Basic Electronics Engineering Questions and Answers – Passive Circuit Components – Capacitors

This set of Basic Electronics Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Passive Circuit Components – Capacitors”.

1. A capacitor is a _____two terminal electrical component.
a) Active
b) Device
c) Passive
d) Field
View Answer

Answer: c
Explanation: A capacitor is having two terminals and that is passive and it mainly stores the electric energy in an electric field. The capacitor’s effect is called as capacitance. Elastance is the reciprocal of the capacitance and its units are reciprocal of farad that is daraf.

2. What is the electronic device symbol of the polarized capacitor?
a) basic-electronics-engineering-questions-answers-capacitors-q2-a
b) basic-electronics-engineering-questions-answers-capacitors-q2-b
c) basic-electronics-engineering-questions-answers-capacitors-q2-c
View Answer

Answer: b
Explanation: The symbol of the fixed capacitor is basic-electronics-engineering-questions-answers-capacitors-q2-a and the symbol of the variable capacitor is basic-electronics-engineering-questions-answers-capacitors-q2-c and the symbol of the polarized capacitor is basic-electronics-engineering-questions-answers-capacitors-q2-b .The symbol of the battery is the basic-electronics-engineering-questions-answers-capacitors-q2-d.

3. Capacitor earlier known as _____
a) Electric condenser
b) Electronic condenser
c) Dielectric condenser
d) Di electronic condenser
View Answer

Answer: a
Explanation: In olden days the capacitor is known as the electric condenser. It is so called because the capacitor is used for inverting the dielectric material. Ceramic, glass, plastics are the examples of the dielectric materials.

4. The metallic plates in capacitor are separated by_____
a) Vacuum
b) Dielectric medium
c) Air medium
d) Water medium
View Answer

Answer: b
Explanation: The metallic plates are separated by a distance in the capacitor. The medium in the separation is dielectric medium which allows the alternating current. Dielectric field contains some static electricity and due to this the plates behaves as the insulators.

5. A conductor may not be in the form of____
a) Foil
b) Carbon
c) Thin film
d) Electrolyte
View Answer

Answer: b
Explanation: The capacitor is may be in the form of foil, thin film, sintered bead of metal or an electrolyte. The dielectric medium is like glass, ceramic, plastic or mica. It is a passive device and stores only some current in it.

6. The non-conducting dielectric acts to increase the capacitor’s _______
a) Charge capacity
b) Electric field
c) Efficiency
d) Voltage
View Answer

Answer: a
Explanation: The charge capacity of the capacitor is increased by non-conducting dielectric materials. The resistor dissipates energy but the capacitors do not dissipate. Resistors are used to reduce the electric current but capacitor stores the electricity.

7. If time-lagging voltage is applied across the leads of capacitor, the source experiences an _____current.
a) Lagging
b) Leading
c) On going
d) Out going
View Answer

Answer: c
Explanation: The ongoing current will be produced for the source when the leads are applied a lagging current. This is due to the charging and discharging cycles of the capacitor. It goes on alternately and continuously.

8. Capacitance can be defined as the ratio of the electric charge on each conductor to the ______ between them.
a) Voltage difference
b) Potential energy
c) Electric difference
d) Potential difference
View Answer

Answer: d
Explanation: The capacitance is the ratio of the electric charge to the potential difference that why the units of the capacitance is coulomb/volts. The units of the electric charge are coulomb and the potential difference units are volts.

9. The units of capacitance is______
a) Henry
b) Coulomb
c) Farad
d) Newton
View Answer

Answer: c
Explanation: Henry is the unit of the inductance. The unit of electric charge is coulomb and the unit of the capacitance is farad. The unit of the force is newton. The unit of the Elastance is the daraf as it is the inverse of the capacitance.

10. The dielectric between the plates passes a small amount of_______
a) Leakage current
b) Direct current
c) Alternating current
d) Voltage
View Answer

Answer: a
Explanation: Actually, the dielectric medium blocks the direct current and allows alternating current but here the small amount of leakage current passes. Mostly, the alternating current is allowed to flow inside the circuit.

11. The limited electric field strength is known as the____
a) Short circuit voltage
b) Breakdown voltage
c) Open circuit voltage
d) High voltage
View Answer

Answer: b
Explanation: The maximum energy that can be stored in a capacitor is limited by the breakdown voltage. So, it is called as breakdown voltage. Breakdown voltage is the minimum voltage od insulator to make it conductive.

12. Capacitor blocks the _____
a) Open circuit current
b) Alternating current
c) Short circuit current
d) Voltage
View Answer

Answer: d
Explanation: The capacitor blocks the direct current. It only allows the alternating current and the short circuit is not done. If short circuit is done then there will be no flow of current in the circuit. Open circuit is also not possible.

13. The property of energy storage in capacitor was exploited as______
a) Logical memory
b) Dynamic memory
c) Arithmetic memory
d) Internal memory
View Answer

Answer: b
Explanation: Capacitors was exploited the dynamic memory. This property made them to use them in computers. They are used to store the data and information. They also used in the mother board of the computers and many other components of the computers.

Sanfoundry Global Education & Learning Series – Basic Electronics Engineering.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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