Science Engineering Mechanical Engineering
8. NATE Industry Competency Exam
Commercial Refrigeration Exam Actual
2026 Newest Updated Questions and
Correct Answers (Latest
Update) (Verified Answers by Expert)
Terms in this set (100)
With the condensing pressure and D
compressor speed remaining constant,
a decrease in suction pressure will
cause a(n):
a. Decrease in compressor capacity
and decrease in current.
b. Increase in compressor capacity and
decrease in current.
c. Increase in compressor capacity and
increase in current.
d. Decrease in compressor capacity
and increase in current.
,An indication of non-condensable gas D
in a refrigeration system is significantly:
a. Lower-than-normal suction
pressures.
b. higher-than-normal suction
pressures.
c. Lower-than-normal head pressures.
d. higher-than-normal head pressures.
An automatic expansion valve controls A
refrigerant flow to an evaporator by
maintaining a constant:
a.Suction pressure.
b. Pressure differential across the
valve port.
c. Liquid line pressure.
d. Superheat.
What is the approximate B
compression ratio of a compressor
operating at 35 psig suction
pressure and 135 psig
discharge pressure?
a.1:03.
b. 3:01.
c. 1:04.
d. 4:01.
,The BTUs rejected at the condenser D
are always greater than the heat
absorbed in the evaporator because:
a.The condenser is mounted outside
with restricted airflow.
b. Of the high temperature of
the discharge vapor and length
of the discharge line.
c. Of the inefficiency of the condenser
and pressure drop in the discharge
line.
d. Of the heat of compression in
the compressor.
A unit cooler is inspected and found to A
be completely iced up. The heaters
and defrost timer are found to be
working properly. A technician should:
a.Adjust the defrost termination switch
to a higher temperature setting.
b.Adjust the thermostatic expansion
valve to a higher superheat setting.
c. Clear all of the ice from the coil and
find out why the coil is frosted.
d. Increase the frequency of
the defrost cycle.
what is the correct gauge pressure A
corresponding to an absolute pressure
of 24.7 psia at sea level?
a.10 psig.
b. 12.6 psig.
c. 39.4 psig.
d. 39.7 psig.
, For a lineup of medium B
temperature case, an evaporator
temperature 0f 23°F is needed.
The following conditions exist:
·The suction line pressure drop
is equivalent to approximately
2°F.
·The liquid line pressure drop
is equivalent to 1°F.
The compressor capacity should be
selected based on a saturated suction
temperature of:
a.20°F.
b. 21°F.
c. 23°F.
d. 25°F.
What is true of systems with multiple A
evaporators at different temperatures?
a. It is required to install evaporator
pressure regulator(s).
b.The compressor discharge pressure
will be a function of the coldest space.
c. It is required to install a
head pressure control valve.
d. It is required to install a
crankcase pressure regulator.
If charging a system by subcooling, C
what metering devices is installed?
a.Capillary tube.
b. Restrictor.
c.Thermostatic expansion valve.
d. Fixed orifice.
8. NATE Industry Competency Exam
Commercial Refrigeration Exam Actual
2026 Newest Updated Questions and
Correct Answers (Latest
Update) (Verified Answers by Expert)
Terms in this set (100)
With the condensing pressure and D
compressor speed remaining constant,
a decrease in suction pressure will
cause a(n):
a. Decrease in compressor capacity
and decrease in current.
b. Increase in compressor capacity and
decrease in current.
c. Increase in compressor capacity and
increase in current.
d. Decrease in compressor capacity
and increase in current.
,An indication of non-condensable gas D
in a refrigeration system is significantly:
a. Lower-than-normal suction
pressures.
b. higher-than-normal suction
pressures.
c. Lower-than-normal head pressures.
d. higher-than-normal head pressures.
An automatic expansion valve controls A
refrigerant flow to an evaporator by
maintaining a constant:
a.Suction pressure.
b. Pressure differential across the
valve port.
c. Liquid line pressure.
d. Superheat.
What is the approximate B
compression ratio of a compressor
operating at 35 psig suction
pressure and 135 psig
discharge pressure?
a.1:03.
b. 3:01.
c. 1:04.
d. 4:01.
,The BTUs rejected at the condenser D
are always greater than the heat
absorbed in the evaporator because:
a.The condenser is mounted outside
with restricted airflow.
b. Of the high temperature of
the discharge vapor and length
of the discharge line.
c. Of the inefficiency of the condenser
and pressure drop in the discharge
line.
d. Of the heat of compression in
the compressor.
A unit cooler is inspected and found to A
be completely iced up. The heaters
and defrost timer are found to be
working properly. A technician should:
a.Adjust the defrost termination switch
to a higher temperature setting.
b.Adjust the thermostatic expansion
valve to a higher superheat setting.
c. Clear all of the ice from the coil and
find out why the coil is frosted.
d. Increase the frequency of
the defrost cycle.
what is the correct gauge pressure A
corresponding to an absolute pressure
of 24.7 psia at sea level?
a.10 psig.
b. 12.6 psig.
c. 39.4 psig.
d. 39.7 psig.
, For a lineup of medium B
temperature case, an evaporator
temperature 0f 23°F is needed.
The following conditions exist:
·The suction line pressure drop
is equivalent to approximately
2°F.
·The liquid line pressure drop
is equivalent to 1°F.
The compressor capacity should be
selected based on a saturated suction
temperature of:
a.20°F.
b. 21°F.
c. 23°F.
d. 25°F.
What is true of systems with multiple A
evaporators at different temperatures?
a. It is required to install evaporator
pressure regulator(s).
b.The compressor discharge pressure
will be a function of the coldest space.
c. It is required to install a
head pressure control valve.
d. It is required to install a
crankcase pressure regulator.
If charging a system by subcooling, C
what metering devices is installed?
a.Capillary tube.
b. Restrictor.
c.Thermostatic expansion valve.
d. Fixed orifice.
