electrical engineering MCQs – Page 325

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 Review each marked answer and report any item that may be outdated or unclear.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 generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

6481. For frequencies below resonant frequency, a series LC circuit behaves as a _____________ load?
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A. Resistive

B. Inductive

C. None of the above

D. Capacitive

6482. For frequencies below the resonant frequency , a parallel LC circuit behaves as a ______________load?
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A. Resistive

B. None of the above

C. Capacitive

D. Inductive

6483. At parallel resonance, the line current is_______________?
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A. Quite large

B. Minimum

C. Maximum

D. None of the above

6484. If Q of an LC circuit increases, then bandwidth ______________?
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A. Decreases

B. Remains the same

C. Insufficient data

D. Increases

6485. At series resonance, the phase angle between applied voltage and circuit is______________?
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A. 90o

B. 180o

C. 0o

D. None of the above

6486. A highly conductive material must have___________?
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A. easy solderable and drawable quality

B. all of the above

C. highest conductivity

D. good corrosion resistance

E. good mechanical strength

F. lowest temperature co-efficient

6487. Which of the following is an advantage of stranded conductor over equivalent single conductor ?
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A. Less liability to break

B. Less liability to kink

C. All of the above

D. Greater flexibility

6488. Superconductors are becoming popular for use in________________?
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A. manufacture of bubble memories

B. generating regions free from magnetic field

C. generating electrostatic field

D. generating very strong magnetic field

6489. Platinum is used in_____________?
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A. electrical contacts

B. all of the above

C. thermocouple

D. grids of special purpose vacuum tubes

E. heating element in high temperature furnace

6490. Due to which of the following factors the brush wear rate is altered ?
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A. All of the above

B. Contact pressure

C. Excessive sparking

D. Speed of the machine

E. Surface conditions of brush and commutator

6491. is the property of absorbing moisture from atmosphere_____________?
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A. Viscosity

B. Hygroscopicity

C. Porosity

D. Solubility

6492. The conductivity of a metal is determined by____________?
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A. either (A) or (B)

B. the electronic concentration and the mobility of the free electrons

C. none of the above

D. the number of valence electrons per atom

6493. In thermocouples which of the following pairs is commonly used ?
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A. Silver-German silver

B. Iron-steel

C. Copper-constantan

D. Aluminium-tin

6494. For a hole which of the following statements is incorrect ?
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A. Holes can be considered as a net positive charge

B. Holes may constitute an electric current

C. Holes can exist in certain semiconductors only

D. Holes can exist in any material including conductors

6495. At transition temperature the value of critical field is____________?
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A. negative real value

B. zero

C. positive real value

D. complex value

6496. is an element used in semiconductors whose atoms have three valence electrons?
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A. Germanium

B. A donor

C. Silicon

D. An acceptor

6497. The forbidden gap in an insulator is________________?
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A. small

B. large

C. any of the above

D. nil

6498. Due to which of the following reasons aluminium does not corrode in atmosphere ?
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A. Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium

B. Aluminium is a noble metal

C. No reaction with oxygen occurs ft Any of the above

6499. Which of the following materials is used for making coils of standard resistances ?
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A. Platinum

B. Copper

C. Nichrome

D. Manganin

6500. __________ is the main constituent of glass?
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A. Fe203

B. Si02

C. AI2O3

D. B2O3

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