NATE AC Service Certification/ 99 Questions with Certified Solutions
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NATE AC Service Certification
Institution
NATE AC Service Certification
NATE AC Service Certification/ 99 Questions with Certified Solutions. Terms like:
The subcooling method for checking charge is generally used on air conditioners with what type of metering?
A. Only externally equalized thermostatic expansion valves
B. Any thermostatic expansion valve
C. Pi...
NATE AC Service Certification/ 99 Questions
with Certified Solutions
The subcooling method for checking charge is generally used on air conditioners
with what type of metering?
A. Only externally equalized thermostatic expansion valves
B. Any thermostatic expansion valve
C. Piston type
D. Any fixed metering device - Answer: B. Any thermostatic expansion valve
Supply ducts running through unconditioned space should be insulated and have:
A. equal friction.
B. excessive air velocity.
C. a vapor barrier.
Page 1 of 34
,D. a transition backing. - Answer: C. a vapor barrier.
An important consideration when installing a motorized economizer is to check to
be certain that:
A. the vanes are set for a maximum 10% outdoor air.
B. the vanes open on any call for cooling.
C. the vanes operate without binding.
D. the vanes are permanently set at 50%. - Answer: C. the vanes operate without
binding.
On a 3 ton unit installation, the measure airflow equals 1550 CFM. What does this
indicate?
A. Proper balancing
B. Low Airflow
C. Excess airflow
D. Improper balancing - Answer: C. Excess airflow(400cfm per ton, 3
ton=1200cfm)
Electronic type leak detectors typically have a push-button or knob for setting a
reference refrigerant level. This feature is useful for:
A. adjusting the detector after installing a new battery.
B. checking the factory calibration of the instrument.
Page 2 of 34
,C. setting the detector for use in environments with ambient refrigerant vapor.
D. adjusting the detector for the type refrigerant to be checked. - Answer: C.
setting the detector for use in environments with ambient refrigerant vapor.
What will refrigerant oil in a hose cause when a technician is checking the
pressures in an operation system with a manifold gauge set?
A. All readings on that gauge will increase in value.
B. All readings on that gauge will decrease in value.
C. All readings on that gauge will not be affected.
D. The gauge will read 0 psig. - Answer: C. All readings on that gauge will not be
affected.
Which measures duct static pressure?
A. Anemometer
B. Air balance hood
C. Mechanical velometer
D. Differential pressure gauge - Answer: C. Mechanical velometer
A duct 36 in. x 24 in. that has an average velocity of 600 fpm is handling:
A. 3600 CFM.
B. 2400 CFM.
C. 1200 CFM.
Page 3 of 34
, D. 1000 CFM. - Answer: A. 3600 CFM.
CFM = Velocity x Area (ft.^2)
CFM = 600fpm x ((36 x 24)/144)) (convert to sq. ft.)
CFM = 600fpm x 6sqft
CFM = 3600 CFM
What steps are necessary to clean a two row curved condenser coil?
A. Spray the coil from the inside of the condenser with a soap base coil cleaner
B. Spray the coil from the inside and the outside of the condenser with an acid
base cleaner
C. Brush the outside of the condenser with a bristle brush and water flush
D. Separate the two rows of coils, spray all surfaces with proper coil cleaner and
water flush - Answer: *D. Separate the two rows of coils, spray all surfaces with
proper coil cleaner and water flush
A residential supply diffuser that is noisy because of a loose vane is best serviced
by:
A. reducing the air volume.
B. changing the fan speed.
C. replacing the noisy vane.
D. replacing the diffuser. - Answer: D. replacing the diffuser.
Page 4 of 34
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