How are temperature and heat related? - ANSWER-Temperature is a measure of the intensity of the heat in an object
The amount of heat required to change the temperature of one pound of water one-degree Farenheit defines - ANSWER-a BTU
What is one ton of refrigeration equal to? - ANSWER-The rat...
RETA Test Questions &
Answers 100%
Correct!!
How are temperature and heat related? - ANSWER-Temperature is a measure of the intensity of the
heat in an object
The amount of heat required to change the temperature of one pound of water one-degree
Farenheit defines - ANSWER-a BTU
What is one ton of refrigeration equal to? - ANSWER-The rate of moving 288,000 BTUs per 24hrs
The boiling temperature of a liquid can be changed by - ANSWER-changing the pressure on the liquid
What does the compressor do? - ANSWER-Moves refrigerant from the low side to the high side
What does evaporation do? - ANSWER-Absorbs heat energy into the system
The four basic required components of a vapor compression refrigeration system are... - ANSWER-
compressor, condenser, evaporator, expansion device
Why should a valved-off refrigerant vessel not be filled completely full? - ANSWER-It may rupture
What is the principal advantage and disadvantages of ammonia as a refrigerant? - ANSWER-It is
readily available, but it is toxic
How can the exact point of a leak be found in an ammonia system? - ANSWER-A burning sulfer stick
, How can a leak be found in a halocarbon system - ANSWER-A halide torch or electronic leak detector
What should operators establisa as operational guidelines - ANSWER-Normal range of suction
pressure and discharge pressure
A reciprocating compressor is running with an actual discharge lower than the theoretica discharge
temperature. What could this indicate - ANSWER-Liquid in the suction vapor
Under what conditions will a pressure reading NOT indicate the temperature of a refrigerant? -
ANSWER-When the refrigerant is subcooled or superheated
What does the Expansion device do? - ANSWER-Controls liquid refrigerant flow to the evaporator
What does the condenser do? - ANSWER-Rejects heat from the system
How does a hermetic compressor differ from an open drive type compressor - ANSWER-Both the
motor and Compressor are in a sealed case on a hermetic compressor.
How does a centrifugal compressor work? - ANSWER-Like a fan, converting velocity into pressure
Why can the screw compressor be applied to refrigeration duty at compression ratios as high as 20:1
- ANSWER-Large quantities of oil are pumped through them for sealing and cooling.
Rising suction pressure indicates - ANSWER-A temperature rise in the evaporator and more
compressor capacity in horsepower is needed
what is the reason for log sheet entries? - ANSWER-The log sheet is used to communicate problems
and conditions from one shift to the next
The operator would be concerned about liquid slugging if they observed - ANSWER-rapid discharge
temperatue drop
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