FREE AND STUDY GAMES ABOUT BASIC REFRIGERATION

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FREE AND STUDY GAMES ABOUT BASIC REFRIGERATION

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -72 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Why do we install sight glass in the liquid line?

Answer:

To see moisture, state of change.

Question 2: What do we do to prevent flashing in the liquid line?

Answer:

Sub cooling in condenser.Question 3: Describe the condition when liquid is forced back to the compressor.

Answer:

Flood back (liquid returning to the compressor)

Question 4: describe total heat.

Answer:

latent & sensible = total

Question 5: What will cause the release of refrigerant from the oil/refrigerant mixture?

Answer:

Sudden reduction of pressure at start up.Question 6: Describe the refrigerant when it leaves the metering device of the system.

Answer:

Reducing flash gas

Question 7: describe the heat compression.

Answer:

heat removed by condenser from refrigent Question 8: As 32°F liquid water is heated we witness:

Answer:

Sensible, Latent, Sensible Question 9: When a substance changes state from a liquid to a gas, the spacing of its

molecules:

Answer:

Increase greatly

Question 10: The ozone layer protects the earth from

Answer:

UV

Question 11: what is specific heat

Answer:

heat required per. unit mass to change one degree

Question 12: In the refrigeration cycle, where will we find superheated vapor?

Answer:

Inlet outlet of compressor

Question 13: What components separate the high side from the low side?

Answer:

Compressor, metering device Question 14: What chemical found in the upper stratosphere indicate that the ozone layer is being destroyed

Answer:

Chlorine Monoxide Question 15: What will result from the oxidation of the lube oil due to overheating?

Answer:

Sludge

Question 16: Describe where the latent heat of condensation is removed.

Answer:

Condenser.

Question 17: What will prevent the compressor from starting?

Answer:

low refrigerant level will not cause L/P switch to acturate

Question 18: What type of refrigerant is R-12

Answer:

CFC Question 19: List several good thermal insulator & therefore poor conductor?

Answer:

Polystyrene = poor conductor Copper, Aluminum = good thermal insulator Question 20: Your electric temp probe shows that the temp of the refrigerant in an evaporator is

40°F. It's condition is:

Answer:

Need the pressure to determine refrigerant condition

Question 21: Where does the refrigerant absorb the latent heat of vaporation?

Answer:

Evaporator.

Question 22: What causes crankcase oil to foam?

Answer:

Refrigerant boiling out of solution with the oil Question 23: discuss the procedure for a burn victim in the vicinity of energized electrical equipment

Answer:

secure power, check vitals, provide comfort

Question 24: Describe the shell on a chiller

Answer:

Casing that encloses the evaporator & condenser Question 25: List the four basic categories for the use of mechanical refrigeration

Answer:

Comfort, Refrigeration, Process, Cryogenics (low temp work) Question 26: Define the refrigeration system between the expansion value & the compressor.

Answer:

Low side

Question 27: What will cause the suction line temperature to increase?

Answer:

Heat load increase

Question 28: When does an automatic compressor restart?

Answer:

Suction pressure increases.