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MCQs

Total Questions : 441 | Page 7 of 45 pages
Question 61. Permittivity is expressed in
  1.    Farad/sq-m
  2.    Farad/meter
  3.    Weber/meter
  4.    Weber/sq-m
 Discuss Question
Answer: Option B. -> Farad/meter
Question 62. When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of
  1.    2 joules
  2.    4 joules
  3.    6 joules
  4.    8 joules
 Discuss Question
Answer: Option D. -> 8 joules
Question 63. The capacity of capacitor bank used in power factor correction is expressed in terms of
  1.    kW
  2.    kVA
  3.    kVAR
  4.    volts
 Discuss Question
Answer: Option C. -> kVAR
Question 64. For making a capacitor, it is better to select a dielectric having
  1.    low permittivity
  2.    high permittivity
  3.    permittivity same as that of air
  4.    permittivity slightly more than that of air
 Discuss Question
Answer: Option B. -> high permittivity
Question 65. When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will
  1.    remain uncharged
  2.    decrease
  3.    increase
  4.    become zero
 Discuss Question
Answer: Option B. -> decrease
Question 66. The power dissipated in a pure capacitor is
  1.    zero
  2.    proportional to applied voltage
  3.    proportional to value of capacitance
  4.    both (B) and (C) above
 Discuss Question
Answer: Option A. -> zero
Question 67. Which of the following capacitors will have the least value of breakdown voltage ?
  1.    Mica
  2.    Paper
  3.    Ceramic
  4.    Electrolytic
 Discuss Question
Answer: Option D. -> Electrolytic
Question 68. A capacitor charged to 200 V has 2000 (iC of charge. The value of capacitance will be
  1.    10 F
  2.    10 uF
  3.    100 nF
  4.    1000 uF
 Discuss Question
Answer: Option B. -> 10 uF
Question 69. In a capacitor the electric charge is stored in
  1.    metal plates
  2.    dielectric
  3.    both (A) and (B)
  4.    none of the above
 Discuss Question
Answer: Option B. -> dielectric
Question 70. The capacitance C is charged through a resistance R. The time constant of the charging circuit is given by
  1.    CIR
  2.    1/RC
  3.    RC
  4.    RIC
 Discuss Question
Answer: Option C. -> RC

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