NEVADA C-21B AIR CONDITIONING
CONTRACTOR EXAMINATION TEST 2026 FULL
QUESTIONS AND CORRECT ANSWERS
◉ Device to connect to a gas heating thermocouple to test it under
no load condition. Answer: Ohmmeter
◉ Safety equipment when using a nitrogen cylinder for leak
detection. Answer: Pressure regulator
◉ Smaller single port connection of a reversing valve. Answer:
Accumulator
◉ Employing service technicians under a contractor's license.
Answer: A misuse of the license
◉ Difference between condensing temperature and liquid line
temperature in an R-22 system. Answer: 15 degree subcooling
◉ Maximum velocity allowed in a flex return duct. Answer: 900 fpm
◉ Purpose of economizers. Answer: To allow outside air to be used
for cooling in mild weather
, ◉ Minimum height appliances must be installed above the earth.
Answer: 6 inches
◉ Duration for a standing pressure test on a system over 10 tons.
Answer: 24 hours
◉ Static pressure exerted by R410A at 100 degrees F. Answer: 217
psig
◉ Net summer heat gain through the west window in the dining
room. Answer: 318 btuh
◉ Metering device used for a constant load condition. Answer:
Thermostatic Expansion Valve
◉ What should be introduced to copper tubing prior to brazing.
Answer: Nitrogen
◉ Location of upper opening for natural ventilation in a garage.
Answer: 24 inches
◉ Position of certified contractor deemed 'responsible in charge'.
Answer: Corporate officer or partner
CONTRACTOR EXAMINATION TEST 2026 FULL
QUESTIONS AND CORRECT ANSWERS
◉ Device to connect to a gas heating thermocouple to test it under
no load condition. Answer: Ohmmeter
◉ Safety equipment when using a nitrogen cylinder for leak
detection. Answer: Pressure regulator
◉ Smaller single port connection of a reversing valve. Answer:
Accumulator
◉ Employing service technicians under a contractor's license.
Answer: A misuse of the license
◉ Difference between condensing temperature and liquid line
temperature in an R-22 system. Answer: 15 degree subcooling
◉ Maximum velocity allowed in a flex return duct. Answer: 900 fpm
◉ Purpose of economizers. Answer: To allow outside air to be used
for cooling in mild weather
, ◉ Minimum height appliances must be installed above the earth.
Answer: 6 inches
◉ Duration for a standing pressure test on a system over 10 tons.
Answer: 24 hours
◉ Static pressure exerted by R410A at 100 degrees F. Answer: 217
psig
◉ Net summer heat gain through the west window in the dining
room. Answer: 318 btuh
◉ Metering device used for a constant load condition. Answer:
Thermostatic Expansion Valve
◉ What should be introduced to copper tubing prior to brazing.
Answer: Nitrogen
◉ Location of upper opening for natural ventilation in a garage.
Answer: 24 inches
◉ Position of certified contractor deemed 'responsible in charge'.
Answer: Corporate officer or partner
