electrical engineering MCQs – Page 89

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 Review each marked answer and report any item that may be outdated or unclear.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
1761. Petroleum jelly is applied to the electrical connections to the lead-acid battery___________?
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A. reduce path resistance

B. prevent short-circuiting

C. prevent local heating

D. prevent corrosion
1762. The bridge used for the measurement of the value of the capacitance is____________?
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A. Wheatstone bridge

B. Wiens bridge

C. Schering bridge

D. Hays bridge

1763. A mica capacitor and a ceramic capacitor both have the same physical dimensions. Which will have more value of capacitance _______?
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A. Ceramic capacitor

B. Mica capacitor

C. Both will have identical value of capacitance

D. It depends on applied voltage

1764. In order to remove static electricity from machinery___________?
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A. humidify the surroundings

B. construct insulated cabins

C. insulate the machinery

D. ground the framework
1765. A typical output of a solar cell is_____________?
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A. 0.1V

B. 0.26 V

C. 2 V

D. 1.1 V

1766. The efficiency of the copper oxide rectifier seldom exceeds____________?
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A. 65 to 75%

B. 80 to 85%

C. 85 to 90%

D. 90 to 95%

1767. The law that the induced e.m.f. and current always oppose the cause producing them is due to____________?
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A. Lenz

B. Newton

C. Coulomb

D. Faraday

1768. In a capacitive circuit___________?
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A. none of the above

B. a steady value of applied voltage causes discharge

C. an increase in applied voltage makes a capacitor charge

D. decrease in applied voltage makes a capacitor charge

1769. A material for good magnetic memory should have____________?
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A. high retentivity

B. low retentivity

C. high permeability

D. low hysteresis loss

1770. It is the_________of the transformer on which the magnitude of angle of overlap depends?
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A. any of the above

B. leakage reactance

C. resistance

D. capacitance

1771. If A.C. voltage is applied to capacitive circuit, the alternating current can flow in the circuit because__________________?
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A. varying voltage produces the charging and dicharging currents

B. charging current can flow

C. of high peak value

D. discharge current can flow

1772. The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface. The above statement is associated with_______?
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A. Gausss law

B. Lenzs law

C. Kirchhoff s law

D. Faradays law

1773. Permittivity is expressed in_____________?
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A. Farad/sq-m

B. Weber/sq-m

C. Weber/meter

D. Farad/meter
1774. What is the value of capacitance that must be connected in parallel with 50 pF condenser to make an equivalent capacitance of 150 pF ?
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A. 200 pF

B. 150 pF

C. 100 pF

D. 50 pF

1775. Which of the fpllowing inductor will have the least eddy current losses ?
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A. Air core

B. Laminated iron core

C. Powdered iron core

D. Iron core

1776. In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be____________?
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A. 1.0

B. zero

C. 0.5

D. 2

1777. Dielectric strength of mica is___________?
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A. 300 to 500 kV/mm

B. 30 to 50 kV/mm

C. 50 to 200 kV/mm

D. 10 to 20 kV/mm

1778. An electrolytic capacitor is generally made to provide__________?
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A. fixed capacitance

B. low capacitance

C. large value of capacitance

D. variable capacitance

1779. If three 15 uF capacitors are connected in series, the net capacitance is
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A. 30 uF

B. 5 uF

C. 45 uF

D. 50 uF

1780. Out of the following capacitors of identical rating which one will have the smallest dimensions ___________ ?
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A. Ceramic capacitor

B. Mica capacitor

C. Paper capacitor

D. Aluminium foil capacitor