Capacitance and Capacitors MCQ Part 2

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Electrical Engineering MCQs on Capacitance and Capacitors – Also see Complete List of Capacitor MCQs

The trimmer is type of variable capacitor in which capacitance is changed by changing

The trimmer is type of variable capacitor in which capacitance is changed by changing:

  1. Plate area
  2. Distance between plates
  3. Dielectric
  4. 1 & 3

Correct answer: 2. Distance between plates

Five time constants are required for a capacitor to charge fully or discharge fully

Five time constants are required for a capacitor to charge fully or discharge fully:

  1. True
  2. False

Correct answer: 1. True

A 12 kHz voltage is supplied to a 0.33 µF capacitor, the rms current being measured is 200 mA. The voltage is

A 12 kHz voltage is supplied to a 0.33 µF capacitor, the rms current being measured is 200 mA. The voltage is:

  1. 64 V
  2. 122.5 V
  3. 0.48 V
  4. 8 V

Correct answer: 4. 8 V

A sine wave generator is supplying to a series capacitor and resistor. The frequency is set in a way that the capacitive reactance equals resistance. If the frequency is increased

A sine wave generator is supplying to a series capacitor and resistor. The frequency is set in a way that the capacitive reactance equals resistance. If the frequency is increased

  1. VC > VR
  2. VR = VC
  3. VR > VC
  4. VR and VC = 0

Correct answer: 1. VR > VC

Explanation: When frequency is set in a way that the capacitive reactance equals resistance an equal amount of voltage appears across both components.

A 220 Ω resistor is connected in series with a 2.2 µF capacitor. The time constant is

A 220 Ω resistor is connected in series with a 2.2 µF capacitor. The time constant is

  1. 1.42 µs
  2. 242 µs
  3. 480 µs
  4. 598 µs

Correct answer: 3. 480 µs

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