electrical engineering MCQs – Page 19

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 Review each marked answer and report any item that may be outdated or unclear.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
361. A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will__________
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A. heater will burn out

B. increase

C. decrease

D. remain same

362. The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other ?
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A. 48 Q

B. 18 Q

C. 64 Q

D. 36 Q
363. In a given transformer for given applied voltage, losses which remain constant irrespective of load changes are______________?
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A. none of the above

B. friction and windage losses

C. copper losses

D. hysteresis and eddy current losses
364. The substances which have a large number of free electrons and offer a low resistance are called____?
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A. insulators

B. conductors

C. semi-conductors

D. inductors

365. The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true_______________?
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A. The current through each bulb in same

B. The power dissipation in each bulb is not same

C. None of the above

D. The voltage across each bulb is not same

366. Which of the following can have negative temperature coefficient _____________?
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A. Liquid metals

B. Electrolytes

C. Metallic alloys

D. Compounds of silver

367. Negative voltage regulation is indicative that the load is___________?
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A. inductive only

B. capacitive only

C. none of the above

D. inductive or resistive

368. Which of the following does not change in an ordinary transformer ?
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A. Current

B. Frequency

C. Voltage

D. Any of the above

369. Ripple factor is the ratio of______________________?
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A. Rms value of the ac component of load voltage to the dc voltage

B. Peak value of the dc component of load voltage to the ac voltage

C. Average value of the ac component of load voltage to the peak value of voltage

D. Average value of the dc component of load voltage to the ac voltage

370. The path of a magnetic flux in a transformer should have______________?
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A. high reluctance

B. low reluctance

C. low resistance

D. high resistance

371. In a square wave operation of 3 phase CSIs, the power values are on for___________?
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A. 60 degree

B. 90 degree

C. 150 degree

D. 120 degree
372. In a transformer routine efficiency depends upon_____________?
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A. supply frequency

B. load current

C. power factor of load

D. both B. and (c)
373. The rating of a fuse wire is always expressed in________________?
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A. ampere-hours

B. kWh

C. amperes

D. ampere-volts

374. Which of the following property is not necessarily desirable in the material for transformer core ?
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A. Low hysteresis loss

B. High thermal conductivity

C. Mechanical strength

D. High permeability

375. The transfer function of PWM is generally developed in______________?
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A. Either A. or B.

B. Time domain

C. Frequency domain

D. None of these

376. The minimum charge on an ion is______________?
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A. equal to the atomic number of the atom

B. equal to the charge of the number of electrons in an atom (#) zero

C. equal to the charge of an electron
377. A closed switch has a resistance of_____________?
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A. about 500 ohms

B. infinity

C. zero

D. about 50 ohms

378. Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open_________________?
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A. all three bulbs will light

B. rest of the two bulbs will not light

C. the other two bulbs will light

D. there will be heavy current in the main line

379. A nichrome wire used as a heater coil has the resistance of 2 2/m. For a heater of 1 kW at 200 V, the length of wire required will be_____________?
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A. 20 m

B. 40 m

C. 80 m

D. 60 m

380. In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains______________?
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A. length of heating element should be decreased

B. length of heating element should be increased

C. length of heating element has no effect on heating if water

D. none of the above