Refrigeration Basics Quiz - HVAC School

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Refrigeration Basics Quiz

December 29, 2016 Bryan Orr 8 Comments

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Test your skills to see if you are a refrigeration basics pro… or a parts changer

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Question 1 of 10

1. What does the ‘X’ terminal on a defrost timer do?

Common Terminal

Timer Power Feed

Defrost termination

Electric Heat

Question 1 of 10

Question 2 of 10

2. A cold control senses what to control a unit?

A disturbance in the force

Coil temperature

Supply Air temperature

Compressor Temperature

Question 2 of 10

Question 3 of 10

3. If a refrigeration system with a receiver has a clear sight glass, you know that it is properly charged.

TRUE: A clear sight glass and a cold suction line means the system is working properly

FALSE: A clear sight glass means the system is flat

FALSE: Beyond a clear glass, a specific amount must be added to allow for changing ambient conditions.

TRUE: However, you also need to check the Delta T and the wet bulb of the air

Question 3 of 10

Question 4 of 10

4. What does a pump down system prevent?

The system from pumping down when the TEV fails

Oil traps

Technician Fatigue from needing to use a refrigeration wrench on every off cycle

Flooded starts from liquid refrigerant migration during the off cycle

Question 4 of 10

Question 5 of 10

5. What does a CPR do in a system?

Maintains proper superheat

Keeps liquid out of the crankcase

Prevents overload of the compressor

Helps revive the system

Question 5 of 10

Question 6 of 10

6. What do low ambient control valves do?

Reduces the chance of compressor slugging

Maintain a minimum liquid pressure to the TEV.

Maintains suction pressure so the saturation does not fall below 32 degrees Fahrenheit

Prevents compressor underheating

Question 6 of 10

Question 7 of 10

7. An EPR valve sets a maximum pressure for the evaporator

True

False

Question 7 of 10

Question 8 of 10

8. What does the external equalizer on a TEV do? (versus internally equalized)

Compensates for pressure drop across evaporator coil

connects the valve to the coil

Equalizes pressure when the unit goes off

Allows for hot gas bypass

Question 8 of 10

Question 9 of 10

9. What is the purpose of a receiver?

To keep liquid refrigerant from entering the compressor

For extra efficiency in an air cooled compressor

To receive vapor and condense it to a liquid

To store refrigerant during changing system conditions

Question 9 of 10

Question 10 of 10

10. the purpose of the accumulator is ________

To improve the efficiency of the expansion valve by increasing the rate of flash gas velocity

To prevent liquid refrigerant from entering the compressor crankcase

To keep the compressor from accumulating too much oil

To store extra refrigerant for varying load conditions

Question 10 of 10

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Bryan Orr( Founder / Podcaster / Dad of 10 )

Bryan Orr is a lifelong learner, proud technician and advocate for the HVAC/R Trade

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8 comments

Joe Reinhard says:
December 30, 2016 at 5:53 pm
Great quiz! And I had just left in prior comment today a request for refrigeration type questions. Troubleshooting type questions would also be appreciated. Thanks for taking time to create these quizzes.
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1. Bryan Orr says:
  January 2, 2017 at 5:02 pm
  Noted and appreciated. Happy new year Joe.
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Terry Henry says:
January 2, 2017 at 10:30 am
There were multiple answers on the 3 I got wrong,haven’t done a whole lot of Refrigeration lately,but they were all right.You need to look at little deeper.Overall good quiz,Jeremy.
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Kamen Petrov says:
July 3, 2017 at 5:31 pm
great quiz,specially coz i work just amonia plant and english is no my main language its part from preparation for my F gas qualification thank you so much for help
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Marcos José Alves says:
July 18, 2017 at 6:00 pm
Muito bom o curso. mais muiatas palavras em ingles que não domino mais mesmo assim deu para o gasto, estão de parbéns
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Darwin says:
January 22, 2018 at 11:51 am
Thanks for the test. Controls are all that I need to get a hold of. Haha. Learning is my goal.
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rbgoetsch says:
March 28, 2019 at 5:46 pm
Typically, a cold control senses coil temperature in a reach-in to ensure off-cycle defrost. In a walk-in, a cold control normally senses box temperature.
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Kiwifridge says:
May 18, 2019 at 3:37 am
Interesting quiz, 10/10 had to guess the thermostat one tho, its not a thing here.
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