NATE: Core Essentials Exam Questions
And Answers
d (very important) - ANS The ability to utilize all types of communication skills is ____ to the
HVACR technician.
d (all of the above: clear, complete, concise) - ANS 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.
d (Refrigerant) - ANS When explaining to a customer that you have adjusted the system
charge, which of the following terms is most appropriate?
a (can help you diagnose the problem) - ANS Listening carefully to what a customer is
telling you ____.
b (listen to the customer first, then ask questions) - ANS When you arrive at a service call
and meet the customer, you should ____.
b (1,600 ft3) - ANS What is the volume of a room that measures 10 ft by 20 ft with an 8-ft
ceiling?
b (1,200 CFM) - ANS What is the CFM requirements for an 1,800-ft2 house with 8-ft
ceilings, if five air changes per hour are needed?
c (1,600 CFM) - ANS What is the CFM requirement for an 2,400-ft2 house with 8-ft
ceilings, if five air changes per hour are needed?
a (79 in2) - ANS What is the cross-sectional area of a 10-in round metal duct?
Note: Area of a circle = π x radius^2
d (1,800 ft/min) - ANS How fast does air with a velocity pressure of 0.20 in. w.g. move
through a round duct?
, Note: Velocity = 4005 x (the square root of velocity pressure)
d (1,800 ft/min) - ANS How fast does air with a velocity pressure of 0.20 in w.g. move
through a square duct?
Note: Velocity = 4005 x (the square root of velocity pressure)
d (all of the above: honest, loyal, patient) - ANS Customers depend on you to be ____.
c (demonstrate system operation and describe basic maintenance procedures to the customer)
- ANS Before leaving a service call, you should be sure to ____.
d (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.) - ANS What is the advantage of
using a tube cutter to cut copper pipe?
a (soft drawn copper) - ANS Spring-type benders may be used on ____.
a (make a mechanical joint in tubing) - ANS A flaring tool is used to ____.
d (solder tubing without the use of couplings) - ANS A swaging tool is used to ____.
a (It is very accurate) - ANS What is one of the advantages of a glass-stem thermometer?
b (dry-bulb) - ANS In discussing human comfort, the temperature most commonly referred
to is
d (wet-bulb) - ANS A sling psychrometer uses two glass-stem thermometers. One
measures dry-bulb, and the other measures ____.
b (Bourdon tube) - ANS A standard refrigeration manifold uses what type of element to
measure pressure?
d (Vacuum pump) - ANS What is the best tool for removing moisture and non-condensibles
from a system before adding refrigerant?
And Answers
d (very important) - ANS The ability to utilize all types of communication skills is ____ to the
HVACR technician.
d (all of the above: clear, complete, concise) - ANS 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.
d (Refrigerant) - ANS When explaining to a customer that you have adjusted the system
charge, which of the following terms is most appropriate?
a (can help you diagnose the problem) - ANS Listening carefully to what a customer is
telling you ____.
b (listen to the customer first, then ask questions) - ANS When you arrive at a service call
and meet the customer, you should ____.
b (1,600 ft3) - ANS What is the volume of a room that measures 10 ft by 20 ft with an 8-ft
ceiling?
b (1,200 CFM) - ANS What is the CFM requirements for an 1,800-ft2 house with 8-ft
ceilings, if five air changes per hour are needed?
c (1,600 CFM) - ANS What is the CFM requirement for an 2,400-ft2 house with 8-ft
ceilings, if five air changes per hour are needed?
a (79 in2) - ANS What is the cross-sectional area of a 10-in round metal duct?
Note: Area of a circle = π x radius^2
d (1,800 ft/min) - ANS How fast does air with a velocity pressure of 0.20 in. w.g. move
through a round duct?
, Note: Velocity = 4005 x (the square root of velocity pressure)
d (1,800 ft/min) - ANS How fast does air with a velocity pressure of 0.20 in w.g. move
through a square duct?
Note: Velocity = 4005 x (the square root of velocity pressure)
d (all of the above: honest, loyal, patient) - ANS Customers depend on you to be ____.
c (demonstrate system operation and describe basic maintenance procedures to the customer)
- ANS Before leaving a service call, you should be sure to ____.
d (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.) - ANS What is the advantage of
using a tube cutter to cut copper pipe?
a (soft drawn copper) - ANS Spring-type benders may be used on ____.
a (make a mechanical joint in tubing) - ANS A flaring tool is used to ____.
d (solder tubing without the use of couplings) - ANS A swaging tool is used to ____.
a (It is very accurate) - ANS What is one of the advantages of a glass-stem thermometer?
b (dry-bulb) - ANS In discussing human comfort, the temperature most commonly referred
to is
d (wet-bulb) - ANS A sling psychrometer uses two glass-stem thermometers. One
measures dry-bulb, and the other measures ____.
b (Bourdon tube) - ANS A standard refrigeration manifold uses what type of element to
measure pressure?
d (Vacuum pump) - ANS What is the best tool for removing moisture and non-condensibles
from a system before adding refrigerant?
