NATE FINAL EXAM #1 QUESTIONS WITH 100% CORRECT ANSWERS GRADED A+

Generally, vibration eliminators in piping should be installed: A: At a 45 degree angle B: At a 90 degree angle C: Perpendicular to the compressor crankshaft D: Parallel to the compressor crankshaft - D: Parallel to the compressor crankshaft If you purchased ten filter-driers for $100.00, what was the price of each filter-drier? A: $100.00 B: $10.00 C: $1.00 D: $1.10 - B: $10.00 Which of the following jobs requires safety glasses? A: Driving a vehicle B: Extending a ladder C: Brazing D: Pulling thermostat wire - C: Brazing Which of the following instruments would typically be used to measure a vacuum? A: Micron gauge B: Thermostat C: Anemometer D: Differential pressure gauge - A: Micron gauge ASHRAE Standard 34 deals with: A: Carbon monoxide safety levels B: Refrigerant quality C: Equipment room ventilation and alarms D: Refrigerant toxicity and flammability - D: Refrigerant toxicity and flammability ANSI/ASHRAE 34 published in 2001 and entitled "Designation and Safety Classification of Refrigerants". • Class A signifies refrigerants for which toxicity has not been identified at concentrations less than or equal to 400 ppm; • Class B signifies refrigerants for which there is evidence of toxicity at concentrations below 400 ppm. • Class 1 indicates refrigerants that do not show flame propagation when tested in air at 21°C and 101 kPa; • Class 2 indicates refrigerants having a lower flammability limit of more than 0.10 kg/m3 at 21°C and 101 kPa and a heat of combustion of less than 19 kJ/kg; • Class 3 indicates refrigerants that are highly flammable as defined by a lower flammability limit of less than or equal to 0.10 kg/m3 at 21°C and 101 kPa or a heat of combustion greater than or equal to 19 kJ/kg. What control would you use on a capillary tube or automatic expansion valve system to maintain the desired temperature? A: Dual pressure control B: High pressure control C: Thermostatic temperature control D: Low pressure control - C: Thermostatic temperature control The total heat contained in any substance is obtained by adding together its: A: Radiant and specific heat B: Latent and sensible heat C: Radiant and sensible heat D: Specific and latent heat - B: Latent and sensible heat An outdoor air conditioning condensing unit should not be located: A: In the sun B: On the side of the house C: Within 5 feet of a hose bib connection D: Where any objects or obstructions are within 5 feet of the condenser fan - D: Where any objects or obstructions are within 5 feet of the condenser fan