This quiz covers key concepts of motor control systems, focusing on split-phase and capacitor motors, their components, and operational characteristics.
Potential relay
Current relay
Centrifugal switch
All of the above
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Current in the start winding
Voltage across the start winding
Voltage across the run winding
Current in the run winding
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Energized
De-energized
In series with the run winding
Removed from the circuit
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Capacitor Start, Capacitor Run (CSCR)
Capacitor Start, Induction Run (CSIR)
Induction Start, Induction Run (ISIR)
Permanent Split Capacitor (PSC)
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5 microfarads
4 microfarads
20 microfarads
25 microfarads
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4 microfarads
5 microfarads
20 microfarads
25 microfarads
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Potential relay
Current relay
Centrifugal switch
None of the above
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Size
Voltage
Amperage
Number of motor poles
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Outside
Inside
Between
In series with
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Fewer turns than the run windings
More turns than the run windings
The same number of turns as the run windings
Larger diameter wire than the run windings
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Circuit board
Capacitor
Centrifugal switch
Dual voltage switch
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Longer starting time
Greater starting torque
An aid in starting three phase motors
More efficient operation at full load speed
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Has little starting torque
Has excessive starting torque
Has greater efficiency than most split-phase motors
Will start against a heavy starting load
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Three start and three run windings for each phase
One start and one run winding for each phase
Run windings only
A start switch in each phase circuit
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Capacitor
Thermistor
Switching device
Diode
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Start and run capacitor
Start capacitor only
Run capacitor only
Split phase capacitor
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The noise level of the motor
The type of base on which the motor is mounted
The normal operating temperature of the motor
Both a and b
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They are too large.
They are too noisy.
They are too expensive.
They cannot be replaced.
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Enclosed
Drip proof
Explosion proof
Open
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170 volts
220 volts
238 volts
Both a and c
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Light load and where noise is a factor
Heavy load and where noise is a factor
Heavy load in a dirty atmosphere
Heavy load in a moist atmosphere
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Lower than
The same as
Higher than
In reverse polarity than
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+10% -5%
+5% -10%
+10% -10%
+15% -15%
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Two
Three
Five
Ten
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Cradle mount
Rigid base mount
Pulley
Coupling
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Large or small
Narrow or wide
A or B
1 or 2
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Micronometer
Dial indicator
Monometer
Sling psychrometer
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Drain plug
Purge screw
Relief plug
Retaining screw
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Prevent rotation of the motor in the mount
Help reduce motor vibration transfer to the object on which the motor is mounted
Ground the motor in case of winding failure
Act as the position for locating the motor leads
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Zero ohms
50-3000 ohms
5000-6000 ohms
Infinite
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Technician "A" is correct. Technician "B" is correct.
Technician "A" is correct. Technician "B" is incorrect.
Technician "A" is incorrect. Technician "B" is correct.
Technician "A" is incorrect. Technician "B" is incorrect.
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Circuit breaker
Motor starter overload
Thermally activated device in the motor winding
Line fuse
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National Electrical Code
National Electrical Manufacturers Association code
Motor's reserve capacity
The required wire size supplying power to the motor
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Solder pot
Magnetic
Bimetal
Time-delay fuse
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United States Department of Transportation
National Electrical Code
Environmental Protection Agency
American National Standards Institute
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Reduce the cost of the contactor
Make it easier to wire the unit
Teach the service technician not to put hands in the unit with the power on
Provide off-cycle heat to the compressor
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Keep the contacts in line
Help obtain equal contacts against the stationary contacts
Slow down the pull of the armature into place to reduce the noise
Increase the power required to close the contacts
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Replace the bearings.
Replace the bearings and shaft.
Add a capacitor to the circuit for added torque.
Replace the entire motor.
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A: common B: start C: run
Cannot identify terminals: winding grounded
A: start B: run C: common
Cannot identify terminals: open winding
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Technician "A" is correct. Technician "B" is correct.
Technician "A" is correct. Technician "B" is incorrect.
Technician "A" is incorrect. Technician "B" is correct.
Technician "A" is incorrect. Technician "B" is incorrect.
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Technician "A" is correct. Technician "B" is correct.
Technician "A" is correct. Technician "B" is incorrect.
Technician "A" is incorrect. Technician "B" is correct.
Technician "A" is incorrect. Technician "B" is incorrect.
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With the starting components
With an open winding
With insufficient supply voltage
All of the above
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The winding is making contact with the motor failure
One winding is making contact with another winding
A wire in a winding is broken
The centrifugal switch to the start winding is open
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Motor probably will not start
Motor will draw too much current while it is running
Centrifugal starting switch will not start the motor
Load on the motor is probably too great
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Has no effect on the electrical connection
Acts as an electrical resistance and causes the connection to heat more
Decrease the resistance
None of the above
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Is a ammeter that can measure small amounts of current
Is digital voltmeter that measures very high resistances
Measures high voltage direct current
Measures very high resistances
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Place a screwdriver across the terminals
Assume it will discharge itself over a period of time
Use 20,000 ohm 5 watt resistor that has had insulated leads soldered to it
Use an ohmmeter
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Trip a circuit breaker to shut off the unit
Keep running as the current is only going to ground
Run a little faster because the amperage draw will increase
Cause the evaporator to ice up
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Quiz Review Timeline (Updated): Mar 21, 2023 +
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