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NATE Exam: Core Essentials Questions &
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The ability to utilize all types of communication skills is ____ to the HVACR technician. a. not as important as "hands-on" technical skills b. somewhat important c. unimportant d. very important ๐ธ๐ธ๐ธ : d (very important) 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. a. clear b. complete c. concise d. all of the above ๐ธ๐ธ๐ธ : d (all of the above: clear, complete, concise)
When explaining to a customer that you have adjusted the system charge, which of the following terms is most appropriate? a. Freon b. Gas c. Juice d. Refrigerant ๐ธ๐ธ๐ธ : d (Refrigerant) Listening carefully to what a customer is telling you ____. a. can help you diagnose the problem b. is a waste of time c. is not necessary d. often will only confuse you ๐ธ๐ธ๐ธ : a (can help you diagnose the problem) When you arrive at a service call and meet the customer, you should ____. a. ask questions first, then listen to what the customer has to say b. listen to the customer first, then ask questions c. avoid discussion with the customer d. remind the customer that you are the professional and get on with your work
b. 1,200 CFM c. 1,600 CFM d. 2,400 CFM ๐ธ๐ธ๐ธ : c (1,600 CFM) What is the cross-sectional area of a 10-in round metal duct? a. 79 in b. 200 in c. 314 in d. 418 in Note: Area of a circle = ฯ x radius^ ๐ธ๐ธ๐ธ : a ( 79 in 2 ) How fast does air with a velocity pressure of 0.20 in. w.g. move through a round duct? a. 400 ft/min b. 1,200 ft/min c. 1,600 ft/min d. 1,800 ft/min Note: Velocity = 4005 x (the square root of velocity pressure)
๐ธ๐ธ๐ธ : d (1,800 ft/min) How fast does air with a velocity pressure of 0.20 in w.g. move through a square duct? a. 400 ft/min b. 1,200 ft/min c. 1,600 ft/min d. 1,800 ft/min Note: Velocity = 4005 x (the square root of velocity pressure) ๐ธ๐ธ๐ธ : d (1,800 ft/min) Customers depend on you to be ____. a. honest b. loyal c. patient d. all of the above ๐ธ๐ธ๐ธ : d (all of the above: honest, loyal, patient) Before leaving a service call, you should be sure to ____. a. ask the customer for referrals
A flaring tool is used to ____. a. make a mechanical joint in tubing b. measure pipe diameters c. remove burrs from piping d. solder tubing without the use of coupling ๐ธ๐ธ๐ธ : a (make a mechanical joint in tubing) A swaging tool is used to ____. a. cut copper tubing b. make a mechanical joint in tubing c. remove burrs from piping d. solder tubing without the use of couplings ๐ธ๐ธ๐ธ : d (solder tubing without the use of couplings) What is one of the advantages of a glass-stem thermometer? a. It is very accurate b. It is very durable c. It comes with a digital readout d. Non of the above
๐ธ๐ธ๐ธ : a (It is very accurate) In discussing human comfort, the temperature most commonly referred to is ____. a. dew point b. dry-bulb c. wet-bulb d. Fahrenheit ๐ธ๐ธ๐ธ : b (dry-bulb) A sling psychrometer uses two glass-stem thermometers. One measures dry-bulb, and the other measures ____. a. dew point b. enthalpy c. relative humidity d. wet-bulb ๐ธ๐ธ๐ธ : d (wet-bulb) A standard refrigeration manifold uses what type of element to measure pressure? a. Bellows b. Bourdon tube
a. inches of mercury b. microns c. psia d. psig ๐ธ๐ธ๐ธ : b (microns) Which of the following is not a method of leak detection? a. Soap bubbles b. Electronic c. Micronic d. Ultrasonic ๐ธ๐ธ๐ธ : c (Micronic) To prevent the release of refrigerant to the atmosphere while removing it from a system, what type of equipment must be used? a. Recovery machine b. Recycling machine c. Reclaim machine d. Vacuum pump ๐ธ๐ธ๐ธ : a (Recovery machine)
An anemometer uses a small fan blade to measure ____. a. air pressure b. air velocity c. air volume d. static pressure ๐ธ๐ธ๐ธ : b (air velocity) What is one of the advantages of using silver brazing rods for copper-to-copper joints? a. A lower melting temperature is required b. A propane torch is normally used c. No flux is required d. No nitrogen purge is needed ๐ธ๐ธ๐ธ : c (No flux is required) "Housekeeping" includes ____. a. disposal of waste b. fire prevention and protection c. proper storage of materials d. all of the above ๐ธ๐ธ๐ธ : d (all of the above)
๐ธ๐ธ๐ธ : a (contain information about personal protective equipment) When should oxygen be used in a refrigeration system? a. To clear a restriction in the line b. To pressurize for leak-testing c. To purge lines for brazing d. Never ๐ธ๐ธ๐ธ : d (Never) Which of the following classifications of fire extinguishers should be used for electrical fires? a. A b. B c. C d. D ๐ธ๐ธ๐ธ : c (Class A is an "ordinary" fire that involves the burning of wood, paper, or textile products, extinguishing agent: water. Class B is a fire that contains oil, grease, paint, varnish, or other chemicals, extinguishing agent: foam. Class C is an electrical fire, extinguishing agent: carbon dioxide.)
Which of the following categories could be considered a hazardous atmosphere in a confined space? a. Asphyxiating b. Flammable c. Toxic d. All of the above ๐ธ๐ธ๐ธ : d (All of the above: asphyxiating, flammable, toxic) Which of the following best describes an asphyxiating atmosphere? a. Low oxygen level b. Presence of ammonia c. Presence of carbon monoxide d. Presence of nitrogen ๐ธ๐ธ๐ธ : a (Low oxygen level) If a ladder is placed against a wall that is 20 ft tall, what is the proper distance away from the wall for the base of the ladder? a. 3 ft b. 4 ft c. 5 ft
a. When current travels through a ground path other than the neutral b. When the circuit is overloaded c. When there is a short circuit d. All of the above ๐ธ๐ธ๐ธ : a (When current travels through a ground path other than the neutral) Proper lockout/tagout procedures state that locks placed on a lockout device may be removed ____. a. by anyone on the job site b. only by the person who installed the locks c. only after all fuses have been replaced d. only when the equipment is grounded ๐ธ๐ธ๐ธ : b (only by the person who installed the locks) A natural cooling process produced by moisture on the skin changing to low-pressure steam is called ____. a. conduction b. convection c. evaporation d. radiation
๐ธ๐ธ๐ธ : c (evaporation) During the heating season, human comfort can be enhanced without changing the temperature of the air by ____. a. adding moisture b. reducing moisture c. increasing air filtration d. increasing air speed ๐ธ๐ธ๐ธ : a (adding moisture) During the cooling season, dampers on bypass humidifiers should be ____. a. completely closed b. completely open c. set at 25% d. set at 50% ๐ธ๐ธ๐ธ : a (completely closed) All matter can exist as a ____. a. liquid b. solid
b. latent c. sensible d. super ๐ธ๐ธ๐ธ : b (latent) The amount of heat (Btu) needed to raise the temperate of 1 lb of a substance 1ยฐF is called the ____ heat of the substance. a. absolute b. latent c. sensible d. specific ๐ธ๐ธ๐ธ : d (specific) The latent heat of fusion is the amount of energy required to change 1 lb of a substance from the ____ phase to the ____ phase without changing its temperature. a. liquid, vapor b. liquid, solid c. solid, vapor d. vapor, liquid ๐ธ๐ธ๐ธ : b (liquid, solid)
At 32ยฐF, 1 lb of ice can be changed to 1 lb of water by adding ____ Btu. a. 32 Btu b. 44 Btu c. 144 Btu d. 970 Btu ๐ธ๐ธ๐ธ : c ( 144 Btu) At 212ยฐF, 1 lb of water can be changed to 1 lb of steam by adding ____ Btu. a. 32 Btu b. 44 Btu c. 144 Btu d. 970 Btu ๐ธ๐ธ๐ธ : d ( 970 Btu) When liquid and vapor phases of a substance exist together, and no more liquid can vaporize without more energy being added, the vapor is said to be ____. a. saturated b. stabilized c. subcooled d. superheated
