Capacitor MCQs | Capacitor Multiple Choice Questions with Answers

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Questions
1 Capacitor is a device used to__________
A store electrical energy
B vary the resistance
C store magnetic energy
D dissipate energy

Answer: store electrical energy
2 Capacitor blocks__________ after long time.
A alternating current
B direct current
C both alternating and direct current
D neither alternating nor direct current

Answer: direct current
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3 Which of the following is a passive device?
A Transistor
B Rectifier
C Capacitor
D Vaccuum Tubes

Answer: Capacitor

Multiple Choice Questions with Answers on Capacitor | EBook

4 For which medium capacitance is high?
A Air
B Mica
C Water
D Metal

Answer: Metal
5 A capacitor using chemical reactions to store charge is _______
A Paper capacitor
B Ceramic capacitor
C Polyester capacitor
D Electrolyte capacitor

Answer: Electrolyte capacitor
6 In a variable capacitor, capacitance can be varied by ______
A Turning the rotatable plates in or out
B Sliding the rotatable plates
C Changing the plates
D Changing the material of plates

Answer: Turning the rotatable plates in or out
7 Capacitor preferred when there is high frequency in the circuits is _______
A Electrolyte capacitor
B Mica capacitor
C Air capacitor
D Glass capacitor

Answer: Mica capacitor
8 Which capacitors relatively costly?
A Electrolyte capacitor
B Mica capacitor
C Air capacitor
D Glass capacitor

Answer: Mica capacitor
9 A power factor of a circuit can be improved by placing which, among the following, in a circuit?
A Inductor
B Capacitor
C Resistor
D Switch

Answer: Capacitor
10 Calculate the time constant of a series RC circuit consisting of a 100microF capacitor in series with a 100ohm resistor.
A 0.1 sec
B 0.1 msec
C 0.01 sec
D 0.01 msec

Answer: 0.01 sec
11 Air has a dielectric constant of ___________
A Unity
B Zero
C Infinity
D Hundred

Answer: Unity
12 Unit of capacitance is___________
A Volts
B Farad
C Henry
D Newton

Answer: Farad
13 Which among the following equations is incorrect?
A Q=CV
B Q=C/V
C V=Q/C
D C=Q/V

Answer: Q=C/V
14 Capacitance is directly proportional to__________
A Area of cross section between the plates
B Distance of separation between the plates
C Both area and distance
D Neither area nor distance

Answer: Area of cross section between the plates
15 What will happen to the capacitor just after the source is removed?
A It will not remain in its charged state
B It will remain in its charged state
C It will start discharging
D It will become zero

Answer: It will remain in its charged state
16 What is the value of capacitance of a capacitor which has a voltage of 4V and ha 8C of charge?
A 2F
B 4F
C 6F
D 8F

Answer: 2F
17 Capacitors charge and discharge in __________ manner.
A Linear
B Constant
C Square
D Exponential

Answer: Exponential
18 When the supply frequency increases, what happens to the capacitive reactance in the circuit?
A Increases
B Decreases
C Remains the same
D Becomes zero

Answer: Decreases
19 ______________ capacitors have a high leakage voltage.
A Electrolyte capacitor
B Variable capacitor
C Air capacitor
D Polyester capacitor

Answer: Polyester capacitor
20 ____________ capacitors usually have a colour code to find its value.
A Electrolyte capacitor
B Variable capacitor
C Polyester capacitor
D Glass capacitor

Answer: Polyester capacitor
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