NATE Air Conditioning Installation & Service exam with correct answers 2024

NATE Air Conditioning Installation &
Service Practice Questions
A good evacuation of a refrigerant circuit to remove non-condensables will
helphigher
A.) insure: condensing
temperatures
B.) higher suction
pressures
C.) low suction line pressure
drop
D.) higher efficiency and capacity correct answers D.) higher efficiency
and capacity
A condensing unit should be mounted on a slab that is
level
A.) to: an accumulated water to evenly run out of
allow
the increase
B.) cabinet airflow through the fin
area
C.) prevent the unit from tipping
over
D.) make certain any top discharge air blows straight up correct answers
A.) allow any water to evenly run out of the
accumulated
cabinet
Low airflow over a residential split system air conditioning evaporator
canliquid
A.) cause: flood back to the
compressor
B.) a decrease in compression
ratio
C.) an increase in suction line
superheat
D.) oil logging in the evaporator correct answers A.) liquid flood back to the
compressor
Which of the following is the correct sequence
of work?
A.) Attach the gauge manifold, recover refrigerant, replace the filter core,
evacuate the
system, recharge the
system.
B.) Recover the refrigerant, evacuate the system, replace the filter core,
recharge the
syste
C.) Attach the gauge manifold, evacuate the system, replace the filter core,
m.
recover the recharge the
refrigerant,
system.
D.) Attach the gauge manifold, recharge the system, evacuate the system,
replace
filter the correct answers A.) Attach the gauge manifold, recover
core.
refrigerant,
the filter core,replace
evacuate the system, recharge the
system.
As the pressure on the liquid line is increased, the vaporization
temperature of the
liquid
:A.)
B.)
decreases
increases
C.) remains
unchanged
D.) varies correct answers B.)
increases
An oil separator must be
mounted:
A.)
level
B.) below the compressor
crankcase

, C.) above the compressor
crankcase
D.) in the suction line correct answers
A.) level
Which of the following metering devices controls evaporator
pressure?
A.) Thermostatic expansion
valve
B.) Fixed
orifice
C.) Low side
float
D.) None of these correct answers D.) None of
these
The purpose of the external equalizer on the thermostatic
expansion
A.) valve
to equalize is:
evaporator pressure drop with respect to
the to
B.) TEVequalize the evaporator
pressure
C.) to helpdrop
prevent liquid flood
back
D.) to allow the high side pressure to equalize to the low side when the
compressor
cycles off correct answers A.) to equalize evaporator pressure drop with
respect to the
TEV

The higher the MERV rating of a filter-
drier,
A.) theefficient the drier is at absorbing
more
moisture
B.) less efficient the drier is at absorbing
moisture
C.) smaller the particles the filter can
entrap
D.) MERV does not apply to filter-driers correct answers D.) MERV does not
apply to
filter
driers
Zeolite is used
with:
A.) refrigerant filter-
driers
B.) HEPA
filters
C.) pipe
threads
D.) solder correct answers A.) refrigerant
filter-driers
Vacuum pressures are
measured in:
A.)
microns
B.) millimeters of
mercury
C.) inches of
mercury
D.) all of the above correct answers D.) all of the
above
The number 25,400
relates to:
A.)
microns/inch
B.)
BTU/ton
C.)
CFM/HP
D.) CFM/ton correct answers A.)
microns/inch
The general rule of thumb for
airflow
A.) 400 is:
B.) 400
CFM/ton
CFM/HP
C.) 6 CFM/square
inch