Refrigeration is used in different appliances around us, most commonly in refrigerators in our houses and places of work. How conversant are you with the refrigeration system, functionality and how to repair broken parts? Give this test on the system a try and polish up what you have forgotten before the finals.
Be defrosted by off-cycle defrost
Not need to be defrosted
Need electric defrost
Need a hot gas defrost
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Have its fins very close together
Not need to be defrosted
Need a hot gas defrost
Both a and b
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Remain on to speed up the defrost
Turn off
Cycle with the condenser
Cycle with the compressor
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10 psig
25 psig
15 psig
5 psig
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Is desired to prevent liquid from entering the compressor
Will reduce the cooling capacity of the system
Can be removed by removing refrigerant from the system
Will cause the system to go into defrost
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The evaporator fan motor is defective.
The unit is not staying in defrost long enough.
The defrost heater is defective.
All of the above are correct.
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Evaporator fan not running
Compressor not running
Condenser fan not running
No problem, ice formation normal
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Evaporator fan not running
Compressor not running
Condenser fan not running
No problem, ice formation normal
9°F
59°F
34°F
25°F
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40°F
55°F
75°F
200°F
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Stainless steel tubing
An excess of liquid refrigerant
An excess of vapor refrigerant
Multiple refrigerant circuits
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Flooding the evaporator
Adding the evaporator
Defrost
Suction pressure control
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Supplemental electric heat when the system is shut down
Hot gas when the system is operating
The space temperature when the compressor is off
The space temperature when the compressor is off
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Flooded evaporator
Dry-type evaporator
Multi-circuit evaporator
Stamped evaporator
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High temperature
Medium temperature
Low temperature
Sharp freezing
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14 to 16°F
4 to 6°F
8 to 12°F
6 to 8°F
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Remain open during the off cycle
Close, since the head pressure is lower
Open all the way to remove any residual heat
Re-calibrate itself to maintain the new lower head pressure
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75°F
0°F
95°F
105°F
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The outlet water will be 88°F.
The system head pressure will rise
The water regulating valve will close.
Both a and b are correct.
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Condenser that had refrigerant leaving with 10°F of superheat
Condenser that had refrigerant leaving with 15° of subcooling
Condenser that had refrigerant leaving as 100% vapor
Condenser that had refrigerant leaving with 10° of subcooling
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30°F
15°F
100°F
130°F
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Forced draft air-cooled
Induced draft air-cooled
Water-cooled parallel flow
Water-cooled counter flow
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Have some type of head pressure control
Use a water regulating valve
Have a multi-circuit evaporator
Operate with zero degrees of subcooling
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Fan cycling
Dampers or louvers
Water regulating valve
All of the above
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Fan cycling
Condenser flooding valve
Dampers or louvers
All of the above
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Absorbs heat
Gives up heat
Changes to a vapor
Is under lower pressure than the evaporator
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Desuperheats the vapor from the compressor
Condenses the vapor from the compressor
Subcools the liquid refrigerant before it leaves the condenser
All of the above
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A conductor of heat
An insulator
A cleaning solution
They have no effect on the operation of the condenser.
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By removing the end caps
With a brush
Chemically
By air pressure
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With a brush after removing the end caps
Only with chemicals
With compressed air
With a vacuum cleaner
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Increase
Decrease
Remain the same
Correspond to the evaporator saturation temperature
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Refrigerant flow through the pressure reducing device
Refrigerant condensing temperature
Suction pressure
Water temperature
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Cycling the condenser fan
Controlling dampers in the airstream through the condenser
Flooding the condenser with refrigerant
All of the above
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Less than
Greater than
The same as
Slightly lower than
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Increasing the condensing surface area
Increasing the cfm through the condenser
Decreasing the temperature of the air entering the condenser
All of the above
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True
False
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False
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False
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False
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False
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False
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False
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False
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False
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False
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