Question 1

What are the disadvantages of using direct current to supply consumers with their electrical needs?

Accepted Answer

Transmission for a long distance is impossible without using generators to boost the power. The inability to raise and lower DC voltages and the need to use large transmission equipment are other problems.

Question 2

What are the main components of an alternator?

Accepted Answer

The alternator is made up of a winding, or set of windings, called the stator and a rotating magnet called the rotor.

Question 3

Alternating current is produced by a(n) ____________________.

Accepted Answer

alternator

Question 4

The frequency of alternating current is the number of complete cycles that occur in a minute.

Accepted Answer

The frequency of alternating current is the number of complete cycles that occur in a second, not a minute, and is measured in hertz (Hz).

Question 5

What is the power factor and how is it usually expressed mathematically?

Accepted Answer

The answer of What is the power factor and how...

Question 6

Alternating current reaches a peak at ____________________ electrical degrees, also known as the peak voltage.

Accepted Answer

The answer of Alternating current reaches a peak at ____________________...

Question 7

The frequency is known as ohms but many times, it is referred to as cycles.

Accepted Answer

Frequency is measured in Hertz (Hz), not ohms. Ohms measure electrical resistance, while frequency refers to the number of cycles per second of a wave.

Question 8

The ____________________ of an AC circuit is the number of currents alternating at different time intervals in the circuit.

Accepted Answer

The answer of The ____________________ of an AC circuit is...

Question 9

In the United States, the common frequency is 50 Hz.

Accepted Answer

In the United States, the common frequency for electrical systems is 60 Hz, not 50 Hz.

Question 10

There are two types of electric current: direct current and ____________________ current.

Accepted Answer

The answer of There are two types of electric current:...

Question 11

What is reactance?

Accepted Answer

The answer of What is reactance?...

Question 12

The 240-Volt-Three-Phase-60-Hertz or ____________________ system is used in structures that require a large supply to motors and other three-phase equipment.

Accepted Answer

The answer of The 240-Volt-Three-Phase-60-Hertz or ____________________ system is used...

Question 13

What is the difference between single-phase and three-phase current?

Accepted Answer

The answer of What is the difference between single-phase and...

Question 14

What is inductance?

Accepted Answer

The answer of What is inductance?...

Question 15

Direct current is an electron flow in only one direction.

Accepted Answer

Direct current (DC) is characterized by the unidirectional flow of electric charge, typically electrons, from the negative to the positive terminal.

Question 16

One cycle occurs when the rotor, or conductor, cuts the magnetic field of a north pole and south pole.

Accepted Answer

In a basic electromagnetic generator or motor, one cycle is completed when the rotor (or conductor) moves in such a way that it cuts through the magnetic fields of both a north pole and a south pole. This action induces an electromotive force (EMF) due to electromagnetic induction.

Question 17

The effective voltage of an alternating current circuit is ____________________ times its peak voltage.

Accepted Answer

The answer of The effective voltage of an alternating current...

Question 18

What is capacitive reactance?

Accepted Answer

The answer of What is capacitive reactance?...

Question 19

Because alternating current starts at zero, reaches a peak, and then returns to zero, there is always a variation in voltage and an effective value has to be determined.

Accepted Answer

Alternating current (AC) indeed starts at zero, reaches a peak, and then returns to zero, completing a cycle. This results in a variation in voltage over time. The effective value, often referred to as the root mean square (RMS) value, is calculated to represent the equivalent direct current (DC) value that would deliver the same power to a load.

Question 20

What is inductive reactance?

Accepted Answer

The answer of What is inductive reactance?...

Quiz 7: Alternating Current, Power Distribution, and Voltage Systems