Deck 8: Basic Electric Motors

Question 1

An alternating current motor's speed is determined by the frequency of the power supply only.

Answer 1

False

Question 2

The electromagnet is a magnet produced through ____________________.

Answer 2

electricity

Question 3

If the north pole of a bar magnet is brought close to the north pole of another bar magnet, they will ____________________ each other.

Answer 3

repel

Question 4

The magnetic lines of force of a magnet that flow between the north and south poles are called ____________________.

Question 5

A permanent magnet is a piece of magnetic material that has been magnetized and can hold its magnetic strength for a reasonable length of time.

Question 6

What is induced magnetism? When is the magnetic field stronger?

Question 7

Two types magnets are in use today: the electromagnet and the ____________________ magnet.

Question 8

If the south pole of a bar magnet is brought close to the north pole of another bar magnet, they will ____________________ each other.

Question 9

The ____________________ is a brushless DC, three-phase motor with a permanent magnet rotor.

Question 10

Magnetism can only be produced by the earth's core.

Question 11

To make an electric motor move continuously, the magnetic field must rotate.

Question 12

The most commonly used rotor today is the ____________________ rotor.

Question 13

What is magnetism?

Question 14

Motors are selected mainly because of the starting torque required for the motor to perform its function.

Question 15

The resistance-start-induction-run motor has only a starting winding.

Question 16

An alternating current of 60 hertz changes direction 100 times per second.

Question 17

All magnets have three poles.

Question 18

How do electric motors work?

Question 19

The capacitor consists of two aluminum plates with an insulator between them.

Question 20

Motor speed is generally used to classify motors into different types.