Air Conditioning Certification Exam (Exam Code A-02)

Heat which causes a change in temperature of a substance is called; - answersensible heat. Heat which causes a change in state of a material without a change in temperature is called; - answerlatent heat. Heat which is added to a vapor after the change of state occurs is called; - answersuperheat. Heat can travel by; - answerconduction, convection, radiation. The movement of heat by way of fluid (or air) is called; - answerconvection . The movement of heat by direct contact is called; - answerconduction . The standard unit for measuring the quantity of heat in a substance is; - answerthe British Thermal Unit (Btu). A refrigerat gives up heat when; - answerit condenses. It is desirable for refrigerant in the suction line to be slightly superheated in order to; - answerinsure liquid refrigerant does not enter the compressor. The state of refrigerant in the suction line should be; - answerlow pressure/ low temperature.