Commercial Refrigeration Final Study Guide with Complete Solutions
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Course
Commercial Refrigeration
Institution
Commercial Refrigeration
Commercial Refrigeration Final Study Guide with Complete SolutionsCommercial Refrigeration Final Study Guide with Complete SolutionsCommercial Refrigeration Final Study Guide with Complete SolutionsCommercial Refrigeration Final Study Guide with Complete Solutions
The evaporator in a refrigeration...
Refrigerants that boil off at different rates are called zeotropic blends. - ANSWER -
True
R-22 is considered a low pressure refrigerant. - ANSWER - False
High superheat means your TXV is flooding the coil. - ANSWER - False
The fastest defrost method is hot gas defrost. - ANSWER - True
Hot gas and electric defrost use the same time clock. - ANSWER - True
, If you are a refrigeration technician, a warm coat, hat and gloves should be in your
truck even in the middle of the summer. - ANSWER - True
The voltage that opens the point of a potential real is called the drop-out voltage. -
ANSWER - True
Good ventilation is important when working around refrigeration equipment
because modern refrigerants ______________ . - ANSWER - Are heavier than air and
may displace the oxygen around you
A thermostatic expansion valve controls refrigerant flow to the evaporator based on
____________ . - ANSWER - Rate of liquid vaporization, evaporator suction line
superheat, and external equalizer pressure.
The start capacitor is wired in series with the start relay. - ANSWER - True
Walk-in box temperature box is not needed when calculating the TD of an
evaporator coil. - ANSWER - False
The contacts in a current type starting relay are normally closed. - ANSWER - False
A motor can burn-out if the supply voltage is either too high or too low. - ANSWER -
True
A run capacitor helps a compressor run efficiently by slightly energizing the start
winding. - ANSWER - True
The suction and discharge valves in a reciprocating compressor open and close
depending on the difference in pressure across them. - ANSWER - True
When setting a fan cycle switch, you should set the cut-out to a pressure equivalent
to 90 degrees condensing temperature. - ANSWER - True
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