electrical engineering MCQs – Page 91

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 Review each marked answer and report any item that may be outdated or unclear.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
1801. capacitors can be used only for D.C ?
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A. Mica

B. Air

C. Electrolytic

D. Paper

1802. When two batteries are connected in parallel, it should be ensured that___________?
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A. they have same ampere-hour capacity

B. they have same e.m.f.

C. they have identical internal resistance

D. they have same make

1803. The common impurity in the electrolyte of lead-acid battery is_____________?
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A. lead crystals

B. dust particles

C. iron

D. chlorine

1804. A condenser suitable for D.C. only is________?
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A. poled aluminium electrolytic condenser

B. metallic plate variable gang condenser

C. oil impregrated paper condenser

D. metallic paper capacitor

1805. In a mercury arc rectifier, the anode is usually made of_____________?
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A. graphite

B. tungsten

C. aluminium

D. silver

E. copper

1806. Energy stored in the electric field of a capacitor C when charged from a D.C source of voltage V is equal to joules_______________?
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A. CV

B. C2V

C. CV2

D. CV2
1807. Which of the following rectifiers are primarily used for charging of low voltage batteries from AC supply ?
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A. Mercury arc rectifiers

B. Electrolytic rectifiers

C. Selenium rectifiers

D. Mechanical rectifiers

E. Copper oxide rectifiers

1808. Selenium rectifier can be operated at temperatures as high as____________?
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A. 60C

B. 75C

C. 40C

D. 25C

1809. To prevent the generation of static charges on rubber or flat leather__________?
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A. conductive dressing is done

B. oil compound dressing is done

C. talcum powder is sprayed on the surface

D. surface is moistened

1810. The property of a capacitor to store electricity is called its____________?
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A. none of the above

B. capacitance

C. energy

D. charge

1811. The phenomenon of an uncharged body getting charged merely by the nearness of a charged body is known as____________?
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A. magnetic effect

B. chemical effect

C. induction

D. pholoelectric effect

1812. A gang condenser is a____________?
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A. polarised capacitor

B. variable capacitor

C. none of the above

D. ceramic capacitor

1813. The inverse of capacitance is called_______________?
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A. elastance

B. reluctance

C. conductance

D. susceptance

1814. A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be________________?
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A. 10 times greater than before

B. 25 times larger than before

C. 5 times smaller than before

D. 5 times greater than before

1815. The direction of electric field due +0 positive charge is ___________?
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A. away from the charge

B. towards the charge

C. both A. and (6)

D. none of the above

1816. The presence of an uncharged conductor near a charged one increases the__________?
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A. potential of the charged conductor

B. all of the above

C. capacity of the charged conductor

D. charge of the charged conductor

1817. The unit of reluctance is_____________?
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A. 1/henry

B. metre/henry

C. henry/metre

D. henry

1818. When a dielectric is placed in an electric field the field strength____________?
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A. increases

B. remain unchanged

C. reduces to zero

D. decreases
1819. The sparking between two electrical contacts can be reduced by inserting a___________?
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A. none of the above

B. capacitor in parallel with contacts

C. capacitor in series with each contact

D. resistance in line

1820. A commutating rectifier consists of commutator driven by___________?
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A. a D.C. shunt motor

B. an induction motor

C. a synchronous motor

D. a D.C. series motor