electrical engineering MCQs – Page 82

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 Review each marked answer and report any item that may be outdated or unclear.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
1621. The disadvantage with paper as insulating material is____________?
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A. it is an organic material

B. it is hygroscopic

C. none of the above

D. it has high capacitance

1622. Internal resistance of a cell is reduced by__________?
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A. increasing the plate area

B. using vent plug to permit gas formed during discharge

C. putting plates very close together

D. all above methods
1623. Power factor of the system is kept high__________?
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A. to reduce line losses

B. due to all above reasons

C. to maximise the utilization of the capacities of generators, lines and transformers

D. to reduce voltage regulation of the line

1624. Aphasoris________?
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A. a coloured tag or band for distinction between different phases of a 3-phase supply

B. a line representing the magnitude and direction of an alternating quantity

C. an instrument used for measuring phases of an unbalanced 3-phase load

D. a line which represents the magnitude and phase of an alternating quantity
1625. In the cables, the location of fault is usually found out by comparing____________?
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A. the resistance of the conductor

B. the inductance of conductors

C. the capacitances of insulated conductors

D. all above parameters

1626. The purpose of a parallel circuit resonance is to magnify________?
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A. power

B. current

C. voltage

D. frequency

1627. Which of the following protects a cable against mechanical injury___________?
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A. Bedding

B. Armouring

C. Sheath

D. None of the above

1628. The time constant of a series R-C circuit is given by____________?
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A. R2C

B. R/C

C. RC

D. RC2

1629. Cables, generally used beyond 66 kV are___________?
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A. armoured

B. oil filled

C. S.L. type

D. belted

1630. Charging a sulphated battery at high rate results in___________?
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A. warping of plates

B. boiling of electrolyte due to gassing

C. all above

D. damage to separators, cell caps covers and battery case due to excessive temperature

1631. The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is_________?
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A. 8 kVAR

B. 16 kVAR

C. 6 kVAR

D. 4 kVAR

1632. The current flow through electrolyte is due to the movement of____________?
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A. none of the above

B. holes

C. ions

D. electrons

1633. The time constant of the capacitance circuit is defined as the time during which voltage________?
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A. rises to 63.2% of its final steady value

B. falls to 36.8% of its final steady value

C. none of the above

D. rises to 38.6% of its final steady value

1634. During charging the specific gravity of the electrolyte of a lead-acid battery
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A. increases

B. becomes zero

C. decreases

D. remains the same

1635. Natural rubber is obtained from milky sap of tropical trees
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A. Yes

B. No

1636. cables are used for 132 kV lines____________?
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A. High tension

B. Extra high tension

C. Extra super voltage

D. Super tension

1637. Power factor of the following circuit will be zero__________?
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A. resistance

B. inductance

C. capacitance

D. both B. and C.
1638. In capacitance grading of cables we use a _______ dielectric?
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A. composite

B. hygroscopic

C. porous

D. homogeneous

1639. The ampere-hour efficiency of a lead acid cell is normally between_________?
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A. 20 to 30%

B. 60 to 70%

C. 40 to 50%

D. 90 to 95%
1640. It is noticed that during discharging the following does not happen___________?
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A. both anode and cathode become PbS04

B. specific gravity of H2SO4 decreases

C. voltage of the cell decreases

D. the cell absorbs energy