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Top 10 Capacitor MCQs with Brief Explanatory Answers

Top 10 Capacitor MCQs with Brief Explanatory Answers

A capacitor is an electric device that stores electrical energy in an electric field. It is a two-terminal passive electronic component. Capacitors are widely employed in electrical and electronic applications. They are used in electronic systems for applications like signal conditioning and timing. Popular practical applications of capacitors involve crossover networks in the speaker systems to separate high- and low-frequency signals. They are used in cameras to store the charge that fires the photoflash. Another important and common application of capacitors is in pump and refrigeration motors in order to increase starting torque. Besides residential applications in the power industry, they are used in electric power systems to increase operating efficiency. MCQ.net presents the top 20 capacitor MCQs with brief explanatory answers and solutions.

Which of the following can be used as dielectric in capacitor

Which of the following can be used as dielectric in capacitor:

  1. Air
  2. Oil
  3. Mica
  4. Plastic
  5. All of these

Correct answer: 5. All of these

Explanation: A capacitor comprises of  two metal plates separated by a nonconducting material (an insulator) called a dielectric. The dielectric may be air, oil, mica, plastic, ceramic, or other suitable insulating material.

SI Unit of capacitance is

SI Unit of capacitance is:

  1. Farad
  2. Henry
  3. Ohms
  4. Tesla

Correct answer: 1. Farad

For a given voltage, the larger the value of C

For a given voltage, the larger the value of C:

  1. The lesser the charge that a capacitor can hold
  2. The more the charge that a capacitor can hold
  3. Charge has no effect on capacitance
  4. None of these

Correct answer: 2. The more the charge that a capacitor can hold

The charge stored by a 10 µF capacitance when connected to 12 V source is

The charge stored by a 10 µF capacitance when connected to 12 V source is:

  1. 1.2 µC
  2. 10 µC
  3. 12 µC
  4. 120 µC

Correct answer: 4. 120 µC

Explanation:  Q = CV = 10 X 10-6 X12 V = 120 µC

Generally, for a fixed separation, the capacitance of a capacitor is

Generally, for a fixed separation, the capacitance of a capacitor is:

  1. Directly proportional to plate area
  2. Inversely proportional to plate area
  3. Any of above
  4. None of these

Correct answer: 1. Directly proportional to plate area

The capacitance of a parallel plate capacitor is

The capacitance of a parallel plate capacitor is:

  1. Directly proportional to plate spacing
  2. Inversely proportional to plate spacing
  3. Any of above
  4. None of above

Correct answer: 2. Inversely proportional to plate spacing

Keeping all other factors same, if air dielectric is replaced by ceramic, the capacitance increases up to

Keeping all other factors same, if air dielectric is replaced by ceramic, the capacitance increases up to:

  1. 0.0004 times
  2. 1.85 times
  3. 10 times
  4. 7500 times

Correct answer: 4. 7500 times

Explanation: The capacitance of a capacitance is dependent on the dielectric medium. Considering air as base material, if different materials are substituted, the capacitance of capacitor increases. The factor by which capacitance of parallel plate capacitor increases is known as relative permittivity of material. Relative permittivity of a few materials are given below:

  • Vacuum: 1
  • PTFE/Teflon: 2.1
  • Carbon disulphide: 2.6
  • Mica: 3–6
  • Natural rubber: 7
  • Calcium copper titanate : 250,000

The nominal capacitance of paper capacitors is around:

The nominal capacitance of paper capacitors is around:

  1. 0.1uF to 1uF
  2. 0.01uF to 1uF
  3. 0.001uF to 10uF
  4. 0.5uF to 100uF

Correct answer: 3. 0.001uF to 10uF

The correct relationship between frequency, capacitance, and capacitive reactance XC of a capacitor is given by

The correct relationship between frequency, capacitance, and capacitive reactance XC of a capacitor is given by:

  1. Capacitance reactance (XC) = 1/2πfC
  2. Capacitance reactance (XC) = 1/2πf
  3. Capacitance reactance (XC) = 1/2fC
  4. Capacitance reactance (XC) = 1/4πfC

Correct answer: 1. Capacitance reactance (XC) = 1/2πfC

Supercapacitors are sometimes also known as

Supercapacitors are sometimes also known as

  1. Ultracapacitors
  2. Electrical double-layer capacitors
  3. Both of these
  4. None of the above

Correct answer: 3. Both of these

Explanation: Supercapacitors or ultracapacitors are electrochemical energy storage devices. These capacitors store and release energy by reversible adsorption and desorption of ions at the interfaces between electrode materials and electrolytes. They are different from conventional capacitors in terms of their fast charge–discharge rates, longer life cycle, high power, and high energy density.

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