NATE ICE Test Questions with Certified Answers Graded A+

formula to convert celsius to fahrenheit - Answer: F = (1.8 x C) + 32 formula to convert fahrenheit to celsius - Answer: C = .56 (F - 32) specific heat - Answer: the amount of heat required to raise 1 lb of a substance 1 degree fahrenheit sensible heat - Answer: Is the heat that came be measured or sensed by a thermometer latent heat - Answer: hidden heat that changes the state of a substance Btu - Answer: The amount of heat requires to raise one pound of water one degree Fahrenheit The amount of heat that it takes to change 1 lb of 212 degrees Fahrenheit water to 1 lb of 212 steam is - Answer: 970 Btu that amount of heat requires to change 1 lb of 32 degrees Fahrenheit ice to 1 lb of 32 water is - Answer: 144 Btu conduction - Answer: Is the transfer of heat from one molecule to another convection - Answer: The transfer of heat from one place to another by fluid radiation - Answer: The transfer of heat from a heat source to a solid object through space one ton of refrigerant is equivalent to _____ But per hour - Answer: 12,000 when a substances changes from liquid to gas is - Answer: latent heat of vaporization when a substance changes from gas to a liquid is called - Answer: latent heat of condensation when a substance changes from a solid to a gas - Answer: sublimation an _____ refrigerant is a mixture of two or more refrigerants that performs as a single component refrigerant - Answer: azeotropic a _____ refrigerant is a mixture of two or more refrigerants that have different boiling points - Answer: near-azeotropic a _____ refrigerant is a mixture of two or more refrigerants that have different boiling points - Answer: zeotropic a _____ refrigerant is a blend of three refrigerants that acts as a zeotropic refrigerant - Answer: ternary zeotropic and near-azeotropic refrigerant must be charged into a system as a _____ or the refrigerant will change it's composition - Answer: liquid dewpoint line - Answer: used to measure superheat bubble like - Answer: used to measure subcooling temperature glide - Answer: The temperature difference between the vapor and liquid state of a near-azeotropic, a zeotropic, and ternary blend refrigerant an zeotropic refrigerant has a temperature glide of _____ - Answer: zero a near-azeotropic refrigerant has a temperature glide above _____ up to _____ degrees fahrenheit - Answer: * zero * 10 _____ occurs when a zeotropic or a ternary refrigerant is added to a system as a gas - Answer: fractionation mineral oils are often referred to as _____ oils - Answer: petroleum mineral oils are most commonly used with - Answer: CFC refrigerants synthetic oils are _____ chemicals produced to function as lubricants - Answer: man-made synthetic lubricants absorbs more _____ than a mineral oil - Answer: moisture polyol ester lubercants should be stored in their own container because _____ can permeate through certain materials - Answer: maisture polyol ester oils is the only lubricant suitable to use with _____ - Answer: R-134A