NATE CORE EXAM 2026 QUESTION
COLLECTION HVAC SYSTEM COMPONENTS
MODULE SOLVED ITEMS AND RESPONSE KEY
◉ What can be used to calculate the relative humidity, dew point,
and other properties of the air? Answer: The difference between the
wet-bulb and the dry-bulb temperature.
◉ Explain the effects of relative humidity. Answer: By increasing the
humidity during the heating season, the evaporation of moisture is
slowed, therefore you feel warmer and vice versa.
◉ What is the digital psychrometer able to do? Answer: It is capable
of reading dry-bulb and wet-bulb temperature and %RH.
◉ How do you find absolute pressure? Answer: Gauge pressure +
14.7PSI
◉ What does a pressure gauge use as the operating element?
Answer: A bourdon tube.
,◉ Describe the manifold gauge set. Answer: On the right = High
pressure (Liquid) (discharge gauge) (Red) On the left = Compound
or suction gauge (Blue) (Vapor)
◉ What is often used to measure pressure drop? (The difference in
pressure between two points.) Answer: Differential pressure gauges.
◉ What can differential pressure gauges do? Answer: They can
calculate air flow. They can help you determine how clean or dirty a
coil or filter is. Provides simultaneous pressure and flow
measurements
◉ Before you charge a system with refrigerant or after you have
replaced a component or repaired a leak, you should? Answer:
Remove all air and moisture from the system.
◉ How do you remove noncondensables, air, and moisture from a
system? Answer: Drawing a deep vacuum with a vacuum pump.
◉ What measurement is used to measure a vacuum? Answer:
Microns.
◉ The size of a micron is? Answer: 1/1,000 mm (0.001 mm)
, ◉ How many microns are in 1 in? Answer: 25,400 microns.
◉ What can be used to measure pressures at low levels? Answer: An
electronic vacuum gauge.
◉ Different leak detection methods are? Answer: Soap bubbles.
Ultrasonic devices. Electronic leak detectors.
◉ Which leak detection method is not as sensitive as the other
methods? Answer: Soap bubbles.
◉ What is used to remove refrigerant from a system properly?
Answer: Recovery machines.
◉ What is used to weigh-in a refrigerant charge properly and also to
record refrigerant removed for proper record keeping under the EPA
rules? Answer: Scales.
◉ What are pressure gauges used for? Answer: To determine the
static pressure in a duct system or the pressure drop across various
system components. Such as blowers, filters, coils, and heat
exchangers.
COLLECTION HVAC SYSTEM COMPONENTS
MODULE SOLVED ITEMS AND RESPONSE KEY
◉ What can be used to calculate the relative humidity, dew point,
and other properties of the air? Answer: The difference between the
wet-bulb and the dry-bulb temperature.
◉ Explain the effects of relative humidity. Answer: By increasing the
humidity during the heating season, the evaporation of moisture is
slowed, therefore you feel warmer and vice versa.
◉ What is the digital psychrometer able to do? Answer: It is capable
of reading dry-bulb and wet-bulb temperature and %RH.
◉ How do you find absolute pressure? Answer: Gauge pressure +
14.7PSI
◉ What does a pressure gauge use as the operating element?
Answer: A bourdon tube.
,◉ Describe the manifold gauge set. Answer: On the right = High
pressure (Liquid) (discharge gauge) (Red) On the left = Compound
or suction gauge (Blue) (Vapor)
◉ What is often used to measure pressure drop? (The difference in
pressure between two points.) Answer: Differential pressure gauges.
◉ What can differential pressure gauges do? Answer: They can
calculate air flow. They can help you determine how clean or dirty a
coil or filter is. Provides simultaneous pressure and flow
measurements
◉ Before you charge a system with refrigerant or after you have
replaced a component or repaired a leak, you should? Answer:
Remove all air and moisture from the system.
◉ How do you remove noncondensables, air, and moisture from a
system? Answer: Drawing a deep vacuum with a vacuum pump.
◉ What measurement is used to measure a vacuum? Answer:
Microns.
◉ The size of a micron is? Answer: 1/1,000 mm (0.001 mm)
, ◉ How many microns are in 1 in? Answer: 25,400 microns.
◉ What can be used to measure pressures at low levels? Answer: An
electronic vacuum gauge.
◉ Different leak detection methods are? Answer: Soap bubbles.
Ultrasonic devices. Electronic leak detectors.
◉ Which leak detection method is not as sensitive as the other
methods? Answer: Soap bubbles.
◉ What is used to remove refrigerant from a system properly?
Answer: Recovery machines.
◉ What is used to weigh-in a refrigerant charge properly and also to
record refrigerant removed for proper record keeping under the EPA
rules? Answer: Scales.
◉ What are pressure gauges used for? Answer: To determine the
static pressure in a duct system or the pressure drop across various
system components. Such as blowers, filters, coils, and heat
exchangers.
