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UNIT 12 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX
12-1) Briefly explain the fundamentals principles that make the compression-
refrigeration cycle work.
12-2) List the four major components of the compression refrigeration cycle in order.
12-3) What components are responsible for maintaining the high and low pressures in
a compression refrigeration system?
12-4) Where in the compression refrigeration cycle is the refrigerant superheated?
12-5) Why is superheating desirable?
12-6) Where in the compression refrigeration cycle is the refrigerant subcooled?
12-7) Why is subcooling desirable?
12-8) Where in the compression refrigeration cycle is the refrigerant saturated?
12-9) Explain the heat balance in a compression cycle refrigeration system.
12-10) What is the difference between a liquid receiver and a suction accumulator?
12-11) List some of the optional components that can be found on the high side of a
refrigeration system.
12-12) List some of the optional components that can be found on the low side of a
refrigeration system.
12-13) List the types of compressors and briefly explain how they operate.
Reciprocating – uses pistons in a cylinder. Gas is compressed by squeezing it
between the piston and a valve plate at the top of the cylinder.
12-14) List the three types of air cooled condensers and briefly explain the difference
between them.
12-15) List the different type of water cooled condensers
12-16) What are the two large classes of metering devices?
12-17) Which type of metering device provides the most efficient operation?
12-18) Compare coil design between older, less efficient air conditioning systems and
newer high SEER air conditioning systems?
12-19) Name the three common refrigerant lines found on compression systems.
12-20) Which line is the larger of the two lines going to the compressor?
12-21) Which two lines connect the inside and outside units of a split system?
12-22) Why is the refrigeration cycle called a cycle?
12-23) Draw the basic refrigeration cycle. Label the four main components and the
refrigerant lines. List the pressure, temperature, and state going in and out of each
