HVAC TEST QUESTIONS AND ANSWERS | VERIFIED

Two locations where a cold air return should be installed - open area of a wall and low to the ground Which of the following is the law of thermodynamics? - heat moves toward a place with lower intensity Sensible heat describes - how hot something feels Latent heat is measured in - british thermal units What is the amount of heat energy required to evaporate 1 pound of water? - 970 btu In an air conditioning system and refrigeration system, what occurs in the evaporator? - the refrigerant absorbs the latent heat In an air conditioning system and refrigeration system, what occurs in the condenser? - the refrigerant releases the latent heat In a sealed system, pressure and temperature - follow each other up and down Which of the follow is not a type of compressor? lateral reciprocating rotary screw centrifugal - lateral In Fahrenheit, the boiling point of water is - 212 degrees To change Fahrenheit to Celsius, which formula is used? - C= (F-32) /1.8Which is not a method by which heat may be transferred from a warmer substance to a colder substance - retraction What btu of heat is required to raise 1 pound of ice 1 degree F when the temperature is below 32 degrees F? - .5 What btu of heat is required to raise 1 pound of steam 1 degree F above the temperature of 212 degrees F? - .5 A day-ton of refrigeration is the amount of refrigeration produced by melting 1 ton of ice at a temperature of 32 degrees F in 24 hours - true Ice exerts pressure - downwards Pressure is usually measured in - pounds per square inch Atmospheric pressure, at sea level, is 14.7 psia - true When one rises into the atmosphere, the atmospheric pressure decreases by 1 psi for every - 2,343 feet Vaporization can be increased by ------- the pressure on a liquid - reducing Every mechanical refrigeration system has ---- different pressure levels - 2