ASE A7 Questions and Answers
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 - 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 - 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 - 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 - 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 - 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. - 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 - 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 - 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 the engine or
passenger compartments, but the pressure on the tester gauge decreases to 5 psi. this
problem could be caused by any of the following defects EXCEPT:
a. a leaking heater core
b. a leaking internal transmission cooler.
c. a leaking head gasket
d. a cracked cylinder head - b.
the vacuum valve in the radiator cap is stuck closed. the result of this problem could be:
a. an upper radiator hose collapsed after the engine was shut off
b. excessive cooling system pressure at normal engine temperature
c. engine overheating when operating under a heavy load
d. engine overheating during extended idle periods. - a.
after the recovery of an a/c system with a recovery machine, which of these statements
is true of the systems conditions?
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 - 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 - 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 - 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 - 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 - 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. - 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 - 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 - 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 the engine or
passenger compartments, but the pressure on the tester gauge decreases to 5 psi. this
problem could be caused by any of the following defects EXCEPT:
a. a leaking heater core
b. a leaking internal transmission cooler.
c. a leaking head gasket
d. a cracked cylinder head - b.
the vacuum valve in the radiator cap is stuck closed. the result of this problem could be:
a. an upper radiator hose collapsed after the engine was shut off
b. excessive cooling system pressure at normal engine temperature
c. engine overheating when operating under a heavy load
d. engine overheating during extended idle periods. - a.
after the recovery of an a/c system with a recovery machine, which of these statements
is true of the systems conditions?
