ESCO Air Conditioning Certification Practice Test Air conditioning Certification practice Exam 2025 Graded A +

ESCO Air Conditioning Certification Practice Test Air conditioning Certification practice Exam 2025 Graded A + What is the movement of heat through space called? - Correct Answer-Radiation A refrigerant release heat when - Correct Answer-It condenses Why is it desirable for refrigerant in the suction line to be slightly superheated? - Correct 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? - Correct Answer 121 psig 14.7 psia( pouds per square inch absolute) is - Correct Answer-Approximately 0 PSIG What is the main fuction of an air condition condenser? - Correct 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? - Correct 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? - Correct 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 - Correct Answer-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 Answer-10 degrees F What does a temperature differential across a filter-drier indicate? - Correct Answer Restricted filter-drier Which of the following symptoms would be indicative of an oil logged evaporator? - Correct Answer-Reduce heat transfer through the walls of the coil Air Air When using an electronic leak detecto, the sensor probe - Correct Answer-should be moved at approximately 1 inch per second Before a vapor / compression system is opened for service - Correct 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? - Correct Answer-3 inches The temperature rise method of determining air volume CFM is mostly used with a/an; - Correct Answer-electric resistive heat air handler What is a sling psychrometer used to measure - Correct Answer-wet and dry bulb temperature A compressor is operating with a discharge pressure of 235.3 psig and a suction pressure of 35.3 psig. What is the compression ratio (pumping ratio)? - Correct Answer 5:1 (235.3+14.7=250) and (35.3+14.7=50) so 250/5=5 What method does hot gas bypass refer to? - Correct Answer-Capacity control IF a TEV sensing bulb has lost of its charge, What effect would this have on the air conditioning system - Correct Answer-It would cause the low side pressure to decrease An increase in water flow, when using a water cooled condenser, would - Correct Answer-decrease the operating discharge pressure The clearance space in reciprocating compressor - Correct Answer-has an effect on compressor capacity What is used to control the flow of water on a water-cooled condenser? - Correct Answer-A water regulating valve How should metallic vibration eliminators be installed on a system which uses a reciprocating compressor? - Correct Answer-parallel to the compressor crankshaft The total amount of heat contained in one pound of a substance calculated from an accepted temperature base is called - Correct Answer-enthalpy If non-condensables are trapped in a condenser, what symptoms will be present? - Correct Answer-Increased heat build-up, high amperage and high discharge pressure. Many multi-cylinder reciprocating compressor have a capacity control device called; - Correct Answer-un-loaders Air Air A pilot-operated pressure regulator uses_________ pressure to operate the valve. - Correct Answer-suction gas A low-side float metering device is used________. - Correct Answer-on a flooded evaporator In a direct expansion (DX) evaporator system, refrigerant leaves the evaporator as ______. - Correct Answer-superheated vapor When setting a high pressure cut-out on a R-22 system which has an air cooled condenser, the setting should be approximately _______. - Correct Answer-395 psig. The cutout must be set approximately 50% above the operating pressure When is the installation of a "P" trap mandatory in a drain line? - Correct Answer-When the evaporator coil is located on the negative side of the blower. A pump-down system should have a (an); - Correct Answer-liquid receiver. What is a liquid receiver used for? - Correct Answer-To store liquid refrigerant The oil pressure safety switch is operated by _________. - Correct Answer-the difference between crankcase pressure and oil pump pressure Which of the following is the opening force on a water regulating valve being used on a water cooled condenser? - Correct Answer-The high side pressure What is the "G" terminal used for on a heating and cooling thermostat? - Correct Answer-The blower relay. When should a thermostatic expansion valve with an external equalization line be used? - Correct Answer-When the evaporator has a pressure drop that causes more than 2°F saturation temperature change An thermal expansion valve that is stuck wide open will cause ___________. - Correct Answer-a flooded evaporator A properly functioning condenser should always have ______________ leaving the condenser; - Correct Answer-sub-cooled, liquid Tube within a tube, shell and coil, and shell and tube are all types of: - Correct Answer water cooled condensers. What is one of the main reasons that reciprocating compressors are not 100% efficient? - Correct Answer-clearance volume Air Air Where is an open drive compressor most likely to develop a refrigerant leak? - Correct Answer-shaft seal The automatic expansion valve (AEV) maintains a constant ______ in the evaporator. - Correct Answer-pressure Short cycling during pump down can be caused by: - Correct Answer-a leaking compressor suction valve What is a crankcase heater used to prevent? - Correct Answe