electrical engineering MCQs – Page 118

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 Review each marked answer and report any item that may be outdated or unclear.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 generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

2341. Which of the following will happen if the thickness of refractory wall of furnace is increased ?
0

A. Heat loss through furnace wall will increase

B. Energy consumption will increase

C. Temperature inside the furnace will fall

D. Temperature on the outer surface of furnace walls will drop

2342. Mains a.c. power is converrted into d.c. power for_________________?
0

A. none of the above

B. lighting purposes

C. using in electronic equipment

D. heaters

2343. The disadvantage of a half-wave rectifier is that the__________________?
0

A. none of the above

B. output is difficult to filter

C. components are expensive

D. diodes must have a higher power rating

2344. Three 47 ? resistors are connected in parallel across a 110 volt source. The current drawn from the source is approximately_______________?
0

A. 47 mA

B. 780 mA

C. 7.06 A

D. 2.3 A

2345. If the doping level of a crystal diode is increased, the breakdown voltage__________________?
0

A. is decreased

B. none of the above

C. remains the same

D. is increased

2346. Properly of low temperature co-eflficient of heating element is desired due to which of the following reasons ?
0

A. To avoid initial rush of current

B. To avoid change in kW rating with temperature

C. Both (A) and (B)

D. Either (A) or (B)

2347. If the crystal frequency changes with temperature, we say that crystal has___________temperature coefficient?
0

A. Negative

B. None of the above

C. Zero

D. Positive

2348. Most of the majority carriers from the emitter____________?
0

A. recombine in the emitter

B. recombine in the base

C. pass through the base region to the collector

D. none of the above

2349. Four resistors of equal value are connected in parallel. If the total voltage is 15 V and the total resistance is 600 ?, the current through each parallel resistor is____________?
0

A. 6.25 mA

B. 25 mA

C. 100 mA

D. 200 mA

2350. The phase difference between the input and output voltages in a common base arrangement is___________?
0

A. 0o

B. 90o

C. 180o

D. 270o

2351. A constant current signal across a parallel RLC circuits gives an o/p of 1.4v at the signal frequency of 3.89KHZ and 4.1KHZ .At the frequency of 4KHZ,the o/p voltage will be___________?
0

A. 1.4v

B. 1 v

C. 2v

D. 2.8v

2352. As the temperature of a transistor goes up, the base-emitter resistance___________?
0

A. increases

B. none of the above

C. remains the same

D. decreases

2353. _________ has the highest value of thermal conductivity?
0

A. Steel

B. Copper

C. Brass

D. Aluminium

2354. IC = IB +__________?
0

A. ICEO

B. IC

C. ICBO

D. aIE

2355. A zener diode has ______________ breakdown voltage?
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A. undefined

B. none of the above

C. zero

D. sharp

2356. Factors on which soil resistance depends_______________?
0

A. all the above

B. moisture

C. Nacl

D. depth of the electrode

2357. The crystal oscillator frequency is very stable due to___________of the crystal?
0

A. High Q

B. Low Q

C. Vibrations

D. Rigidity

2358. Resistance variation method of temperature control is done by connecting resistance elements in_____________?
0

A. series-parallel connections

B. star-delta connections

C. parallel

D. all of the above ways

E. series

2359. The leakage current in CE arrangement is____________that in CB arrangement?
0

A. none of the above

B. more than

C. the same as

D. less than

2360. Thermal runaway is not possible in FET because as the temperature of FET increases_________________?
0

A. none of the above

B. the transconductance increases

C. the drain current increases

D. the mobility decreases

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