HVAC Quiz 5 Questions and Answers Rated A
Which filter is usually installed as an aftermarket compo-
in-line
nent?
Refrigerant filters will need to be replaced due to? debris from the compressor breakdown
R-134a works similarly to R-12 but operates at a
higher pressure
.
Which of the following is the only refrigerant approved by
R-134a
the EPA for use in automotive air conditioning systems?
Technician A says that when retrofitting, you must install a
new pressure-relief device that automatically releases re-
frigerant to the atmosphere. Technician B says that when
retrofitting, you need to use unique service fittings to Technician B
minimize the risk of cross-contamination on either the air
conditioning system or the recycle station. Which techni-
cian is correct?
provide an internal passage for circulating refrigerant and
Tube Plates
an external passage for incoming air
are metal surfaces that absorb heat and condense mois-
Fins ture from the ambient air that will be blown into the cabin
of the vehicle
refrigerant flows through multiple tubes from one side to
Single Pass
the other
refrigerant comes in one side and snakes back and forth
Multipass
within a single tube
Laminated Plates help prevent buildup of contaminants and mold
Technician A says that air passing through the evaporator
becomes cooler. Technician B says refrigerant that ab- Both Technicians A and B
sorbed the heat from the air in the evaporator becomes
1/8
, HVAC Quiz 5 Questions and Answers Rated A
warmer and turns into a vapor. Which technician is cor-
rect?
Heat from air transfers across the refrigerant tubes of the
convection
evaporator using a principle known as .
Similar to the condenser in that it consists of refrigerant
evaporator
coils mounted on thin cooling fins
Circulates air in the passenger cabin blower motor
Acts as a metering device that regulates the flow of liquid
orifice tube or TXV
refrigerant
absorbs and removes heat from the air of the passenger
What function does an evaporator perform?
cabin
Technician A says that if you can't remove the cabin air
filter, the blower motor, or the blower resistor to access
the evaporator core, you need to drill in the HVAC case.
Technician B says that you can also coat the evaporator Technician A
with a chemical coating using the afterblow feature that is
available in the HVAC control module. Which technician is
correct?
What is the primary function of TXV systems? control the refrigerant flow
The TXV is mounted at the to the evaporator. inlet
The external valve uses an line that connects
equalizer
to the evaporator outlet line.
The internal valve uses an internal equalizer passage to
evaporator
sense the inlet pressure.
What does TXV stand for? thermostatic expansion valve
1. diaphragm
2. capillary tube
2/8
Which filter is usually installed as an aftermarket compo-
in-line
nent?
Refrigerant filters will need to be replaced due to? debris from the compressor breakdown
R-134a works similarly to R-12 but operates at a
higher pressure
.
Which of the following is the only refrigerant approved by
R-134a
the EPA for use in automotive air conditioning systems?
Technician A says that when retrofitting, you must install a
new pressure-relief device that automatically releases re-
frigerant to the atmosphere. Technician B says that when
retrofitting, you need to use unique service fittings to Technician B
minimize the risk of cross-contamination on either the air
conditioning system or the recycle station. Which techni-
cian is correct?
provide an internal passage for circulating refrigerant and
Tube Plates
an external passage for incoming air
are metal surfaces that absorb heat and condense mois-
Fins ture from the ambient air that will be blown into the cabin
of the vehicle
refrigerant flows through multiple tubes from one side to
Single Pass
the other
refrigerant comes in one side and snakes back and forth
Multipass
within a single tube
Laminated Plates help prevent buildup of contaminants and mold
Technician A says that air passing through the evaporator
becomes cooler. Technician B says refrigerant that ab- Both Technicians A and B
sorbed the heat from the air in the evaporator becomes
1/8
, HVAC Quiz 5 Questions and Answers Rated A
warmer and turns into a vapor. Which technician is cor-
rect?
Heat from air transfers across the refrigerant tubes of the
convection
evaporator using a principle known as .
Similar to the condenser in that it consists of refrigerant
evaporator
coils mounted on thin cooling fins
Circulates air in the passenger cabin blower motor
Acts as a metering device that regulates the flow of liquid
orifice tube or TXV
refrigerant
absorbs and removes heat from the air of the passenger
What function does an evaporator perform?
cabin
Technician A says that if you can't remove the cabin air
filter, the blower motor, or the blower resistor to access
the evaporator core, you need to drill in the HVAC case.
Technician B says that you can also coat the evaporator Technician A
with a chemical coating using the afterblow feature that is
available in the HVAC control module. Which technician is
correct?
What is the primary function of TXV systems? control the refrigerant flow
The TXV is mounted at the to the evaporator. inlet
The external valve uses an line that connects
equalizer
to the evaporator outlet line.
The internal valve uses an internal equalizer passage to
evaporator
sense the inlet pressure.
What does TXV stand for? thermostatic expansion valve
1. diaphragm
2. capillary tube
2/8
