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

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

Accepted Answer

delta

Question 4

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 5

What is reactance?

Accepted Answer

The answer of What is reactance?...

Question 6

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

Accepted Answer

The common frequency in the United States is 60 Hz.

Question 7

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 8

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

Accepted Answer

This is the definition of one cycle of rotation in an electric motor or generator.

Question 9

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 10

Direct current is an electron flow in only one direction.

Accepted Answer

Direct current (DC) flows in only one direction, whereas alternating current (AC) changes direction periodically.

Question 11

What is capacitive reactance?

Accepted Answer

The answer of What is capacitive reactance?...

Question 12

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

This statement is true. The effective value (also known as the root mean square or RMS value) of an AC voltage is determined by taking into account its continuous variation from zero to peak and back to zero.

Question 13

What is inductance?

Accepted Answer

The answer of What is inductance?...

Question 14

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

Accepted Answer

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

Question 15

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 16

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 17

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

Accepted Answer

The frequency is measured in Hertz (Hz), not ohms or cycles. Ohms is the unit of electrical resistance.

Question 18

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 19

What is inductive reactance?

Accepted Answer

The answer of What is inductive reactance?...

Question 20

Alternating current is produced by a(n) ____________________.

Accepted Answer

The answer of Alternating current is produced by a(n) ____________________....

Quiz 7: Alternating Current Power Distribution and Voltage Systems