electrical engineering MCQs – Page 224

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 Review each marked answer and report any item that may be outdated or unclear.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
4461. Another name for Zener diode is ______________diode?
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A. Voltage

B. Power

C. Breakdown

D. Current

4462. In a loaded Zener regulator, which is the largest Zener current ?
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A. None of the above

B. Series current

C. Load current

D. Zener current

4463. The peak value of a sine wave is 200 V. Its average value is___________?
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A. 127.4 V

B. 200V

C. 141.4 V

D. 282.8 V

4464. In a series resonant circuit, the impedance of the circuit is___________?
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A. maximum

B. minimum

C. none of the above

D. zero

4465. In a highly capacitive circuit the__________?
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A. reactive power is more than the apparent power

B. reactive power is more than the actual power

C. actual power is more than its reactive power

D. apparent power is equal to the actual power

4466. The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of_______degrees?
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A. 30

B. 90

C. 60

D. 45
4467. In a circuit containing R, L and C, power loss can take place in____________?
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A. L only

B. C only

C. all above

D. R only
4468. Two waves of the same frequency have opposite phase when the phase angle between them is_________?
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A. 90

B. 360

C. 0

D. 180
4469. Power factor of an inductive circuit is usually improved by connecting capacitor to it in____________?
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A. series

B. parallel

C. none of the above

D. either A. or (b)

4470. The power consumed in a circuit element will be least when the phase difference between the current and voltage is__________?
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A. 0

B. 60

C. 90

D. 180?

4471. Form factor for a sine wave is________?
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A. 1.414

B. 1.11

C. 0.637

D. 0.707

4472. For the same peak value which of the following wave will have the highest r.m.s. value?
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A. sine wave

B. triangular wave

C. half wave rectified sine wave

D. square wave
4473. For a sine wave with peak value Emax _______ 8.30. the average value is?
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A. 0.434 EWc

B. lAUEmax

C. 0.636 Emax

D. 0.707 Emax

4474. The form factor is the ratio of_______?
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A. peak value to r.m.s. value

B. none of the above

C. r.m.s. value to average value

D. average value to r.m.s. value

4475. The double energy transient occur in the____________?
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A. R-L-C circuit

B. R-C circuit

C. purely inductive circuit

D. R-L circuit

4476. For the same peak value, which of the following wave has the least mean value ?
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A. half wave rectified sine wave

B. sine wave

C. square wave

D. triangular wave

4477. Power factor of an electrical circuit is equal to____________?
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A. all of these

B. cosine of phase angle difference be-tween current and voltage

C. ratio of useful current to total current Iw/I

D. R/Z

E. kW/kVA

4478. Power factor of the following circuit will be zero__________?
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A. resistance

B. inductance

C. capacitance

D. both B. and C.
4479. All the rules and laws of D.C. circuit also apply to A.C. circuit containing_____________?
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A. all above

B. capacitance only

C. resistance only

D. inductance only

4480. Pure inductive circuit____________?
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A. does not take power at all from a line

B. none of the above

C. takes power from the line during some part of the cycle and then returns back to it during other part of the cycle

D. consumes some power on average