electrical engineering MCQs – Page 87

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 Review each marked answer and report any item that may be outdated or unclear.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
1721. In case of an inductance, current is proportional to___________?
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A. voltage across the inductance

B. magnetic field

C. both A. and B.

D. neither (A) nor (B)

1722. The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is______________?
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A. 12 mH

B. 4 mH

C. 6 mH

D. 5 mH

1723. A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be___________?
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A. 48 mH

B. 24 mH

C. 14 mH

D. 6 mH

1724. 1 volt/meter is same as___________?
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A. 1 newton/meter

B. 1 newton meter

C. 1 joule/coulomb

D. 1 meter/coulomb

1725. An uncharged conductor is placed near a charged conductor, then_____________?
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A. the uncharged conductor gets charged by conduction

B. it remains as such

C. the uncharged conductor is attracted first and then charged by induction

D. the uncharged conductor gets charged by induction and then attracted towards the charging body
1726. A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is___________?
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A. 0.12 F

B. 0.8 F

C. 0.024 F

D. 0.6 F

1727. The capacity of capacitor bank used in power factor correction is expressed in terms of____________?
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A. kVA

B. volts

C. kW

D. kVAR
1728. In a capacitor, the electric charge is stored in_________?
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A. metal plates

B. dielectric

C. none of the above

D. dielectric as well as metal plates

1729. Which of the following capacitors is marked for polarity ?
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A. Paper

B. Air

C. Mica

D. Electrolytic
1730. A capacitor charged to 200 V has 2000 (iC of charge. The value of capacitance will be_____________?
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A. 1000 uF

B. 10 uF

C. 100 nF

D. 10 F

1731. Hard steel is suitable for making permanent magnets because_____________?
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A. its mechanical strength is low

B. it has good residual magnetism

C. its hysteresis loop has large area

D. its mechanical strength is high

1732. In a grid control of mercury arc rectifiers when the grid is made positive relative to cathode, then it the electrons on their may to anode.
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A. any of the above

B. none of the above

C. decelerates

D. accelerates
1733. Which of the following statements is correct ___________?
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A. Electrolytic capacitor must be connected in the correct polarity

B. Air capacitors have a black band to indicate the outside foil

C. Ceramic capacitors must be connected in the correct polarity

D. Mica capacitors are available in capacitance value of 1 to 10 pF

1734. An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is____________?
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A. 20 Wb

B. 0.2 Wb

C. 2 Wb

D. 0.02 Wb
1735. When the dielectric is homogeneous,the potential gradient is_____________?
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A. any of the above

B. zero

C. non-uniform

D. uniform
1736. The total deficiency or excess of electrons in a body is known as____________?
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A. charge

B. voltage

C. potential gradient

D. current

1737. Dielectric strength of a medium is usually expressed in____________?
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A. kV/mm

B. N/mm

C. J/mm

D. C/m2

1738. Capacitance increases with_____________?
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A. reduction in plate area and distance between the plates

B. increase in plate area and decrease in distance between the plates

C. decrease in plate area and value of applied voltage

D. increase in plate area and distance between the plates

1739. The number of Faraday tubes of flux passing through a surface in an electric field is called____________?
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A. electric flux density

B. electric charge density

C. magnetic flux density

D. electric flux
1740. Electric displacement is a__________quantity
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A. scalar

B. vector

C. both of the above

D. none of the above