Deck 16: Solid-State Starters and Controls

Question 1

The highest ___________________ results when the speed controller is in the fast position and no resistance is inserted in the rotor circuit.

Answer 1

operating efficiency

Question 2

If the full resistance of the speed controller is inserted into the rotor circuit when the motor is running, the rotor current decreases and the motor slows down.

Answer 2

True

Question 3

If all resistance is removed from the rotor circuit of a wound-rotor induction motor, the current and motor speed ___________________.

Answer 3

increase

Question 4

The speed controller used with a wound-rotor induction motor is sometimes called the ___________________ control.

Question 5

How is the direction of rotation of a wound-rotor induction motor reversed?

Question 6

The stator of a wound-rotor motor is the same construction as the ___________________ motor stator.

Question 7

List two advantages offered by wound-rotor motors.

Question 8

The starting torque output of a wound-rotor induction motor is poor when all resistance is removed from the rotor circuit.

Question 9

To minimize the starting surge of current to a wound-rotor induction motor, insert the full resistance of the speed controller in the rotor circuit.

Question 10

What are the main components of a wound-rotor induction motor?

Question 11

The wound-rotor induction motor and the squirrel-cage induction motor both were developed for variable speed applications.

Question 12

In general terms, briefly compare the power factor of a wound-rotor induction motor at no load and at rated load.

Question 13

What is the formula for calculating synchronous speed in RPM?

Question 14

The ___________________ consists of a cylindrical core composed of steel laminations.

Question 15

As resistance is removed from the rotor circuit, the rotor speed will continue to increase until its speed matches the synchronous speed of the field developed by the stator windings.