Certification Test for A_C the complete solutions.
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Course
AC Express
Institution
AC Express
Heat flow, Heat absorption, Pressure and Boiling Points
On which of the following laws of nature is the air-conditioning system based?
D. None of these answers are correct
Which of the following statements is not correct?
A. Refrigerant leaves the compressor as a high-pressure, high-tempe...
Heat flow, Heat absorption, Pressure and Boiling Points - ANSWER- On which of
the following laws of nature is the air-conditioning system based?
D. None of these answers are correct - ANSWER- Which of the following
statements is not correct?
A. Refrigerant leaves the compressor as a high-pressure, high-temperature liquid.
B. Refrigerant leaves the condenser as a low-pressure, high-temperature liquid.
C. Refrigerant returns to the compressor as a low-pressure, high-temperature
vapor.
D. None of these answers are correct.
C. The accumulator is located between the condenser and the receiver/dryer. -
ANSWER- Which of the following statements is not correct?
A. The condenser is normally mounted in front of the radiator.
B. The receiver/dryer is a storage tank for liquid refrigerant from the condenser.
C. The accumulator is located between the condenser and the receiver/dryer.
D. All answers are correct
C. R-12 is destructive to Earth's ozone layer - ANSWER- Which of the following
statements concerning R-12 is correct?
A. R-12 is a hydroflurocarbon.
B.R-12 boils at 0 degrees Fahrenheit (-18 Celsius)
C. R-12 is destructive to Earth's ozone layer
D. All answers are correct
Ambient temperature switch, Thermostatic switch, Pressure cycling switch -
ANSWER- Which of the following may be electrically connected in series with the
compressor electromagnetic clutch?
,PAG oil - ANSWER- Which of the following oils can be used in an R-134a system?
C. receiver/dryer - ANSWER- A heating system includes all of the following parts
except:
A. heater core B. ventilation system
C. receiver/dryer D. distribution plenum
A. The evaporator changes heated refrigerant to a liquid. - ANSWER- Which of the
following statements is NOT correct?
A. The evaporator changes heated refrigerant to a liquid.
B. Automatic temperature controls maintain a set passenger compartment
temperature.
C. Air- conditioning/heater systems can be computer controlled.
D.Heaters and air-conditioners use the same plenum chambers.
cable, thermostat, and vacuum motor - ANSWER- Heater control valves are
operated by a ___________________.
-459 degrees Fahrenheit (-273 degrees Celsius) - ANSWER- All materials or
substances, as cold as ________________, have heat in them.
C. Both A and B - ANSWER- Technician A says the thermostatic expansion valve
and the fixed orifice tube perform the same function. Technician B says heat from
the evaporator core surface is lost to the boiling and vaporizing refrigerant. Who
is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
C. Both A and B - ANSWER- Technician A says suction lines connect the
accumulator to the compressor. Technician B says discharge lines connect the
compressor to the condenser. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
D. Neither A nor B - ANSWER- Technician A says the normal operating pressures
of R-134a are slightly lower than the pressures of R-12. Technician B says R-134a
boils at 134 degrees Fahrenheit. Who is correct?
, A. A only
B. B only
C. Both A and B
D. Neither A nor B
C. Both A and B - ANSWER- A poor heat condition is being discussed. Technician
A says the coolant level in the engine's cooling system may be low. Technician B
says the engine's thermostat may be faulty. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
B. High-pressure vapor leaves the evaporator at the top. - ANSWER- Which of the
following statements concerning evaporators is NOT true?
A. Low- pressure liquid enters the evaporator at the bottom.
B. High-pressure vapor leaves the evaporator at the top.
C. The evaporator is located underneath the dash.
D. Air passing over the evaporator loses its heat to the cooler surface of the core.
B. B only - ANSWER- A poor heat condition is being discussed. Tech A says a
disconnected engine vacuum hose could not cause the problem. Tech B says a
seized blend door could cause the problem. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
C. Both A and B - ANSWER- Tech A says R-12 air-conditioning technicians must
be certified. Tech B says R-12 air-conditioning equipment must be certified. Who
is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
A. A only - ANSWER- Tech A says R-12 is a chlorofluorocarbon (CFC) that
damages Earth's ozone layer. Tech B says R-134a is a hydroflurocarbon (HFC)
that causes even greater damage. Who is correct?
A. A only
B. B only
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