electrical engineering MCQs – Page 90

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 Review each marked answer and report any item that may be outdated or unclear.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

1781. Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla
0

A. 1000 N

B. 400 N

C. 600 N

D. 100 N

1782. A laminated iron core has reduced eddy-current losses because____________?
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A. the laminations are stacked vertfcally

B. the laminations are insulated from each other

C. the magnetic flux is concentrated in the air gap of the core

D. more wire can be used with less D.C. resistance in coil

1783. Which of the following is unit of inductance ?
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A. Webers/metre

B. Henry

C. Ampere turns

D. Ohm

1784. Electric intensity at any point in an electric field is equal to the at that point?
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A. potential gradient

B. none of the above

C. electric flux

D. magnetic flux density

1785. When both the inductance and resistance of a coil are doubled the value of________________?
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A. initial rate of rise of current is doubled

B. time constant remains unchanged

C. final steady current is doubled

D. time constant is halved

1786. The capacitance C is charged through a resistance R. The time constant of the charging circuit is given by__________?
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A. RIC

B. CIR

C. 1/RC

D. RC

1787. The units of capacitance are____________?
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A. coulombs/volt

B. ohms

C. volts/coulomb

D. henry/Wb

1788. A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?
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A. 5 s

B. 0.5 s

C. 0.01 s

D. 0.1 s

1789. The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?
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A. They are mechanically strong

B. They do not require any voltage for filament heating

C. Both (A) and (B)

D. None of the above

1790. The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to _________ percent of its value
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A. 37, final

B. 62, final

C. 62, initial

D. 37, initial

1791. Energy stored by a coil is doubled when its current is increased by percent___________?
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A. 50

B. 100

C. 25

D. 41.4

1792. When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of_____________?
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A. 4 joules

B. 8 joules

C. 6 joules

D. 2 joules

1793. Which of the following statements is incorrect ?
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A. A capacitor can store charge because it has a dielectric between two conductors

B. The thinner the dielectric, the more the capacitance and the lower the voltage breakdown rating for a capacitor .

C. A six dot mica capacitor colour coded white, green, black, red and yellow has the capacitance value of 500 pF

D. Capacitors in series provide less capacitance but a higher voltage breakdown rating for the combination

1794. Silicon steel is used in electrical machines because it has_____________?
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A. low coercivity

B. low hysteresis loss

C. high coercivity

D. low retentivity

1795. Which of the following rectifiers have been used extensively in supplying direct current for electroplating ?
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A. Selenium rectifiers

B. Mechanical rectifiers

C. Copper oxide rectifiers

D. Mercury arc rectifiers

E. None of the above

1796. Which of the following factors adversely affects the capacity of the leadacid battery ?
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A. Rate of discharge

B. All of the above

C. Temperature of surroundings

D. Specific gravity of electrolyte

1797. Which of the following battery is used for air-craft _____________?
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A. Dry cell battery

B. Lead-acid battery

C. Silver oxide battery

D. Nickel-iron battery

1798. Dielectric strength of a material depends on_____________?
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A. moisture content

B. temperature

C. thickness

D. all of the above

E. none of the above

1799. The electric field at a point situated at a distance d from straight charged conductor is____________?
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A. none of the above

B. inversely proportional to d

C. proportional to d

D. inversely proportional to d

1800. Which of the following has lower specific gravity V__________?
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A. Any of the above

B. Dilute H2S04

C. Concentrated H2SO4

D. Water

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