Exam 19: Ac Motors

A(n) ____ motor is an AC motor in which the rotor revolves at the same speed as the rotating magnetic field.

A capacitor-start, induction-run motor called a(n) ____ motor is frequently used for installations requiring higher starting torque than is available from the resistance split-phase motor.

What purpose does brush-shifting accomplish in a motor?

To reverse the direction of rotation of the rotor, you would ____.

To determine the synchronous speed of a motor, multiple 120 by the frequency of the supply current in hertz and divide their product by the ____.

One advantage of the wound-rotor induction motor compared to the squirrel-cage motor is that it has lower initial cost and maintenance costs.

The induction motor is the most common type of AC motor.

The ____ motor is a single-phase motor that starts based on the principle that like poles repel.

One method of making a single-phase motor self-starting is to apply the ____ principle.

The speed of the rotor of an induction motor depends upon the synchronous speed and the load it must drive.

The two main components of an induction motor are the stator and the conductor.

The difference between the synchronous speed and the rotor speed is called the ____ of the rotor.

On the three-phase motor, the windings are arranged to produce a rotating magnetic field when connected to a three-phase source.

Single-phase, ____ motors are started by means of a low-resistance short-circuited coil placed around one tip of each pole.

The magnetic field of a two-pole induction motor completes ____ revolutions per minute when supplied with 60 Hz.