FREE AND STUDY GAMES ABOUT AC EXAM QUESTIONS

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FREE AND STUDY GAMES ABOUT AC EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -45 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: the standard unit for measuring the quantity of heat in a substance is

Answer:

the British thermal unit BTU Question 2: when a TEV or a capillary tube is used as a metering device a low refrigerant charge will cause

Answer:

low head pressure Question 3: an inefficient compressor is usually indicated by BLANK head pressure and Blank suction pressure

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lower the than normal/ higher than normal

Question 4: A liquid to suction heat exchanger is often used to

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increase liquid sub cooling

Question 5: a compressor that has a broken valve will cause these symptoms

Answer:

high suction pressure and low discharge pressure

Question 6: frost on the suction line indicates

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that its temperature is below the dew point and below 32 degrees F Question 7: low operating pressures and low system amp draw this could be an indication of

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A low airflow across the evaporator

Question 8: the movement of heat by direct contact is called

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conduction

Question 9: can be used for leak detection with all high pressure refrigerants

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soap bubble solution

Question 10: moisture in a refrigeration system can cause

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compressor failure

Question 11: heat which causes a change in temperature of a substance is called

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sensible heat

Question 12: zero psia is

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a pressure which cannot be further reduced

Question 13: in order to remove as much moisture as possible from a system

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triple evacuate the system to 500 microns with a deep vacuum pump Question 14: air or other non condensable gasses in a capillary tube air conditioning system will cause these sysmptoms

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low suction pressure and high discharge pressure Question 15: which of the following symptoms would be indicative of an oil logged condenser

Answer:

high discharge line pressure and low liquid line pressure

Question 16: bubbles in a sight glass could be an indication of

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refrigerant blend with a high temperature glide Question 17: A customer complains that their air conditioning system is running constantly, but not cooling enough. the suction line is very cold and the compressor is sweating the most likely cause is

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a restriction of the return air or a dirty evaporator Question 18: heat added to the refrigerant in a vapor state after the evaporation process is called

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superheat Question 19: no cooling complaint unit to be completely out of refrigerant technician decides to use a trace amout of refrigerant and BLANK in order to pressurize the system

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an inert gas

Question 20: an overcharge of refrigerant will cause

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increased head pressure

Question 21: heat added to a substance without a rise in temperature

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latent heat of vaporization

Question 22: A temperature differential across a filter drier indicates

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restricted filter drier Question 23: the temperature at which moisture will start to condense from the air is called

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dew point temperature Question 24: system is started the compressor is noisy and running hot the most probable cause of the noise is

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low oil in the system Question 25: which of the following is true of a solenoid valve in a pump down system

Answer:

it is located before the metering device

Question 26: a sight glass would normally be located

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in the liquid line before the metering device

Question 27: water will vaporize at what temperature in a 28 in hg vacuum

Answer:

100 degrees F