ESCO AC Test Prep Questions and Correct Answers

ESCO AC Test Prep Questions and Correct
Answers
Question 1
Mechanical shaft seal is necessary on a
Correct Answer
Open drive compressor



Question 2
While troubleshooting a residential split system the service technician finds low
operating pressures in low system amperage draw. This could be an indication of
Correct Answer
Low airflow across the evaporator



Question 3
_________ can be use for a leak detection with all high-pressure refrigerant
Correct Answer
Soap bubbles



Question 4
A low refrigerant charge in an air conditioning system will cause the symptoms
Correct Answer
Low suction pressure and low discharge pressure



Question 5
0 pounds per square inch gauge is
Correct Answer
The same as atmospheric pressure




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,Question 6
The sequential order of steps in the vapor compressions process are
Correct Answer
Compression, Condensation, Expansion, Vaporization



Question 7
The automatic expansion valve is designed to maintain
Correct Answer
Constant evaporator pressure



Question 8
Frost on the suction line indicates
Correct Answer
That its temperature is below the dew point and its below 32 degrees



Question 9
A faulty condenser fan motor on an air conditioning system will cause the symptoms
Correct Answer
High suction pressure and high discharge pressure



Question 10
When testing the efficiency of an air-cooled condenser, the refrigerant condensing
temperature should be approximately ________ higher than the entering air
temperature
Correct Answer
30°F




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, Question 11
The oil pressure safety switch is operated by _________.
Correct Answer
the difference between crankcase pressure and oil pump pressure



Question 12
what type of gauge is used to measure microns
Correct Answer
an electronic vacuum gauge



Question 13
Scroll compressor move refrigerant by
Correct Answer
Involute Spirals



Question 14
Which of the following is true of a solenoid valve in a pump down system
Correct Answer
Its located before the metering device



Question 15
The only way to minimize flash gas is by
Correct Answer
Sub-cooling the liquid refrigerant entering the metering device closer to the
evaporator temperature



Question 16
The evaporator
Correct Answer
Transfers heat from the refrigerated space to the refrigerant




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