Question 1

When a capacitor is connected to an alternating current circuit, current will appear to flow through the capacitor.

Accepted Answer

When an alternating current is applied to a capacitor, the capacitor charges and discharges repeatedly in each cycle of the AC waveform, appearing as if current is flowing through it. However, the actual flow of electrons is not continuous, but rather a back-and-forth motion.

Question 2

The basic unit of capacitance is the ____.&#10;A) farad&#10;B) coulomb&#10;C) henry&#10;D) volt

Accepted Answer

The basic unit of capacitance is the farad, which is defined as one coulomb of charge per volt of potential difference.

Question 3

Capacitors can produce currents of thousands of amperes for short periods of time.

Accepted Answer

Capacitors can discharge a large amount of stored energy in a short amount of time, leading to high current flow. However, this current flow is typically only sustained for a brief period before the capacitor fully discharges.

Question 4

The power value for a capacitor is reactive and is measured in VARs.

Accepted Answer

The power value for a capacitor is indeed reactive and is measured in VARs (Volt-Ampere Reactive).

Question 5

The energy of the capacitor is stored in the dielectric in the form of an ____ charge.&#10;A) electrostatic&#10;B) electromagnetic&#10;C) alternating&#10;D) inductive

Accepted Answer

When a capacitor is charged, the electric field creates an electrostatic charge separation between the plates, resulting in the storage of energy in the dielectric material between the plates. Therefore, option A, which refers to electrostatic charge, is the correct choice. The other options, such as electromagnetic (B), alternating (C), and inductive (D), do not accurately describe the type of charge stored in a capacitor's dielectric material.

Question 6

Polarized capacitors can be used in AC circuits only.

Accepted Answer

Polarized capacitors can be used in both AC and DC circuits. However, they are designed to work with a specific polarity and can only be connected in one direction. Non-polarized capacitors, on the other hand, can be used in both directions and are suitable for AC circuits as well.

Question 7

Capacitors are devices that support a change of voltage.

Accepted Answer

Capacitors resist changes in voltage by storing and releasing electrical energy in the form of an electric field.

Question 8

Polarized capacitors are generally referred to as ____ capacitors.&#10;A) AC&#10;B) solid-state&#10;C) electrolytic&#10;D) low-capacitance

Accepted Answer

Polarized capacitors are also referred to as electrolytic capacitors, which use an electrolyte solution to achieve their capacitance. Option A (AC) is not necessarily incorrect, as some capacitors are specifically designed for use with alternating current, but it is not the best choice here. Option B (solid-state) refers to a type of electronic device that does not use vacuum tubes or mechanical moving parts, such as transistors or integrated circuits, which is not relevant to the question. Option D (low-capacitance) does not accurately describe polarized capacitors, which are known for their relatively high capacitance values.

Question 9

Capacitors charge and discharge at a(n) ____ rate.&#10;A) linear&#10;B) unpredictable&#10;C) exponential&#10;D) quadratic

Accepted Answer

Capacitors charge and discharge exponentially over time, meaning the rate of change decreases as the capacitor approaches its maximum charge or discharge level.

Question 10

The stretching of the atoms of the dielectric is called dielectric ____.&#10;A) charging&#10;B) plating&#10;C) elasticity&#10;D) stress

Accepted Answer

When an external electric field is applied to a dielectric material, the atoms of the material are stretched and pulled in opposite directions, causing a stress on them. This stress is called dielectric stress.

Question 11

A dielectric test set is often referred to as a ____.&#10;A) HIPOT&#10;B) LOPOT&#10;C) HICAP&#10;D) LOCAP

Accepted Answer

The answer of A dielectric test set is often referred...

Question 12

The ____ is sometimes referred to as a micro-microfarad.&#10;A) millifarad&#10;B) picofarad&#10;C) femtofarad&#10;D) nanofarad

Accepted Answer

The answer of The ____ is sometimes referred to as...

Question 13

A 35-$\mu$F capacitor is connected to a 120-V, 60-Hz line. How much current will flow in this circuit?&#10;A) 1.47 A&#10;B) 1.58 A&#10;C) 1.69 A&#10;D) 1.80 A

Accepted Answer

The answer of A 35-$\mu$F capacitor is connected to a...

Question 14

Variable capacitors are generally rated in ____.&#10;A) picofarads&#10;B) microfarads&#10;C) millifarads&#10;D) farads

Accepted Answer

The answer of Variable capacitors are generally rated in ____.&#10;A)...

Question 15

What is the formula for capacitive reactance?&#10;A)  &#10;B)  &#10;C)  &#10;D)

Accepted Answer

The answer of What is the formula for capacitive reactance?&#10;A)...

Question 16

Capacitors contain insulating materials known as ____.&#10;A) inductors&#10;B) VARs&#10;C) dielectrics&#10;D) plates

Accepted Answer

The answer of Capacitors contain insulating materials known as ____.&#10;A)...

Question 17

____ capacitors are often referred to as AC capacitors because they are not sensitive to polarity connection.&#10;A) Polarized&#10;B) Nonpolarized&#10;C) Wet&#10;D) Dry

Accepted Answer

The answer of ____ capacitors are often referred to as...

Question 18

What is the disadvantage of the dry-type electrolytic capacitor?&#10;A) It will reform if the polarity is reversed.&#10;B) It will not reform if the polarity is reversed.&#10;C) It is not very leak-proof.&#10;D) It does not have gauze to hold the borax solution.

Accepted Answer

The answer of What is the disadvantage of the dry-type...

Question 19

Inductive VARs and capacitive VARs are ____ degrees out of phase with each other.&#10;A) 45&#10;B) 90&#10;C) 120&#10;D) 180

Accepted Answer

The answer of Inductive VARs and capacitive VARs are ____...

Question 20

Air is assigned the dielectric constant ____ and is used as a reference for comparison.&#10;A) 0&#10;B) 1&#10;C) 10&#10;D) 100

Accepted Answer

The answer of Air is assigned the dielectric constant ____...

Deck 11: Capacitive Loads