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MCQs

Total Questions : 330 | Page 19 of 33 pages
Question 181. The electric fields of dielectrics having the same cross sectional area in series are related to their relative permittivities in which way?
  1.    Directly proportional
  2.    Inversely proportional
  3.    Equal
  4.    Not related
 Discuss Question
Answer: Option B. -> Inversely proportional
Answer: (b).Inversely proportional
Question 182. Potential drop in a dielectric is equal to _______
  1.    Electric field strength*thickness
  2.    Electric field strength*area of a cross section
  3.    Electric field strength
  4.    Zero
 Discuss Question
Answer: Option A. -> Electric field strength*thickness
Answer: (a).Electric field strength*thickness
Question 183. A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the initial value of the discharge current.
  1.    10A
  2.    0A
  3.    Infinity
  4.    20A
 Discuss Question
Answer: Option B. -> 0A
Answer: (b).0A
Question 184. A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the initial value of charging current.
  1.    10A
  2.    0A
  3.    Infinity
  4.    20A
 Discuss Question
Answer: Option D. -> 20A
Answer: (d).20A
Question 185. A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the final value of the discharge current.
  1.    10A
  2.    0A
  3.    Infinity
  4.    20A
 Discuss Question
Answer: Option D. -> 20A
Answer: (d).20A
Question 186. What happens to the capacitor when the capacitor voltage is equal to the source voltage?
  1.    The charging phase of the capacitor is over
  2.    The discharging phase of the capacitor is over
  3.    The capacitor is switched off
  4.    The capacitor is switched on
 Discuss Question
Answer: Option C. -> The capacitor is switched off
Answer: (c).The capacitor is switched off
Question 187. When will be capacitors fully charged?
  1.    When voltage is zero
  2.    When the supply voltage is equal to the capacitor voltage
  3.    When voltage is infinity
  4.    When capacitor voltage is equal to half the supply voltage
 Discuss Question
Answer: Option B. -> When the supply voltage is equal to the capacitor voltage
Answer: (b).When the supply voltage is equal to the capacitor voltage
Question 188. A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the final value of charging current.
  1.    10A
  2.    0A
  3.    Infinity
  4.    20A
 Discuss Question
Answer: Option B. -> 0A
Answer: (b).0A
Question 189. A circuit has a resistance of 5 ohm connected in series with a capacitance of 10F. Calculate the discharging time constant.
  1.    15
  2.    50
  3.    5
  4.    10
 Discuss Question
Answer: Option B. -> 50
Answer: (b).50
Question 190. The discharging time constant of a circuit consisting of a capacitor is the time taken for the charge in the capacitor to become __________ % of the initial charge.
  1.    33
  2.    63
  3.    37
  4.    36
 Discuss Question
Answer: Option C. -> 37
Answer: (c).37

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