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ASE A7 Exam - Questions & Verified Answers (A+)
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ASE A7 Exam - Questions & Verified Answers (A+)An a/c compressor is noisy when the clutch is engaged but the noise goes away when the clutch is disengaged. Which of these is the MOST-likely cause?
a. faulty compressor clutch pulley bearing
b. low refrigerant charge
c. internal compressor damage
d. overtightened drive belt Correct Ans - c.
While conducting a pressure test on an a/c system, the ambient temperature is 80 degrees, the low side gauge reads low (8 psi), and the high side also reads low (85 psi). which of these could cause these readings?
a. low refrigerant level
b. normal operation
c. bad compressor
d. a high side restriction Correct Ans - a.
An a/c is being tested with pressure gauges. the high side pressure is low, and the low side pressure is high. which of these is the LEAST-likely cause of these pressures?
a. expansion valve stuck open
b. restriction in the high side of the system
c. the compressor's head gasket is leaking
d. the POA or STV is stuck closed Correct Ans - b.
Which of the following oils is the standard oil used by OEM's in r-134a systems?
a. mineral oil
b. ccot
c. ester oil
d. pag Correct Ans - d.
Tech a says the lines before and after the receiver/dryer should be the same temperature. tech b says the lines before and after the evaporator should be the same temperature. a. tech a
b. tech b
c. both
d. neither Correct Ans - a.
All of the following statements are true EXCEPT:
a. refrigerant leaves the compressor as a high pressure, high temperature vapor.
b. moisture and contaminants are removed by the receiver/drier, where the moisture is stored until it is needed
c. the expansion valve controls the flow of refrigerant into the evaporator.
d. warm air passing through the evaporator causes heat to be absorbed into the refrigerant. Correct Ans - b.
Tech a says if an air conditioning system has too much refrigerant oil, the performance of the system will suffer. tech b says poor system performance can be caused by an overcharge of refrigerant in the system. who is right?
a. tech a
b. tech b
c. both
d. neither Correct Ans - c.
A customer complains that the air conditioning system cools satisfactorily during the early morning or late evening, but does not cool during the hot part
of the day. during testing, the low side gauge starts out reading normal, then drops into a vacuum. tech a says that ice could be forming on the expansions valve. tech b says that the drier could be saturated with moisture. who is right?
a. tech a
b. tech b
c. both
d. neither Correct Ans - c.
A customer complains about engine coolant loss. the cooling system is pressurized at 15 psi for 15 minutes. there is no visible sign of coolant leaks in
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