Deck 33: Consequent Pole Motors

Question 1

Why are eleven pin control relays used to provide interlock protection?

Answer 1

Eleven pin control relays are used to provide interlock protection because they each contain three sets of contacts.

Question 2

The number of stator poles is changed by redirecting the ____________________ through pairs of poles.

Answer 2

current

Question 3

Figure 33-7


The circuit shown in the accompanying figure forces the motor to start in high speed.

Answer 3

False

Question 4

A three phase, two-pole motor contains eight actual poles.

Question 5

Consequent pole motors intended to operate with four speeds use ____________________ reconnectable windings.

Question 6

Consequent pole motors have the ability to change speed by changing the number of ____________________.

Question 7

Three-speed consequent pole motors can be wound to produce constant horsepower, constant torque, or variable torque.

Question 8

The magnetic field makes one ____________________ of a two-pole motor each complete cycle.

Question 9

The magnetic field travels through the same number of poles during each complete cycle.

Question 10

If the winding is such that the series delta gives the low speed and the parallel wye gives the high speed, the torque will be the same for both speeds.

Question 11

Figure 33-10A
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The above figure shows a four-speed, two-winding three phase consequent pole motor with constant ____________________.

Question 12

What are the two factors that determine the synchronous speed of an AC motor?

Question 13

In a circuit for controlling a four-speed, three phase consequent pole motor, how is any speed selected?

Question 14

How many windings do consequent pole motors that are intended to operate with three speeds have?

Question 15

Explain how the direction of current flow determines the number of poles.