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MCQs

Total Questions : 330 | Page 13 of 33 pages
Question 121. What is the voltage across a capacitor at the time of switching, that is, when t=0?
  1.    Infinity
  2.    0V
  3.    Cannot be determined
  4.    1V
 Discuss Question
Answer: Option B. -> 0V
Answer: (b).0V
Question 122. Which among the following expressions relate charge, voltage and capacitance of a capacitor?
  1.    Q=C/V
  2.    Q=V/C
  3.    Q=CV
  4.    C=Q²V
 Discuss Question
Answer: Option C. -> Q=CV
Answer: (c).Q=CV
Question 123. If one plate of a parallel plate capacitor is charged to positive charge the other plate is charged to?
  1.    Positive
  2.    Negative
  3.    Positive or negative
  4.    Not charged
 Discuss Question
Answer: Option B. -> Negative
Answer: (b).Negative
Question 124. Calculate the capacitance of a capacitor that stores 40microC of charge and has a voltage of 2V.
  1.    20F
  2.    20microF
  3.    10F
  4.    10microF
 Discuss Question
Answer: Option B. -> 20microF
Answer: (b).20microF
Question 125. What happens to the current flow in a fully charged capacitor?
  1.    Current flow stops
  2.    Current flow doubles
  3.    Current flow becomes half its original value
  4.    Current flow becomes one-fourth its original value
 Discuss Question
Answer: Option A. -> Current flow stops
Answer: (a).Current flow stops
Question 126. When the voltage across a capacitor increases, what happens to the charge stored in it?
  1.    Increases
  2.    Decreases
  3.    Becomes zero
  4.    Cannot be determined
 Discuss Question
Answer: Option A. -> Increases
Answer: (a).Increases
Question 127. When will capacitor fully charged?
  1.    When the voltage across its plates is half the voltage from ground to one of its plates
  2.    When the current through the capacitor is a 1/√2 time its value
  3.    When the supply voltage is equal to the capacitor voltage
  4.    Never
 Discuss Question
Answer: Option C. -> When the supply voltage is equal to the capacitor voltage
Answer: (c).When the supply voltage is equal to the capacitor voltage
Question 128. What is the value of current in a discharging capacitive circuit if the initial current is 2A at time t=RC.
  1.    0.74A
  2.    1.26A
  3.    3.67A
  4.    2.89A
 Discuss Question
Answer: Option B. -> 1.26A
Answer: (b).1.26A
Question 129. What is the value of current in a charging capacitive circuit if the initial current is 2A at time t=RC.
  1.    0.74A
  2.    1.26A
  3.    3.67A
  4.    2.89A
 Discuss Question
Answer: Option A. -> 0.74A
Answer: (a).0.74A
Question 130. While charging, what happens to the current in the capacitive circuit?
  1.    Decreases linearly
  2.    Increases linearly
  3.    Decreases exponentially
  4.    Increases exponentially
 Discuss Question
Answer: Option C. -> Decreases exponentially
Answer: (c).Decreases exponentially

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