IDA-201 Midterm Exam Prep pt.3

A motor that has a service factor of 1.10 means that it can operate _____% of its rated horsepower for a limited period of time.

• 10

• 110

• 1.0

• 0.10

The two basic types of converters are the phase-controlled rectifier and the diode bridge rectifier.

• True

• False

Motors have two different current ratings, the full-load or rated amps (FLA or RLA) and the ____________.

• running-load amps

• locked-rotor amps

• cycles per second

• induction current

When enough back EMF has built up, called _______ voltage, the contacts between terminals 1 and 2 of a potential relay will open.

• pick up

• potential

• coil

• rated

Two types of motor drives are _________ drives.

• rigid and resilient

• sleeve and ball

• oil port and permanently lubricated

• belt and direct

In the United States, the frequency in cycles per second (cps) at which an AC electric motor operates under normal conditions is

• 50

• 60

• 208

• 120

The current that a motor is drawing at its service factor loading is referred to as 

• full-load amperage (FLA).

• locked-rotor amperage (LRA).

• rated-load amperage (RLA).

• service factor amperage (SFA).

The resistance between the terminals of a three-phase compressor motor __________.

• is the same

• will vary from one terminal to the next

• should add up to the locked-rotor amperage

• should be within 20% of each other

Two primary electric-motor mount characteristics are ___________ mounts.

• rigid and resilient

• sleeve and ball

• oil port and permanently lubricated

• belt and direct drive

The motor parameter that is used to determine how hot the motor can be safely operated is

• service factor (SF).

• revolutions per minute (rpm).

• service factor amperage (SFA).

• insulation class or type.