______________?
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A. 1

B. 0

C. 2

D. 2-Jan

2268. In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db &2db respectively, then its common mode rejection ratio is__________?
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A. 50dB

B. 23dB

C. 46dB

D. 25dB

2269. In heating the ferromagnetic material by induction heating, heat is produced due to_____________?
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A. none of the above factors

B. induced current flow through the charge

C. due to hysteresis loss as well as eddy current loss takingplace in the charge

D. hysteresis loss taking place below curie temperature

2270. Average resistance of human body is____________?
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A. 2000 ohms

B. 1000 ohms

C. 1500 ohms

D. 500 ohms

2271. The parameter hie stands for input impedance in _____________?
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A. CE arrangement with output shorted

B. CB arrangement with output shorted

C. None of the above

D. CC arrangement with output shorted

2272. If one of the resistors in a parallel circuit is removed, the total resistance_____________?
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A. decreases

B. doubles

C. remains the same

D. increases
2273. The bandwidth of an RF tuned amplifier is dependent on____________?
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A. Q factor of the tuned o/p circuit

B. Q factor of the tuned i/p circuit

C. Q-factor of the o/p and i/p circuits as well as quiescent operating point

D. Quiescent operating point

2274. A set of Christmas tree lights is connected in parallel across a 110 V source. The filament of each light bulb is 1.8 k. The current through each bulb is approximately___________?
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A. 61 mA

B. 110 mA

C. 610 mA

D. 18 mA

2275. An OPAMP has a slew rate of 5 V/? S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is_______________?
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A. 5 volts

B. 5/ volts

C. 10 volts

D. 5/2 volts
2276. Four 8 ? speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers_____________?
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A. 1.5 W

B. 18 W

C. 48 W

D. 72 W
2277. A transistor behaves as a linear device for _____________?
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A. Small signals only

B. Large signals only

C. Both small and large signals

D. None of the above

2278. In Colpitts oscillator, feedback is obtained___________?
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A. By a tickler coil

B. None of the above

C. From the centre of split capacitors

D. A. By magnetic induction

2279. ____________ rectifier has the lowest forward resistance?
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A. none of the above

B. solid state

C. gas tube

D. vacuum tube

2280. A zener diode is________________ device?
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A. an amplifying

B. none of the above

C. a non-linear

D. a linear