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Heat which causes a change in temperature of a substance is called : Sensible Heat Heat added to a substance without a rise in temperature is called : Latent Heat Heat added to refrigerant in a vapor state after the evaporation process is called : Superheat A scroll compressor moved refrigerant by means of : Involute spirals The movement of heat by way of fluid is called : Convection The movement of heat through a solid object is called : Conduction 2 | P a g e The standard unit for measuring the quantity of heat in a substance : British Thermal Unit A refrigerant gives up heat when it : Condenses Why must refrigerant in the suction line be slightly warmer than the saturation temperature? : Prevent liquid slugging of compressor It is desirable for refrigerant in the suction line to be slightly superheated in order to : Insure liquid refrigerant does not enter the compressor A mechanical shaft seal is necessary on : Semi-hermetic compressor Liquid slugging is : Liquid refrigerant in the compressor clearance space The clearance space in a reciprocating compressor : Varies depending on compressor speed 3 | P a g e Which of the following types of air conditioning compressors is most energy efficient : Centrifugal Which of the following represent the right order for the functions of a condenser? : De-superheat, condenses, sub-cools Refrigerant R-134a vapor enters the compressor at 124 psig, 100°f. It leaves as a liquid from the condenser sub-cooled 20°f, and the pressure will approximately : 18.4 psig There are 3 basic types of condensers, the air cooled, the water cooled, and the _______ cooled : Evaporative 10 lbs. of refrigerant passing through a water cooled condenser will lose 20 BTU's of heat per lb. If 10 lbs. of water passes through the condenser with an entering temperature of 80°f. The temperature of the water leaving the condenser is : 100°f The heat removed from the refrigerant by the condenser is : Both sensible and latent heat An energy recovery ventilator i