NATE A/C Exam 2 Questions and Answers Graded A+

NATE A/C Exam 2 Questions and Answers Graded A+ The Fahrenheit scale is based on boiling water at sea level at what temperature? A: 459 degrees B: 212 degrees C: 180 degrees D: 100 degrees B: 212 degrees Zero pounds gauge corresponds on the absolute scale to: A: 144 B: 212 C: 14.7 D: zero C: 14.7 Hidden heat in refrigeration work is referred to as: A: Intensity of heat B: Latent heat C: Heat a thermometer can "sense" D: Cold B: Latent heat Absolute zero on the Fahrenheit scale is: A: 459 degrees B: 273 degrees C: 100 degrees D: 0 degrees A: 459 degrees A ton of refrigeration is a unit equal to: A: 2,880,000 btu per day B: 12,000 btu per hour C: 2,000 btu per minute D: All of these are correct B: 12,000 btu per hour The heat used to change a liquid to a gas is called the latent heat of: A: Absorption B: Vaporization C: Fusion D: Liquid B: Vaporization A thermometer is said to "sense" what? A: Heat of fusion B: Latent heat C: Sensible heat D: Specific heat C: Sensible heat Five pounds of water is heated by two degrees F. How many btu were added to the water? A: 25 btu B: 10 btu C: 5 btu D: 2 btu B: 10 btu Wght x deg raise = btu's 5 x 2 = 10 btu's The amount of heat required to melt one pound of ice at 32 degrees F is: A: 212 btu B: 180 btu C: 144 btu D: 970 btu C: 144 btu Superheat is added: A: In changing a liquid to a vapor B: In raising the temperature of water C: After all the liquid has been changed to vapor D: None of these is correct C: After all the liquid has been changed to vapor Subcooling is: A: Heat removed in changing the temperature of a liquid. B: Heat which causes a liquid to turn into a solid C: Heat removed from a liquid below 0 degrees F D: Heat removed below the subheat temperature A: Heat removed in changing the temperature of a liquid. The saturation temperature is: A: Never actually reached B: When water is at 0 degrees F C: The same as the condensing temperature and boiling temperature D: The reciprocal of the inverse of the superheat ratio C: The same as the condensing temperature and boiling temperature Cold is: A: Any temperature below 98.6 degrees F B: A temperature lower than 50 degrees F C: A relative term with no specific temperature D: A temperature near absolute zero C: A relative term with no specific temperature As the pressure over a liquid is lowered, _____________________.