Deck 28: Dc Motors

Question 1

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

Answer 1

speed regulation

Question 2

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

Answer 2

base,normal

Question 3

What are the three basic types of armature windings?

Answer 3

The three basic types are lap, wave, and frogleg.

Question 4

What are the three basic types of direct current motors?

Question 5

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

Question 6

Shunt motors are often called ____________________ motors.

Question 7

On what principal do series motors operate?

Question 8

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

Question 9

Frogleg wound armatures are most often used in small machines.

Question 10

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

Question 11

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 12

Compound motors contain both a series and shunt field.

Question 13

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

Question 14

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

Question 15

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.