NATE INDUSTRY COMPETENCY EXAM COMMERCIAL REFRIGERATIO
LATEST EXAM 2024 ACTUAL EXAM 100 QUESTIONS AND CORRECT D
TAILED ANSWERS
Study online at https://quizlet.com/_fgbn0r
1. With the condensing pressure and compressor D
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.
2. An indication of non-condensable gas in a refrigera- D
tion 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.
3. An automatic expansion valve controls refrigerant A
flow to an evaporator by maintaining a constant:
a. Suction pressure.
b. Pressure differential across the valve port.
c. Liquid line pressure.
d. Superheat.
4. What is the approximate compression ratio of a com- B
pressor operating at 35 psig suction pressure and
135 psig discharge pressure?
a. 1:03.
b. 3:01.
c. 1:04.
d. 4:01.
, NATE INDUSTRY COMPETENCY EXAM COMMERCIAL REFRIGERATIO
LATEST EXAM 2024 ACTUAL EXAM 100 QUESTIONS AND CORRECT D
TAILED ANSWERS
Study online at https://quizlet.com/_fgbn0r
5. The BTUs rejected at the condenser are always D
greater than the heat absorbed in the evaporator be-
cause:
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.
6. A unit cooler is inspected and found to be completely A
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.
7. what is the correct gauge pressure corresponding to A
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.
8. For a lineup of medium temperature case, an evap- B
orator temperature 0f 23°F is needed. The following
conditions exist:
· The suction line pressure drop is equivalent to ap-
proximately 2°F.
· The liquid line pressure drop is equivalent to 1°F.
, NATE INDUSTRY COMPETENCY EXAM COMMERCIAL REFRIGERATIO
LATEST EXAM 2024 ACTUAL EXAM 100 QUESTIONS AND CORRECT D
TAILED ANSWERS
Study online at https://quizlet.com/_fgbn0r
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.
9. What is true of systems with multiple evaporators at A
different temperatures?
a. It is required to install evaporator pressure regula-
tor(s).
b. The compressor discharge pressure will be a func-
tion of the coldest space.
c. It is required to install a head pressure control
valve.
d. It is required to install a crankcase pressure regu-
lator.
10. If charging a system by subcooling, what metering C
devices is installed?
a. Capillary tube.
b. Restrictor.
c. Thermostatic expansion valve.
d. Fixed orifice.
11. The most critical refrigerant line with respect to siz- C
ing for compressor performance is the:
a. Liquid line.
b. Discharge line.
c. Suction line.
d. Bypass line.
12. In a liquid line, excess pressure drop can cause: B
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