electrical engineering MCQs – Page 88

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 Review each marked answer and report any item that may be outdated or unclear.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
1741. Hysteresis loss least depends on____________?
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A. volume of material

B. ambient temperature

C. frequency

D. steinmetz coefficient of material

1742. Those materials are well suited for making permanent magnets which have ________ retentivity and _________ coercivity
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A. high, low

B. low, high

C. high, high

D. low, low

1743. In mercury arc rectifiers having grid, the arc can be struck between anode and cathode only when the grid attains a certain potential, this potential being known as______________?
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A. critical grid voltage

B. maximum grid voltage

C. any of the above

D. none of the above

1744. While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit ?
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A. Current density

B. Conductivity

C. E.m.f.

D. Current
1745. The units of volume charge density are___________?
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A. Coulomb/meter

B. Coulomb/meter

C. Coulomb/meter

D. Coulomb/meter
1746. Electric field intensity is a quantity_____________?
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A. scalar

B. vector

C. both A. and (6)

D. none of the above

1747. On which of the following factors the number of phases for which a rectifier should be designed depend ?
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A. The voltage regulation of the rectifier should be low

B. all of the above

C. In the output circuit there should be no harmonics

D. The rectifier supply transformer should be utilized to the best ad-vantage

E. The power factor of the system should be high

1748. Permeability in a magnetic circuit corresponds to________ in an electric circuit
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A. resistance

B. conductance

C. conductivity

D. resistivity

1749. A paper capacitor is usually available in the form of_____________?
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A. rolled foil

B. tubes

C. meshed plates

D. disc

1750. If a third equal and similar charge is placed between two equal and similar charges, then this third charge will_____________?
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A. not be in equilibrium

B. move out of the field of influence of the two charges

C. remain in stable equilibrium

D. be in unstable equilibrium

1751. Ageing of a selenium rectifier may change the output voltage by__________?
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A. none of the above

B. 5 to 10 per cent

C. 15 to 20 per cent

D. 25 to 30 per cent

1752. A dielectric material must be____________?
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A. good conductor

B. semi conductor

C. insulator

D. resistor

1753. The efficiency of an electrolytic rectifier is nearly____________?
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A. 70%

B. 60%

C. 80%

D. 40%

1754. at a point is equal to the negative potential gradient at that point?
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A. Electric flux

B. Magnetic flux density

C. Magnetic flux

D. Electric intensity
1755. The co-efficient of coupling between two air core coils depends on____________?
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A. none of the above

B. mutual inductance between two coils only

C. self-inductance of two coils only

D. mutual inductance and self inductance of two coils
1756. Mica capacitors are characterized by all of the following except___________?
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A. accurate value

B. low leakage reactance

C. low losses

D. stable operation

1757. The value of dielectric constant for vacuum is taken as____________?
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A. 10

B. 1

C. zero

D. 4

1758. The time constant and R-C circuit may also be defined as the time during which the charging current falls to ________ percent of its initial maximum value
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A. 42

B. 63

C. 37

D. 73

1759. Paper capacitors usually have a tolerance of___________?
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A. 10%

B. 15%

C. 20%

D. 5%

1760. Cells are connected in parallel to__________?
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A. increase the voltage output

B. increase the current capacity

C. increase the internal resistance

D. increase the efficiency