Deck 28: Direct Current Motors

Question 1

On what principal do series motors operate?

Answer 1

Series motors operate on the principle of attraction and repulsion of magnetism.

Question 2

Compound motors contain both a series and shunt field.

Answer 2

True

Question 3

The differential in speed from no load to full load is referred to as ____________________.

Answer 3

speed regulation

Question 4

Shunt field windings exhibit a much higher resistance than the series field windings.

Question 5

What are the three basic types of direct current motors?

Question 6

Series field windings are marked F1 and F2 in the terminal connection box.

Question 7

When full line voltage is applied to both the armature and shunt field, the motor is said to operate at ____________________ speed.

Question 8

Compound motors generally employ a field loss relay (FLR) that is intended to disconnect the motor from the power line in the event that shunt field current should be interrupted or drop below an acceptable level.

Question 9

____________________ is the term used to indicate the relative strength of the series and shunt fields.

Question 10

What are the three basic types of armature windings?

Question 11

When compound motors are installed, what should they be tested for?

Question 12

Frogleg wound armatures are most often used in small machines.

Question 13

Shunt motors are often called ____________________ motors.

Question 14

The most common way of reversing the direction of rotation for a direct current motor is to reverse the direction of the current flow though the ____________________.

Question 15

Series type motors have one undesirable characteristic. What is it?