Deck 29: Single-Phase Motors

Question 1

What does it mean if a thermistor has a positive coefficient of resistance?

Answer 1

When a thermistor has a positive coefficient of resistance, it means that it increases its resistance with an increase of temperature.

Question 2

What are the three types of split phase motors?

Answer 2

The three types of split phase motors are resistance start induction run, capacitor start induction run, and capacitor start capacitor run.

Question 3

In order to split one phase into two, split phase motors contain two separate windings. What are they and how are they connected to each other?

Answer 3

In order to split one phase into two, split phase motors contain two separate windings: the run winding and the start winding. The run and start windings are connected in parallel with each other.

Question 4

How can the direction of rotation of a split phase motor be reversed?

Question 5

The potential starting relay is used with the capacitor-start capacitor-run or ____________________ capacitor motor.

Question 6

The solid-state relay uses a solid-state component called a(n) ____________________.

Question 7

In split phase motors, the centrifugal switch is operated by springloaded ____________________.

Question 8

Shaded pole motors are used in applications where it is necessary to reverse the direction of rotation of the motor.

Question 9

The hot-wire relay functions as both a starting relay and an overload relay.

Question 10

What are the two factors which determine the speed of a rotating magnetic field?

Question 11

In order to produce a rotating magnetic field, there must be more than one phase.

Question 12

Motors that change speed by changing the number of stator poles are called ____________________ motors.

Question 13

Centrifugal switches can be used on all types of split phase motors.

Question 14

Multiple speeds are obtained by connecting inductance in parallel with the main run winding.

Question 15

Split phase motors operate on the principle of a rotating ____________________.