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MCQs

Total Questions : 330 | Page 21 of 33 pages
Question 201. An 8microF capacitor is connected in series with a 0.5 megaohm resistor. The DC voltage supply is 200V. Calculate the voltage in the capacitor 4s after the power is supplied.
  1.    123.4V
  2.    126.4V
  3.    124.5V
  4.    132.5V
 Discuss Question
Answer: Option B. -> 126.4V
Answer: (b).126.4V
Question 202. A 8 microF capacitor is connected in series with a 0.5 megaohm resistor. The DC voltage supply is 200V. Calculate the time taken for the potential difference across the capacitor to grow to 160V.
  1.    6.93s
  2.    7.77s
  3.    2.33s
  4.    3.22s
 Discuss Question
Answer: Option A. -> 6.93s
Answer: (a).6.93s
Question 203. If the charge in a capacitor is 4C and the energy stored in it is 4J, find the value of capacitance.
  1.    2F
  2.    4F
  3.    8F
  4.    16F
 Discuss Question
Answer: Option A. -> 2F
Answer: (a).2F
Question 204. When the area of cross section of the plate increases, what happens to the force between the plates?
  1.    Increases
  2.    Decreases
  3.    Remains the same
  4.    Becomes zero
 Discuss Question
Answer: Option A. -> Increases
Answer: (a).Increases
Question 205. When the potential gradient increases, what happens to the force between the plates?
  1.    Increases
  2.    Decreases
  3.    Remains the same
  4.    becomes zero
 Discuss Question
Answer: Option A. -> Increases
Answer: (a).Increases
Question 206. Which among the following is the correct expression for force between the plates of a parallel plate capacitor?
  1.    F=epsilon*A*(V/x)²/2
  2.    F=epsilon*A*(V/x)²/3
  3.    F=epsilon (V/x)²/2
  4.    F=epsilon (V/x)²/3
 Discuss Question
Answer: Option A. -> F=epsilon*A*(V/x)²/2
Answer: (a).F=epsilon*A*(V/x)²/2
Question 207. If the charge in a capacitor is 4C and the energy stored in it is 4J, calculate the voltage across its plates.
  1.    2V
  2.    4V
  3.    8V
  4.    16V
 Discuss Question
Answer: Option A. -> 2V
Answer: (a).2V
Question 208. What happens to the force of attraction between the capacitors when the potential difference between the plates decreases?
  1.    Increases
  2.    Decreases
  3.    Remains the same
  4.    Becomes zero
 Discuss Question
Answer: Option B. -> Decreases
Answer: (b).Decreases
Question 209. What happens to the force of attraction between the capacitors when the distance of separation between the plates increases?
  1.    Increases
  2.    Decreases
  3.    Remains the same
  4.    Becomes zero
 Discuss Question
Answer: Option B. -> Decreases
Answer: (b).Decreases
Question 210. If the potential difference in a material is 4MV and the thickness of the material is 2m, calculate the dielectric strength.
  1.    2MV/m
  2.    4MV/m
  3.    6MV/m
  4.    8MV/m
 Discuss Question
Answer: Option A. -> 2MV/m
Answer: (a).2MV/m

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