Air Conditioning Certification Exam (Exam Code A-02)

Heat which causes a change in temperature of a substance is called; - ans-sensible heat. Heat which causes a change in state of a material without a change in temperature is called; - ans-latent heat. Heat which is added to a vapor after the change of state occurs is called; - ans-superheat. Heat can travel by; - ans-conduction, convection, radiation. The movement of heat by way of fluid (or air) is called; - ans-convection . The movement of heat by direct contact is called; - ans-conduction . The standard unit for measuring the quantity of heat in a substance is; - ans-the British Thermal Unit (Btu). A refrigerat gives up heat when; - ans-it condenses. It is desirable for refrigerant in the suction line to be slightly superheated in order to; - ans-insure liquid refrigerant does not enter the compressor. The state of refrigerant in the suction line should be; - ans-low pr