NATE CORE EXAM – Questions With Accurate
Solutions
When explaining to a customer that you have topped off the system charge,
which of the following terms is most appropriate? ✔️Ans - Refrigerant
It is important to be _____ in filling out service orders so that office staff, other
technicians, and customers will know what work you completed on the job.
✔️Ans - All of the above (clear, complete, concise)
The ability to utilize all types of communication skills is _____ to the HVACR
technician ✔️Ans - Very important
Listening carefully to what a customer is telling you _____. ✔️Ans - Can help
you diagnose the problem
When you arrive at a service call and meet the customer, you should ______.
✔️Ans - Listen to the customer first, than ask questions
What is the volume of a room measures 10ft by 20ft with an 8ft ceilings?
✔️Ans - 1,600 ft3
What is the cfm requirements for an 1,800-ft2 house with 8ft ceilings , if 5 air
changes per hour are needed? ✔️Ans - 1,200 cfm
What is the cfm requirement for an 2,400-ft2 house with 8ft ceilings, if five air
changes per hour are needed? ✔️Ans - 1,600 cfm
What is the cross-sectional area of a 10 in round metal duct? ✔️Ans - 79
in2
How fast does air with a velocity pressure of 0.20 in w.g. move through a
round duct? ✔️Ans - 1,800 ft/min
How fast does air move with a velocity pressure of 0.20 in w.g. move through
a square duct? ✔️Ans - 1,800 ft/min
, Customers depend on you to be _______. ✔️Ans - All of the above (honest,
loyal, patient)
Before leaving a service call, you should be sure to ______. ✔️Ans -
Demonstrate system operation and describe basic maintenance procedures to
the customers
What is the advantage of using a tube cutter to cut copper pipe? ✔️Ans - All
of the above (It can cut hard or soft drawn copper, It leaves no metal shavings
to contaminate the system, It produces a clean, square cut)
Spring-type benders may be used on ______. ✔️Ans - Soft drawn copper
A flaring tool is used to ________. ✔️Ans - Make a mechanical joint in tubing
A swaging tool is used to _______. ✔️Ans - Solder tubing without the use of
couplings
What is one of the advantages of a glass-stem thermometer? ✔️Ans - It is
very accurate
In discussing human comfort, the temperature most commonly referred to is
_______. ✔️Ans - Dry-bulb
A sling psycrometer uses two glass-stem thermometers. One measures dry-
bulb, and the other measures ________. ✔️Ans - Wet-bulb
A standard refrigeration manifold uses what type of element to measure
pressures? ✔️Ans - Bourdon tube
What is the pressure range of a standard compound gauge on a refrigeration
manifold? ✔️Ans - 30 in. Hg to 350 psig
What is the best tool for removing moisture and non-condensibles from a
system before adding refrigerant ✔️Ans - Vacuum pump
A vacuum gauge reads pressure in _______. ✔️Ans - Microns
Which of the following is not a method of leak detection? ✔️Ans - Micronic
Solutions
When explaining to a customer that you have topped off the system charge,
which of the following terms is most appropriate? ✔️Ans - Refrigerant
It is important to be _____ in filling out service orders so that office staff, other
technicians, and customers will know what work you completed on the job.
✔️Ans - All of the above (clear, complete, concise)
The ability to utilize all types of communication skills is _____ to the HVACR
technician ✔️Ans - Very important
Listening carefully to what a customer is telling you _____. ✔️Ans - Can help
you diagnose the problem
When you arrive at a service call and meet the customer, you should ______.
✔️Ans - Listen to the customer first, than ask questions
What is the volume of a room measures 10ft by 20ft with an 8ft ceilings?
✔️Ans - 1,600 ft3
What is the cfm requirements for an 1,800-ft2 house with 8ft ceilings , if 5 air
changes per hour are needed? ✔️Ans - 1,200 cfm
What is the cfm requirement for an 2,400-ft2 house with 8ft ceilings, if five air
changes per hour are needed? ✔️Ans - 1,600 cfm
What is the cross-sectional area of a 10 in round metal duct? ✔️Ans - 79
in2
How fast does air with a velocity pressure of 0.20 in w.g. move through a
round duct? ✔️Ans - 1,800 ft/min
How fast does air move with a velocity pressure of 0.20 in w.g. move through
a square duct? ✔️Ans - 1,800 ft/min
, Customers depend on you to be _______. ✔️Ans - All of the above (honest,
loyal, patient)
Before leaving a service call, you should be sure to ______. ✔️Ans -
Demonstrate system operation and describe basic maintenance procedures to
the customers
What is the advantage of using a tube cutter to cut copper pipe? ✔️Ans - All
of the above (It can cut hard or soft drawn copper, It leaves no metal shavings
to contaminate the system, It produces a clean, square cut)
Spring-type benders may be used on ______. ✔️Ans - Soft drawn copper
A flaring tool is used to ________. ✔️Ans - Make a mechanical joint in tubing
A swaging tool is used to _______. ✔️Ans - Solder tubing without the use of
couplings
What is one of the advantages of a glass-stem thermometer? ✔️Ans - It is
very accurate
In discussing human comfort, the temperature most commonly referred to is
_______. ✔️Ans - Dry-bulb
A sling psycrometer uses two glass-stem thermometers. One measures dry-
bulb, and the other measures ________. ✔️Ans - Wet-bulb
A standard refrigeration manifold uses what type of element to measure
pressures? ✔️Ans - Bourdon tube
What is the pressure range of a standard compound gauge on a refrigeration
manifold? ✔️Ans - 30 in. Hg to 350 psig
What is the best tool for removing moisture and non-condensibles from a
system before adding refrigerant ✔️Ans - Vacuum pump
A vacuum gauge reads pressure in _______. ✔️Ans - Microns
Which of the following is not a method of leak detection? ✔️Ans - Micronic
