10/23/24, 8:26 PM NATE INDUSTRY COMPETENCY EXAM COMMERCIAL REFRIGERATION LATEST EXAM 2024 ACTUAL EXAM 100 QUESTIO…
NATE INDUSTRY COMPETENCY EXAM
COMMERCIAL REFRIGERATION LATEST EXAM
2024 ACTUAL EXAM 100 QUESTIONS AND
CORRECT DETAILED ANSWERS
Terms in this set (100)
With the condensing D
pressure and 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.
https://quizlet.com/961577159/nate-industry-competency-exam-commercial-refrigeration-latest-exam-2024-actual-exam-100-questions-and-correct-d… 1/46
,10/23/24, 8:26 PM NATE INDUSTRY COMPETENCY EXAM COMMERCIAL REFRIGERATION LATEST EXAM 2024 ACTUAL EXAM 100 QUESTIO…
An indication of non- D
condensable gas 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 A
valve controls 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.
https://quizlet.com/961577159/nate-industry-competency-exam-commercial-refrigeration-latest-exam-2024-actual-exam-100-questions-and-correct-d… 2/46
,10/23/24, 8:26 PM NATE INDUSTRY COMPETENCY EXAM COMMERCIAL REFRIGERATION LATEST EXAM 2024 ACTUAL EXAM 100 QUESTIO…
The BTUs rejected at the D
condenser 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.
https://quizlet.com/961577159/nate-industry-competency-exam-commercial-refrigeration-latest-exam-2024-actual-exam-100-questions-and-correct-d… 3/46
, 10/23/24, 8:26 PM NATE INDUSTRY COMPETENCY EXAM COMMERCIAL REFRIGERATION LATEST EXAM 2024 ACTUAL EXAM 100 QUESTIO…
A unit cooler is inspected A
and found to 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 A
pressure 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.
https://quizlet.com/961577159/nate-industry-competency-exam-commercial-refrigeration-latest-exam-2024-actual-exam-100-questions-and-correct-d… 4/46
NATE INDUSTRY COMPETENCY EXAM
COMMERCIAL REFRIGERATION LATEST EXAM
2024 ACTUAL EXAM 100 QUESTIONS AND
CORRECT DETAILED ANSWERS
Terms in this set (100)
With the condensing D
pressure and 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.
https://quizlet.com/961577159/nate-industry-competency-exam-commercial-refrigeration-latest-exam-2024-actual-exam-100-questions-and-correct-d… 1/46
,10/23/24, 8:26 PM NATE INDUSTRY COMPETENCY EXAM COMMERCIAL REFRIGERATION LATEST EXAM 2024 ACTUAL EXAM 100 QUESTIO…
An indication of non- D
condensable gas 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 A
valve controls 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.
https://quizlet.com/961577159/nate-industry-competency-exam-commercial-refrigeration-latest-exam-2024-actual-exam-100-questions-and-correct-d… 2/46
,10/23/24, 8:26 PM NATE INDUSTRY COMPETENCY EXAM COMMERCIAL REFRIGERATION LATEST EXAM 2024 ACTUAL EXAM 100 QUESTIO…
The BTUs rejected at the D
condenser 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.
https://quizlet.com/961577159/nate-industry-competency-exam-commercial-refrigeration-latest-exam-2024-actual-exam-100-questions-and-correct-d… 3/46
, 10/23/24, 8:26 PM NATE INDUSTRY COMPETENCY EXAM COMMERCIAL REFRIGERATION LATEST EXAM 2024 ACTUAL EXAM 100 QUESTIO…
A unit cooler is inspected A
and found to 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 A
pressure 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.
https://quizlet.com/961577159/nate-industry-competency-exam-commercial-refrigeration-latest-exam-2024-actual-exam-100-questions-and-correct-d… 4/46
