electrical engineering MCQs – Page 228

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 Review each marked answer and report any item that may be outdated or unclear.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

4541. Wire-wound resistors are unsuitable for use at high frequencies because they_______?
0

A. exhibit unwanted inductive and capacitive effects

B. create more electrical noise

C. consume more power

D. are likely to melt under excessive eddy current heat

4542. Capacitive susceptance is a measure of__________?
0

A. a purely capacitive circuits ability to resist the flow of current

B. the extent of neutralisation of reactive power in a circuit

C. a purely capacitive circuits ability to pass current

D. reactive power in a circuit

4543. The frequency of an alternating current is____________?
0

A. the number of waves passing through a point in one second

B. the speed with which the alternator runs

C. the number of electrons passing through a point in one second

D. the number of cycles generated in one minute

4544. Power factor of electric bulb is__________?
0

A. leading

B. zero

C. unity

D. lagging

4545. The phosphors for which of the following pair are 180 out of phase for VL, VC and VR______?
0

A. Vc and VR

B. Vc and VL

C. none of the above

D. VL and VR

4546. Which of the following waves has the highest value of peak factor ___________?
0

A. Sine wave

B. Square wave

C. Triangular wave

D. Half wave rectified sine wave

4547. In a purely inductive circuit__________?
0

A. none of above is zero

B. actual power is zero

C. apparent power is zero

D. reactive power is zero

4548. Time constant of a circuit is the time in seconds taken after the application of voltage to each___________?
0

A. 63% of maximum value

B. 25% of maximum value

C. 90% of the maximum value

D. 50% of maximum value

4549. Magnitude of current at resonance in R-L-C circuit________?
0

A. depends upon the magnitude of L

B. depends upon the magnitude of R, Land C

C. depends upon the magnitude of C

D. depends upon the magnitude of R

4550. Time constant of a capacitive circuit__________?
0

A. increases with the decrease of capacitance and decrease of resistance

B. increases with the increase of capacitance and decrease of resistance

C. increase with increase of capacitance and increase of resistance

D. increases with the decrease of capacitance and increase of resistance

4551. Which of the following circuit component opposes the change in the circuit voltage ?
0

A. Resistance

B. Inductance

C. Conductance

D. Capacitance

4552. In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will__________?
0

A. be reduced by half

B. be reduced to one fourth

C. be four times at high

D. be doubled

4553. In a R-L-C circuit_________?
0

A. all above are correct

B. exchange of power takes place between capacitor and supply line

C. exchange of power takes place between inductor and supply line

D. power is consumed in resistance and is equal to I R

E. exchange of power does not take place between resistance and the supply line

4554. Ohm is unit of all of the following except___________?
0

A. capacitance

B. resistance

C. capacitive reactance

D. inductive reactance

4555. At _______ frequencies the parallel R-L circuit behaves as purely resistive
0

A. low

B. high

C. very high

D. very low

4556. A parallel AC. circuit in resonance will__________?
0

A. have current in each section equal to the line current

B. have a high impedance

C. have a high voltage developed across each inductive and capacitive section

D. act like a resistor of low value

4557. Skin effect occurs when a conductor carries current at_______ frequencies
0

A. very low

B. medium

C. high

D. low

4558. Which of the following coil will have large resonant frequency __________?
0

A. A coil with large distributed capacitance

B. A coil with large resistance

C. A coil with low resistance

D. A coil with low distributed capacitance

4559. The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is__________?
0

A. 12 kW

B. 22 kW

C. 64 kW

D. 32 kW

4560. All definitions of power factor of a series R-L-C circuit are correct except__________?
0

A. ratio of net reactance and impedance

B. ratio of W and VA

C. ratio of kW and kVA

D. ratio of J and Z

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