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Exam 8: Basic Electric Motors

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Question 1

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

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Question 2

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The electromagnet is a magnet produced through ____________________.

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

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

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

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

The most commonly used rotor today is the ____________________ rotor.

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

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

What is magnetism?

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.

All magnets have three poles.

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

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

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

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

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

How do electric motors work?

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

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