GCAP 2023 Questions With Correct Answers.

A refrigerant line contains Ammonia at the following conditions: 80F, 120 PSIG - Answer-The line contains vapor A low temperature Ammonia booster compressor normally operates with a discharge temperature of 120F. The temperature of the discharge vapor suddenly drops to 80F. What is indicated? - Answer-There is possibly liquid in the suction line Where can oil be drained from an Ammonia system - Answer-All the above the high pressure receiver, the low pressure receiver, oil pots and some evaporators for each pound of water evaporated, an evaporative condenser rejects - Answer-970 to 1057 BTU's A back pressure regulator is - Answer-a pressure controller The pressure/ temperature relationship for ammonia, obtained from a PT chart, is only valid when the ammonia in the section you are metering is - Answer-in a saturated condition An ammonia liquid line has liquid trapped and it's temp is starting to rise. How much will the PSIG pressure rise for every one degree F of heat exposure? (hydrostatic pressure increase) - Answer-100 to 150 psi How are temperature and heat related - Answer-temperature is a measure of the intensity of the heat in an object what fluid friction or vapor resistance sometimes known as line loss or pressure drop - Answer-the loss of pressure as the fluid/ vapor interacts with inner walls of the pipe in a recirculation system where is it important to keep a constant pump pressure - Answer-at the metering valve evaporator inletA home air conditioner is rated to remove 24,000 BTU's in 1 hour. What is its tonage - Answer-2 ton what is the king valve - Answer-first liquid manual closing valve leaving the HPR calculate the compression ratio from the following information: suction pressure 33 PSIG Discharge Pressure 181 PSIG - Answer-4.10:1 What pressure scale must be used to calculate a compression ratio - Answer-PSIA Approximately how many BTU's does it take to convert 1 pound of liquid water at 212F to steam at 212F - Answer-970 BTU's Approximately how many BTU's does it take to melt one pound of ice to water at 32F - Answer-144 BTU's An example of how a lava lamp works would be an example of what type of heat transfer - Answer-All the above: Radiant, conduction, convection what is specific heat (Cp) - Answer-it is the exact amount of heat that must be transferred to change 1 pound of a substance by 1F where should a superheated gas exist in all refrigeration systems - Answer-inlet of compressor where is the worst place to have a leak - Answer-high side liquid the compressor controls low side boiling temperature by controlling? - Answer-pressure a compressor is considered a - Answer-volume reducer a condenser converts the refrigerant from ______ to ____ when it removes heat - Answer-gas to liquidthe metering or expansion valve contols - Answer-flow to classify a metering valve as an actual expansion valve what must happen across the valve - Answer-all the above: pressure drop, temp drop, increase in velocity evaporators can be coolers, freezers, blast freezers, ice machines etc..., what is one common application to them all as the refrigerant absorbs heat - Answer-convert liquid to gas by absorbing heat