electrical engineering MCQs – Page 115

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 Review each marked answer and report any item that may be outdated or unclear.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
2281. A change in the value of the emitter resistance Re in a differential amplifier?
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A. affects the difference mode gain Ad

B. affects the common mode gain Ac

C. ffects both Ad and Ac

D. does not effect either Ad and Ac

2282. A non-dimensional number generally associated with natural convection heat transfer is____________?
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A. Pecelet number

B. Nusselt number

C. Grashoff number

D. Prandtl number

2283. Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately___________?
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A. 2.2 A

B. 1.8 A

C. 9.09 A

D. 137 mA

2284. Six resistors are in parallel. The two lowest-value resistors are both 1.2 k?. The total resistance_____________?
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A. is less than 6 k?

B. is less than 1.2 k?

C. is less than 600 ?

D. is greater than 1.2 k?

2285. IC = [a / (1 a )] IB + [___________ / (1 a )?
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A. ICBO

B. IE

C. ICEO

D. IC

2286. Emitter follower is a _______________circuit?
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A. Voltage feedback

B. Current feedback

C. Both voltage and current feedback

D. None of the above

2287. Emitter follower is used for ________________?
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A. Impedance matching

B. Voltage gain

C. None of the above

D. Current gain

2288. BC 147 transistor indicates that it is made of____________?
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A. carbon

B. silicon

C. none of the above

D. germanium

2289. When a 1.6 k? resistor and a 120? resistor are connected in parallel, the total resistance is____________?
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A. greater than 120 but less than 1.6 k?

B. greater than 1.6 k?

C. less than 120 but greater than 100 ?

D. less than 100 ?

2290. When a crystal diode is used as a rectifier, the most important consideration is ____________?
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A. doping level

B. forward characteristic

C. reverse characteristic

D. PIC rating
2291. If the a.c. input to a half-wave rectifier is an r.m.s value of 400/?2 volts, then diode PIV rating is__________________?
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A. none of the above

B. 400 x ?2 V

C. 400 V

D. 400/?2 V

2292. A transistor is connected in CB mode. If it is not connected in CE mode with same bias voltages, the values of IE, IB and IC will____________?
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A. decrease

B. none of the above

C. remain the same

D. increase

2293. Which of the following is not associated with a p-n junction?
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A. junction capacitance

B. depletion capacitance

C. charge storage capacitance

D. channel length modulation
2294. The input impedance of a transistor is___________?
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A. high

B. very high

C. almost zero

D. low
2295. The Q of the crystal is of the order of____________?
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A. 50

B. More than 10,000

C. 100

D. 1000

2296. In a five-branch parallel circuit, there are 12 mA of current in each branch. If one of the branches opens, the current in each of the other four branches is_______________?
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A. 3 mA

B. 12:00 AM

C. 12 mA

D. 48 mA

2297. The PIV rating of a crystal diode is _______________ that of equivalent vacuum diode
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A. none of the above

B. more than

C. the same as

D. lower than
2298. If the output of an amplifier is 10 V and 100 mV from the output is fed back to the input, then feedback fraction is_____________?
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A. 15

B. 10

C. 1

D. 01
2299. The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is_____________?
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A. the larger of the two

B. 7 A

C. unknown

D. 1:00 AM

2300. A 470 ? resistor, a 220 ? resistor, and a 100 ? resistor are all in parallel. The total resistance is approximately________________?
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A. 60 ?

B. 30 ?

C. 470 ?

D. 790 ?