Question 1

A capacitor is a device that will store&#10;A) charge&#10;B) energy&#10;C) current&#10;D) power

Accepted Answer

energy&#10;

Question 2

Capacitors are named according to their&#10;A) method of construction&#10;B) types of plate&#10;C) application&#10;D) dielectric

Accepted Answer

Capacitors are named according to the type of dielectric material used between the plates. Dielectric is an electrical insulator that can be polarized by an applied electric field. Different types of dielectric materials have different properties, and their use can affect the performance of the capacitor. Therefore, the correct answer is D – dielectric.

Question 3

During 'charging', a capacitor will transfer __________ from one plate to the other&#10;A) charge&#10;B) energy&#10;C) current&#10;D) voltage

Accepted Answer

During charging, a capacitor will transfer charge from one plate to the other.

Question 4

A capacitor will stop charging, when the potential difference across its plates reaches the same __________ as the external supply&#10;A) polarity&#10;B) charge&#10;C) potential&#10;D) potential difference

Accepted Answer

A capacitor is a device that stores electric charge. It charges until the potential difference across its plates reaches the same as the external supply, meaning that there is no longer a difference in potential for the charge to move across the capacitor. Therefore, the correct answer is potential difference (D).

Question 5

A charging capacitor will aquire the __________ polarity __________ the external supply voltage&#10;A) opposite, to&#10;B) same, as

Accepted Answer

A charging capacitor acquires the same polarity as the external supply voltage. When a capacitor is connected to a battery or any DC source, the plate connected to the positive terminal of the battery becomes positively charged, while the plate connected to the negative terminal becomes negatively charged, mirroring the polarity of the source.

Question 6

Energy supplied to a capacitor is stored&#10;A) in its dielectric.&#10;B) on its positive plate&#10;C) on its negative plate&#10;D) on both its plates

Accepted Answer

Energy supplied to a capacitor is stored in its dielectric because the dielectric material becomes polarized when the capacitor is charged, and this polarization stores the energy.

Question 7

By convention, the 'charge' on a capacitor is the amount of __________ charge accumulated on its __________ plate, expressed in coulombs&#10;A) positive, negative&#10;B) negative, positive&#10;C) negative, negative

Accepted Answer

The answer of By convention, the 'charge' on a capacitor...

Question 8

Doubling the area of overlap of the plates of a capacitor will __________ its capacitance&#10;A) quarter&#10;B) halve&#10;C) double&#10;D) quadruple

Accepted Answer

The capacitance of a parallel plate capacitor is given by C=εA/d, where A is the area of overlap, d is the distance between the plates, and ε is the permittivity of the material between the plates. Doubling the area of overlap, while keeping the other variables constant, will result in double the capacitance.

Question 9

Halving the distance between the plates of a capacitor will __________ its capacitance&#10;A) quarter&#10;B) halve&#10;C) double&#10;D) quaduple

Accepted Answer

The capacitance of a parallel plate capacitor is directly proportional to the area of the plates and inversely proportional to the distance between them. Halving the distance between the plates will increase the capacitance by a factor of 2.

Question 10

The __________ of the dielectric will have a great impact on the capacitance of a capacitor&#10;A) permittivity&#10;B) permeability&#10;C) dielectric strength

Accepted Answer

The permittivity of a dielectric determines its ability to store electric charge and thus impacts the capacitance of a capacitor. The higher the permittivity of the dielectric, the greater the capacitance of the capacitor. Permeability and dielectric strength are not directly related to capacitance.

Question 11

The capacitance of a capacitor is directly proportional to the&#10;A) ratio of voltage to charge&#10;B) ratio of charge to voltage&#10;C) product of charge and voltage

Accepted Answer

The answer of The capacitance of a capacitor is directly...

Question 12

The term, 'displacement current' describes the way in which the dielectric's __________ whenever the potential-difference across a capacitor's plates changes&#10;A) leakage current changes&#10;B) atoms' electron orbits polarise

Accepted Answer

The answer of The term, 'displacement current' describes the way...

Question 13

The effect of an increasing displacement current is to __________ the electric field within the dielectric&#10;A) neutralise&#10;B) increase&#10;C) decrease

Accepted Answer

The answer of The effect of an increasing displacement current...

Question 14

A __________ in a capacitor's displacement current will act to __________ its capacitance&#10;A) decrease, decrease&#10;B) decrease, increase&#10;C) rise, increase

Accepted Answer

The answer of A __________ in a capacitor's displacement current...

Question 15

A dielectric's dielectric strength __________ to its absolute permittivity&#10;A) bears no relationship&#10;B) is proportional&#10;C) is inversely-proportional

Accepted Answer

The answer of A dielectric's dielectric strength __________ to its...

Question 16

The voltage rating of a capacitor is generally expressed as a __________&#10;A) d.c. voltage&#10;B) root-mean-square a.c. voltage&#10;C) average a.c. voltage&#10;D) peak a.c. voltage

Accepted Answer

The answer of The voltage rating of a capacitor is...

Question 17

The time taken for a capacitor to fully charge is five times the __________ of a capacitive circuit&#10;A) ratio of capacitance to resistance&#10;B) ratio of resistance to capacitance&#10;C) product of resistance and capacitance

Accepted Answer

The answer of The time taken for a capacitor to...

Question 18

A capacitor always acts to oppose any change in&#10;A) current&#10;B) voltage

Accepted Answer

The answer of A capacitor always acts to oppose any...

Question 19

When calculating total capacitance, capacitors in __________ are treated like resistors in __________&#10;A) series, parallel&#10;B) series, series&#10;C) parallel, parallel

Accepted Answer

The answer of When calculating total capacitance, capacitors in __________...

Deck 16: Capacitors and Capacitance