HVAC Practice Exam Questions Correctly
Answered and Updated!!!
The coolant bypass solenoid valve provides a second path for coolant to flow between
the engine block and the: - ANSWER Thermostat housing
The heater core is an air to liquid heat exchanger similar to a radiator. - ANSWER false
the 1.6l gtdi engine uses the no-flow coolant strategy in the engine block to: - ANSWER
Both a and b
on vehicles equipped with the auto start-stop feature, such as the 2014 fusion, the cabin
heater coolant pump will only operate when: - ANSWER engine coolant temperature is
above 60*c (140*f)
the 2014 c-max uses a catalytic converter exhaust manifold with coolant passages to: -
ANSWER raise coolant temperature to expedite passenger compartment heating on
hybrid electric vehicles.
The 1.0l gtdi engine used in the 2014 fiesta is equipped with an electric coolant pump.
what conditions must be met for the pcm to activate the electric coolant pump? -
ANSWER Both A and B
Selecting the highest heat setting on the climate control module is one condition that
must be met to operate the electric booster heater system - ANSWER true
vehicles such as the fusion energi and c-max energi, use the cabin coolant heater system
to provide the heater core with coolant to warm the passenger compartment when: -
ANSWER during all these conditions
,the auxiliary heater assembly uses what module to control the electrical supply to the
heating elements? - ANSWER AHCM
The electric booster heater system used on the 2014 fiesta will activate two relays to
power how many heating elements inside the electric booster heater? - ANSWER 3
On hybrid vehicles, the cabin heater coolant pump will provide coolant to engine
components when the engine is running. - ANSWER True
the cabin heater diverter valve is controlled by the pcm and is used to - ANSWER isolate
the heater circuit from the engine cooling circuit to improve heater performance.
which supplemental heating system uses a heating element to warm the air in the hvac
housing? - ANSWER both a and b
latent heat of condensation occurs in the refrigerant system - ANSWER the condenser
extracts heat from the refrigerant into the outside air
latent heat of vaporization occurs in the refrigerant system when - ANSWER refrigerant
changes state from a low-pressure liquid to a low-pressure vapor inside the evaporator.
what process causes matter to change states without a change in temperature? -
ANSWER latent heat
latent or hidden heat occurs when - ANSWER heat added to the boiling water is hidden
from the thermometer.
, A day when the outside temperature is 21*c (70*f) with 30% humidity feels hotter than
a day with 32*c (90*f) temperature at 5% humidity - ANSWER true
changing the pressure of a liquid changes its - ANSWER both a and b
what causes a liquid to change into a vapor - ANSWER heat
technician A says the expansion valve uses an internal diaphragm filled with a
temperature sensitive fluid to monitor evaporator temperature. technician B says the
expansion valve has a temperature sensing bulb located near the outlet port of the
evaporator. who is correct - ANSWER both a and b
what style of electrically powered conmpressor is used on hybrid and electric vehicles -
ANSWER scroll
which of the following statements does not apply to the suction accumulator? -
ANSWER uses a desiccant bag to remove moisture from the refrigerant on the high side
of the system.
the A/C system is divided into two sides: a low-pressure or suction side and high-
pressure or discharge side. what component separates the two sides? - ANSWER TXV or
fixed orifice tube
the pressure readings taken when the A/C system is not operating is called: - ANSWER
static pressure
what is the main difference between a variable scroll and fixed scroll compressor? -
ANSWER a variable scroll uses a control valve to adjust output capacity
Answered and Updated!!!
The coolant bypass solenoid valve provides a second path for coolant to flow between
the engine block and the: - ANSWER Thermostat housing
The heater core is an air to liquid heat exchanger similar to a radiator. - ANSWER false
the 1.6l gtdi engine uses the no-flow coolant strategy in the engine block to: - ANSWER
Both a and b
on vehicles equipped with the auto start-stop feature, such as the 2014 fusion, the cabin
heater coolant pump will only operate when: - ANSWER engine coolant temperature is
above 60*c (140*f)
the 2014 c-max uses a catalytic converter exhaust manifold with coolant passages to: -
ANSWER raise coolant temperature to expedite passenger compartment heating on
hybrid electric vehicles.
The 1.0l gtdi engine used in the 2014 fiesta is equipped with an electric coolant pump.
what conditions must be met for the pcm to activate the electric coolant pump? -
ANSWER Both A and B
Selecting the highest heat setting on the climate control module is one condition that
must be met to operate the electric booster heater system - ANSWER true
vehicles such as the fusion energi and c-max energi, use the cabin coolant heater system
to provide the heater core with coolant to warm the passenger compartment when: -
ANSWER during all these conditions
,the auxiliary heater assembly uses what module to control the electrical supply to the
heating elements? - ANSWER AHCM
The electric booster heater system used on the 2014 fiesta will activate two relays to
power how many heating elements inside the electric booster heater? - ANSWER 3
On hybrid vehicles, the cabin heater coolant pump will provide coolant to engine
components when the engine is running. - ANSWER True
the cabin heater diverter valve is controlled by the pcm and is used to - ANSWER isolate
the heater circuit from the engine cooling circuit to improve heater performance.
which supplemental heating system uses a heating element to warm the air in the hvac
housing? - ANSWER both a and b
latent heat of condensation occurs in the refrigerant system - ANSWER the condenser
extracts heat from the refrigerant into the outside air
latent heat of vaporization occurs in the refrigerant system when - ANSWER refrigerant
changes state from a low-pressure liquid to a low-pressure vapor inside the evaporator.
what process causes matter to change states without a change in temperature? -
ANSWER latent heat
latent or hidden heat occurs when - ANSWER heat added to the boiling water is hidden
from the thermometer.
, A day when the outside temperature is 21*c (70*f) with 30% humidity feels hotter than
a day with 32*c (90*f) temperature at 5% humidity - ANSWER true
changing the pressure of a liquid changes its - ANSWER both a and b
what causes a liquid to change into a vapor - ANSWER heat
technician A says the expansion valve uses an internal diaphragm filled with a
temperature sensitive fluid to monitor evaporator temperature. technician B says the
expansion valve has a temperature sensing bulb located near the outlet port of the
evaporator. who is correct - ANSWER both a and b
what style of electrically powered conmpressor is used on hybrid and electric vehicles -
ANSWER scroll
which of the following statements does not apply to the suction accumulator? -
ANSWER uses a desiccant bag to remove moisture from the refrigerant on the high side
of the system.
the A/C system is divided into two sides: a low-pressure or suction side and high-
pressure or discharge side. what component separates the two sides? - ANSWER TXV or
fixed orifice tube
the pressure readings taken when the A/C system is not operating is called: - ANSWER
static pressure
what is the main difference between a variable scroll and fixed scroll compressor? -
ANSWER a variable scroll uses a control valve to adjust output capacity
