Air conditioning Certification practice test (A+ Graded)

What is the movement of heat through space called? correct answers Radiation A refrigerant release heat when correct answers It condenses Why is it desirable for refrigerant in the suction line to be slightly superheated? correct answers 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? correct answers 121 psig 14.7 psia( pouds per square inch absolute) is correct answers Approximately 0 PSIG What is the main fuction of an air condition condenser? correct answers 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? correct answers 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? correct answers 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 correct answers Approximately 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. correct answers 10 degrees F What does a temperature differential across a filter-drier indicate? correct answers Restricted filter-drier Which of the following symptoms would be indicative of an oil logged evaporator? correct answers Reduce heat transfer through the walls of the coil When using an electronic leak detecto, the sensor probe correct answers should be moved at approximately 1 inch per second Before a vapor / compression system is opened for service correct answers 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? correct answers 3 inches