Electromagnetic Field MCQs with answers Page - 3

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Q. Which of the following capacitors is marked for polarity ?

  • (A) Air
  • (B) Paper
  • (C) Mica
  • (D) Electrolytic

A

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Q. Which of the following capacitors can be used for temperature compensation ?

  • (A) Air capacitor
  • (B) Ceramic capacitor
  • (C) Paper capacitor
  • (D) None of the above

A

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Q. Which of the following statements is incorrect ?

  • (A) The thinner the dielectric, the more the capacitance and the lower the voltage breakdown rating for a capacitor .
  • (B) A six dot mica capacitor colour coded white, green, black, red and yellow has the capacitance value of 500 pF
  • (C) Capacitors in series provide less capacitance but a higher voltage breakdown rating for the combina¬tion
  • (D) A capacitor can store charge be¬cause it has a dielectric between two conductors

A

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Q. Paper capacitors usually have a tolerance of

  • (A) ± 5%
  • (B) ± 10%
  • (C) ± 15%
  • (D) ± 20%

A

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Q. For closer tolerances which of the following capacitors is usually preferred ?

  • (A) Paper capacitor
  • (B) Mica capacitor
  • (C) Ceramic disc capacitor
  • (D) None of the above

A

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Q. The electrostatic force between two charges of one coulomb each and placed at distance of 0.5 m will be

  • (A) 36 x 10fa
  • (B) 36 x 107 N
  • (C) 36 x 108 N
  • (D) 36 x 109 N

A

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Q. The units of volume charge density are

  • (A) Coulomb/metre
  • (B) Coulomb/metre
  • (C) Coulomb/metre
  • (D) Coulomb/metre

A

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Q. Dielectric strength of mica is

  • (A) 10 to 20 kV/mm
  • (B) 30 to 50 kV/mm
  • (C) 50 to 200 kV/mm
  • (D) 300 to 500 kV/mm

A

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Q. The dielectric constant (relative permittivity) of glass is given by

  • (A) 0.1 to 0.4
  • (B) 0.5 to 1.0
  • (C) 2.0 to 4.0
  • (D) 5 to 100

A

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Q. capacitors are mainly used for radio frequency tuning.

  • (A) Paper
  • (B) Air
  • (C) Mica
  • (D) Electrolytic

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