Exam 18: Application of Motors

Regardless of the type of motor or application, the motor bearings require yearly lubrication.

Explain the locked-rotor amperage (LRA).

When oiling a permanently lubricated motor, a 20-weight, non-detergent motor oil should be used.

One method a technician can employ to check a motor is to take amperage readings of a motor (both on start-up and after start-up) and compare them to the motor's nameplate.

In order to be electrically safe, a motor that is set in a "resilient" mount, must have a(n) ____________________.

The delta transformer has been popular in some locations in the past.

A motor can burn out if the supply voltage is either too high or too low.

When referring to motors, to what does the "insulation class" relate?

The locked-rotor amperage is normally ____ times as great as the run-load amperage.

Grounding straps are required on resilient mounted motors to ____.

A slotted screw at the bottom of the bearing housing is called a ____.

There is a definite relationship between the speed of the motor and the speed of the blower.

Which of the following voltages are not safe for a 208-V motor to operate?