Air conditioning Certification practice test Questions With Complete Solutions Graded A+

What is the movement of heat through space called? - Answer-Radiation A refrigerant release heat when - Answer-It condenses Why is it desirable for refrigerant in the suction line to be slightly superheated? - Answer-To insure liquid refrigerant does not enter the compressor A 30 pound cylinder of reclaimed R-22 refrigerant has been stored over night at 70 degrees F. What should be the approximate pressure in the cylinder? - Answer-121 psig 14.7 psia( pouds per square inch absolute) is - Answer-Approximately 0 PSIG What is the main fuction of an air condition condenser? - Answer-To remove heat from the refrigerant Refrigerant R-134a vapor enters the condenser at 124 psig, 100 degrees F. It leaves the condenser at 80 degreesF. What will be the approximate pressure? - Answer-124 psig (the pressure should not change entering or leaving the condenser) Which of the following CANNOT be used as a low ambient temperature control? - Answer-Crankcase regulating valve When testing the efficiency of a (10 seer are lower) air cooled condenser, the refrigerant condensing temperature should be no more than_______ higher than the entering air temperature - AnswerApproximately 30 degrees F When testing the efficiency of a water cooled condenser, the refrigerant condensing temperature should be no more _____ higher than the leaving water temperature. - Answer-10 degrees FWhat does a temperature differential across a filter-drier indicate? - Answer-Restricted filter-drier Which of the following symptoms would be indicative of an oil logged evaporator? - Answer-Reduce heat transfer through the walls of the coil When using an electronic leak detecto, the sensor probe - Answer-should be moved at approximately 1 inch per second Before a vapor / compression system is opened for service - Answer-the refrigerant must be recovered using approved equipment What is the minimum vertical drop from the outlet of the condensate drain pan to the inlet of the P trap when the evaporator is ahead of the blower? - Answer-3 inches The temperature rise method of determining air volume CFM is mostly used with a/an; - Answer-electric resistive heat air handler What is a sling psychrometer used to measure - Answer-wet and dry bulb temperature