Question 1

The name ____________________ is given to the action whereby alternating current is forced toward the surface of a conductor.

Accepted Answer

skin effect

Question 2

Describe the effective resistance effect.

Accepted Answer

The effective resistance is the resistance that a circuit or component offers to alternating current. Also known as ac resistance, it may vary with the frequency, current, or voltage of the circuit. Effective resistance must not be confused with impedance. The quantity resulting from the combination of effective resistance and reactance is impedance.

Question 3

Describe dielectric losses.

Accepted Answer

As the impressed voltage rises to a maximum value twice in each cycle, a voltage stress is placed on the insulation of the conductor. Such a stress occurs first in one direction and then in the other. As a result, there is a small heat loss in the insulation. This loss is called the dielectric loss and is very small when compared to the other losses in the circuit due to the skin effect, eddy currents, and hysteresis. Usually the dielectric loss can be neglected.

Question 4

To obtain high values of inductance, ____________________ cores are usually required.

Accepted Answer

The answer of To obtain high values of inductance, ____________________...

Question 5

The base of an impedance triangle represents the ____________________.

Accepted Answer

The answer of The base of an impedance triangle represents...

Question 6

The power factor of the entire series circuit is the ____________________ of the total correct power in watts to the total apparent power in volt-amperes.

Accepted Answer

The answer of The power factor of the entire series...

Question 7

A low value of Q means that the resistance component is relatively low.

Accepted Answer

A low value of Q (Quality factor) in a resonant circuit indicates that the circuit has higher losses or higher resistance, not lower. Higher Q values indicate lower resistance and higher selectivity.

Question 8

Because of the skin effect, there is more useful copper conducting area with alternating current.

Accepted Answer

The skin effect causes the alternating current to concentrate near the surface of the conductor, effectively reducing the useful conducting area compared to direct current, where the entire cross-section of the conductor is utilized.

Question 9

A large Q is desirable because it means that the useful inductive reactance is high and the effective resistance is low.

Accepted Answer

A large Q (Quality Factor) in an inductor or resonant circuit indicates a higher ratio of inductive reactance to resistance, meaning the circuit is more efficient as it has higher selectivity or lower energy losses.

Question 10

What is the figure of merit?

Accepted Answer

The answer of What is the figure of merit?...

Question 11

Explain eddy current loss.

Accepted Answer

The answer of Explain eddy current loss....

Question 12

Reactors that have a high Q value are often treated as pure inductors, and the amount of wire resistance is ignored because it is such a small part of the total impedance of the coil.

Accepted Answer

Reactors with a high Q value have a high inductive reactance compared to resistance, making the resistance negligible in the total impedance calculation.

Question 13

The ____________________ of a coil is the result of the combination of the effective resistance and inductive reactance.

Accepted Answer

The answer of The ____________________ of a coil is the...

Question 14

The impedance section of each circuit considered consists of a reactor having a relatively large inductive reactance compared to the effective resistance.

Accepted Answer

In electrical engineering, a reactor refers to an inductor used in circuits, and it often has a relatively large inductive reactance compared to its effective resistance, especially in applications designed for power system protection, control, or filtering, where the primary purpose is to introduce inductance into the circuit.

Question 15

Explain hysteresis losses.

Accepted Answer

The answer of Explain hysteresis losses....

Quiz 4: Series Circuitsresistance and Impedance