Deck 1: Introduction to Alternating Current

Question 1

Most ac generators have ____________________ field windings.

Answer 1

rotating

Question 2

The commutators of dc generators are usually rated at less than ____________________ amperes (A).

Answer 2

8000

Question 3

If the generator has two pairs of poles, then a cycle is generated every half-revolution, or 2 hertz per second.

Answer 3

True

Question 4

A basic knowledge of trigonometry is essential to an understanding of alternating-current concepts.

Question 5

The use of ____________________'s generator rule shows that an alternating voltage is generated in the coil as it rotates.

Question 6

Identify and explain the formula used to express the frequency of an ac generator.

Question 7

What is the definition of alternating current?

Question 8

What is the advantage of using a higher-frequency?

Question 9

The amount of voltage induced in a conductor is proportional to what three factors?

Question 10

In electronics, the frequencies used cover a very narrow range.

Question 11

Alternating-voltage waveforms are all sine waves.

Question 12

Define alternating voltage.

Question 13

Direct current is used for various electrochemical processes, including electroplating, refining of copper and aluminum, electrotyping, production of industrial gases by electrolysis, and charging of storage batteries.

Question 14

One ____________________ represents an amount of magnetic flux equal to 100,000,000 lines.

Question 15

Traction motors require ____________________ current.