C
HVAC NATE HEAT PUMP verified A+ questions and
answers.
Terms in this set (97)
The three processes that Radiation
transfer heat energy are
conduction, convection and
________
a. Concentration.
b. Radiation.
c. Refraction.
d. Static pressure.
Which of the following factors All of the above
affects a customer's level of
comfort?
a. Air movement.
b. Humidity.
c. Temperature.
d. All of the above.
A cooling load calculation + 15%
estimates the sensible heat gain
of a structure. The
maximum sensible capacity of
a cooling- only system should
be within ____________ % of
the
calculated value.
a. ± 10%
b. + 10%
c. + 15%
d. + 30 %
,The maximum sensible cooling + 25%
capacity of a heat pump should
be within ____________ % of
the
calculated sensible heat gain of
the structure with a large
heating load.
a. ± 10%
b. + 15%
c. - 25%
d. + 25%
The combined output of a heat 15%
pump and its auxiliary heat
should not exceed the
calculated heat loss of a home
by more than _.
a. 10%
b. 15%
c. 20%
d. 25%
What amount of auxiliary 3.2 kWh
electric heat is needed when
the output of a heat pump
on a design day is 18,800 Btuh
and the heat loss of the home is
29,700 Btuh?
a. 2.1 kWh.
b. 3.2 kWh.
c. 5.0 kWh.
d. 10.9 kWh.
What effect does raising the The refrigerant's boiling point increases
pressure in a sealed system
have on refrigerant?
a. It becomes difficult to subcool
the liquid refrigerant.
b. It becomes more difficult to
,superheat the refrigerant
vapor.
c. The refrigerant's boiling point
decreases.
d. The refrigerant's boiling point
increases.
What is the primary danger to Suffocation caused by the heavier refrigerant displacing the oxygen in the
people near an accidental air
refrigerant release or spill?
a. Blurred vision caused by the
refrigerant vapor coming in
contact with the eyes.
b. Changes in weather patterns
caused by global warming.
c. Damage to the food chain caused
by
decreased ozone levels in the
stratosphere.
d. Suffocation caused by the heavier
refrigerant displacing the oxygen
in the air.
, The maximum temperature at 125°F 80%
which
refrigerant may be stored is °F
when
the container is no more than %
full of
liquid.
a. 120°F 60%
b. 125°F 60%
c. 125°F 80%
d. 135°F 80%
Boiling of refrigerant occurs in Evaporator
which system component?
a. Compressor.
b. Condenser.
c. Evaporator.
d. Metering device.
Why is superheat necessary in It insures that dry vapor reaches the compressor so that
a system that utilizes hermetic mechanical damage does not occur.
compressors?
a.It insures that dry vapor
reaches the
compressor so that mechanical
damage does not occur.
b. It increases system capacity
significantly.
c. It prevents liquid
refrigerant from gassing
the metering device.
d. Superheat is necessary only
when open compressors are
being used.
HVAC NATE HEAT PUMP verified A+ questions and
answers.
Terms in this set (97)
The three processes that Radiation
transfer heat energy are
conduction, convection and
________
a. Concentration.
b. Radiation.
c. Refraction.
d. Static pressure.
Which of the following factors All of the above
affects a customer's level of
comfort?
a. Air movement.
b. Humidity.
c. Temperature.
d. All of the above.
A cooling load calculation + 15%
estimates the sensible heat gain
of a structure. The
maximum sensible capacity of
a cooling- only system should
be within ____________ % of
the
calculated value.
a. ± 10%
b. + 10%
c. + 15%
d. + 30 %
,The maximum sensible cooling + 25%
capacity of a heat pump should
be within ____________ % of
the
calculated sensible heat gain of
the structure with a large
heating load.
a. ± 10%
b. + 15%
c. - 25%
d. + 25%
The combined output of a heat 15%
pump and its auxiliary heat
should not exceed the
calculated heat loss of a home
by more than _.
a. 10%
b. 15%
c. 20%
d. 25%
What amount of auxiliary 3.2 kWh
electric heat is needed when
the output of a heat pump
on a design day is 18,800 Btuh
and the heat loss of the home is
29,700 Btuh?
a. 2.1 kWh.
b. 3.2 kWh.
c. 5.0 kWh.
d. 10.9 kWh.
What effect does raising the The refrigerant's boiling point increases
pressure in a sealed system
have on refrigerant?
a. It becomes difficult to subcool
the liquid refrigerant.
b. It becomes more difficult to
,superheat the refrigerant
vapor.
c. The refrigerant's boiling point
decreases.
d. The refrigerant's boiling point
increases.
What is the primary danger to Suffocation caused by the heavier refrigerant displacing the oxygen in the
people near an accidental air
refrigerant release or spill?
a. Blurred vision caused by the
refrigerant vapor coming in
contact with the eyes.
b. Changes in weather patterns
caused by global warming.
c. Damage to the food chain caused
by
decreased ozone levels in the
stratosphere.
d. Suffocation caused by the heavier
refrigerant displacing the oxygen
in the air.
, The maximum temperature at 125°F 80%
which
refrigerant may be stored is °F
when
the container is no more than %
full of
liquid.
a. 120°F 60%
b. 125°F 60%
c. 125°F 80%
d. 135°F 80%
Boiling of refrigerant occurs in Evaporator
which system component?
a. Compressor.
b. Condenser.
c. Evaporator.
d. Metering device.
Why is superheat necessary in It insures that dry vapor reaches the compressor so that
a system that utilizes hermetic mechanical damage does not occur.
compressors?
a.It insures that dry vapor
reaches the
compressor so that mechanical
damage does not occur.
b. It increases system capacity
significantly.
c. It prevents liquid
refrigerant from gassing
the metering device.
d. Superheat is necessary only
when open compressors are
being used.
