Exam 19: Ac Motors

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

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

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

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.

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

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

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 ____.

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

What purpose does brush-shifting accomplish in a motor?

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

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

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

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

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

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