Review Electrical Controls

This page lets you test your knowledge of the material in the Electrical Controls section. Your percentage of correct answers will be presented when you click on the Submit button.

1.	Which statement is true?

	Fuses and circuit breakers protect motors.
	Fuses and circuit breakers protect compressors.
	Fuses and circuit breakers protect wiring systems.
	all of the above

2.	Which statement is true?

	Quick blow fuses should be used in all motor circuits.
	Quick blow fuses protect motors from Back EMF.
	Quick blow fuses protect motors from FLA.
	none of the above

3.	Which is true?

	Contactors have overloads, starters do not.
	A relay has a more powerful closing force than a contactor.
	The most common type of contactor failure is an open coil.
	none of the above

4.	Which statement is false?

	Overloads are selected or set to just over the full load amp rating of the motor.
	Contactors can fail mechanically as well as electrically.
	A contactor is composed of switches and a coil so volts, ohms and amps can be used to diagnose them.
	none of the above

5.	Which is not an electrical load?

	coils
	windings
	heaters
	none of the above

6.	Identify this switch.

	high pressure switch
	freeze protection T-Stat
	fan cycling switch
	limit switch - manual reset

7.	The board in this image is a:

	amperage sensor
	defrost board
	2 speed motor controller
	none of the above

8.	Identify this component.

	start relay
	utility relay
	OFM Relay
	compressor contactor

9.	Identify this component.

	2P relay
	4P contactor
	2P contactor
	4P relay

10.	Which statement is false?

	A NTC thermister's resistance is proportional to changes in temperature.
	A PTC thermister's resistance is inversely proportional to changes in temperature.
	The word thermister is a combination of "Thermal" and "Temperature".
	all of the above

11.	Which statement is true?

	A MOV is a type of switch.
	A sequencer is only used for delaying heater elements.
	A sequencer can be diagnosed with just an ohm meter.
	none of the above

12.	A demand defrost has a:

	time initiation and a temperature termination
	time/temperature initiation and a time/temperature termination
	time initiation and a time/temperature termination
	None of the above statements are true.

13.	What can cause a motor to make a 60 cycle humming noise and draw locked rotor amperage?

	worn bearings
	seized bearings
	open windings
	All of the above are correct except C.

14.	Which statement is true?

	Transformers sometimes come equipped with an auxilliary switch.
	Transformers sometimes come equipped with a circuit breaker.
	Coils encased in Bakelite cannot fail.
	all of the above

15.	Which statement is true?

	Electrical schematics show the logic behind an electrical circuit.
	Wiring diagrams show the logic behind an electrical circuit.
	Electrical schematics show the physical wiring layout.
	All of the above are true.

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