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WorksheetsIDA-201 Midterm Exam Prep pt.3
Total questions: 12
Worksheet time: 6mins
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.
If an electric motor is rated for 208 V, the maximum and minimum allowable voltages would be
187.2 and 228.8.
187.2 and 238.8.
208 and 240.
197.7 and 215.3.
The difference between the motor's calculated and actual speed is called _______.
motor differential
motor slip
running speed
synchronous speed
