NATE CORE QUESTIONS WITH COMPLETE SOLUTIONS GRADED TO PASS

When explaining to a customer that you have topped off the system charge, which of the following terms is most appropriate? - 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. - All of the above (clear, complete, concise) The ability to utilize all types of communication skills is _____ to the HVACR technician - Very important Listening carefully to what a customer is telling you _____. - Can help you diagnose the problem When you arrive at a service call and meet the customer, you should ______. - Listen to the customer first, than ask questions What is the volume of a room measures 10ft by 20ft with an 8ft ceilings? - 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? - 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? - 1,600 cfm What is the cross-sectional area of a 10 in round metal duct? - 79 in2 How fast does air with a velocity pressure of 0.20 in w.g. move through a round duct? - 1,800 ft/min How fast does air move with a velocity pressure of 0.20 in w.g. move through a square duct? - 1,800 ft/min Customers depend on you to be _______. - All of the above (honest, loyal, patient) Before leaving a service call, you should be sure to ______. - Demonstrate system operation and describe basic maintenance procedures to the customers What is the advantage of using a tube cutter to cut copper pipe? - 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 ______. - Soft drawn copper A flaring tool is used to ________. - Make a mechanical joint in tubing A swaging tool is used to _______. - Solder tubing without the use of couplings What is one of the advantages of a glass-stem thermometer? - It is very accurate In discussing human comfort, the temperature most commonly referred to is _______. - Dry-bulb A sling psycrometer uses two glass-stem thermometers. One measures dry-bulb, and the other measures ________. - Wet-bulb A standard refrigeration manifold uses what type of element to measure pressures? - Bourdon tube What is the pressure range of a standard compound gauge on a refrigeration manifold? - 30 in. Hg to 350 psig What is the best tool for removing moisture and non-condensibles from a system before adding refrigerant - Vacuum pump A vacuum gauge reads pressure in _______. - Microns Which of the following is not a method of leak detection? - Micronic To prevent the release of refrigerant to the atmosphere while removing it from a system, what type of equipment must be used? - Recovery machine An anemometer uses a small fan blade to measure _______. - Air velocity What is one of the advantages of using silver brazing rods for copper to copper joints? - No flux is required "Housekeeping" includes ________. - All of the above (Disposal of waste, fire prevention and protection, proper storage of materials) What type of eye protection should you wear when drilling overhead? - Goggles Wat agency regulates cylinders and chemicals transported in a service vehicle? - DOT (Department of Transportation) Material safety Data Sheet _________. - Contain information about personal protective equipment When should oxygen be used in a refrigeration system? - Never What is the maximum safe storage temperature of a refrigerant cylinder filled to 80% capacity by weight? - 125 degrees F Which of the following classifications of fire extinguishers should be used for electrical fires? - C Which of the following categories could be considered a hazardous atmosphere in a confined space? - All of the Above (Asphyxiating, Flammable, Toxic) Which of the following best describes an asphyxiating atmosphere? - Low oxygen levels 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? - 5 Ft