NATE AC Service Certification Exam, Latest 2026 ||
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A system is supplied from the factory with charge of 5 pounds
10 ounces for a 15 foot line set. The line set is 25 feet long. The
manufacturer's instruction sheet specifies 0.6 ounces of
refrigeration to be added for each added foot of refrigerant line
set length. What is the total refrigerant charge for the system?
A. 6
ounces
B. 5
pounds
C. 5 pounds 10
ounces
D. 6 pounds - ANSWER-D. 6
pounds
15ft - 25ft = 10ft x .6 = 6
ounces
5 pounds + 10 ounces + 6
ounces
,5 pounds + 16 ounces = 6
pounds
During an annual service check up, it is discovered that there
is a moderate
amount of resistance on a "bellyband" crankcase heater.
What does this
condition
indicate?
A. The crankcase heater will operate
B. Line voltage is insufficient.
C. Supply wires are oversized.
D. Duct heaters are operating properly. - ANSWER-*A
If an air conditioning system needs to operate in a low ambient
condition, the condenser may become too efficient. What
happens to condenser operation and what can be done to
counteract this condition?
A. The head pressure becomes too low and the superheat
needs to be lowered
B. The head pressure becomes too low and the superheat
needs to be raised
C. The head pressure becomes too low and the condenser fan
motor needs to be slowed or stopped
D. The suction pressure becomes too high and a low ambient
controller will lower it - ANSWER-*B
,Will a Capacitor Start-Capacitor Run (CSCR) motor that
has an open run
capacitor
start?
A. No, it would be unable to start without the run capacitor
B. It may start, but it draws a higher than normal running
current
C. Yes, it will start, but it will run backwards
D. It can only start if the voltage is higher - ANSWER-*A
Which microfarad value indicates a good start capacitor rated
at 145-175 mfd?
A. 130
B. 160
C.
180
D. 190 - ANSWER-B.
160
What effect does insufficient voltage have on a solenoid valve?
A. It causes flash gas
formation
B. The valve will operate
normally
C. The valve will remain
half open
, D. The valve will vibrate or chatter -
ANSWER-*D
What does a test of the compressor oil after a burnout indicate?
A.
Acidity
B.
Smoke
C.
Viscosity
D. Alkalinity - ANSWER-A.
Acidity
A system with a reciprocating compressor is pumped down and
the power is shut off. If the suction pressure rises very rapidly,
this is an indication that the:
A. system is overcharged.
B. system has a restriction in the refrigerant lines.
C. compressor valves are good.
D. compressor valves are defective. - ANSWER-*D
Which one of the following conditions can cause a
reduction from design
capacity in an air
conditioner?
A. An undersized suction line
Most Recent Exam 2026|2027 Actual Complete Real
Exam Questions And Correct Answers (Verified
Answers) Already Graded A+ | Guaranteed
Success!! Newest Exam | Just Released!!
A system is supplied from the factory with charge of 5 pounds
10 ounces for a 15 foot line set. The line set is 25 feet long. The
manufacturer's instruction sheet specifies 0.6 ounces of
refrigeration to be added for each added foot of refrigerant line
set length. What is the total refrigerant charge for the system?
A. 6
ounces
B. 5
pounds
C. 5 pounds 10
ounces
D. 6 pounds - ANSWER-D. 6
pounds
15ft - 25ft = 10ft x .6 = 6
ounces
5 pounds + 10 ounces + 6
ounces
,5 pounds + 16 ounces = 6
pounds
During an annual service check up, it is discovered that there
is a moderate
amount of resistance on a "bellyband" crankcase heater.
What does this
condition
indicate?
A. The crankcase heater will operate
B. Line voltage is insufficient.
C. Supply wires are oversized.
D. Duct heaters are operating properly. - ANSWER-*A
If an air conditioning system needs to operate in a low ambient
condition, the condenser may become too efficient. What
happens to condenser operation and what can be done to
counteract this condition?
A. The head pressure becomes too low and the superheat
needs to be lowered
B. The head pressure becomes too low and the superheat
needs to be raised
C. The head pressure becomes too low and the condenser fan
motor needs to be slowed or stopped
D. The suction pressure becomes too high and a low ambient
controller will lower it - ANSWER-*B
,Will a Capacitor Start-Capacitor Run (CSCR) motor that
has an open run
capacitor
start?
A. No, it would be unable to start without the run capacitor
B. It may start, but it draws a higher than normal running
current
C. Yes, it will start, but it will run backwards
D. It can only start if the voltage is higher - ANSWER-*A
Which microfarad value indicates a good start capacitor rated
at 145-175 mfd?
A. 130
B. 160
C.
180
D. 190 - ANSWER-B.
160
What effect does insufficient voltage have on a solenoid valve?
A. It causes flash gas
formation
B. The valve will operate
normally
C. The valve will remain
half open
, D. The valve will vibrate or chatter -
ANSWER-*D
What does a test of the compressor oil after a burnout indicate?
A.
Acidity
B.
Smoke
C.
Viscosity
D. Alkalinity - ANSWER-A.
Acidity
A system with a reciprocating compressor is pumped down and
the power is shut off. If the suction pressure rises very rapidly,
this is an indication that the:
A. system is overcharged.
B. system has a restriction in the refrigerant lines.
C. compressor valves are good.
D. compressor valves are defective. - ANSWER-*D
Which one of the following conditions can cause a
reduction from design
capacity in an air
conditioner?
A. An undersized suction line
