refrigeration Flashcards
got 3 wrong on this one
How does refrigeration cool an area or a substance to below ambient temperature?
By imitating the natural cycle of heat transfer
By reversing the natural cycle of heat transfer
answer B
Which of the following types of refrigeration systems is more widely in production facilities than absorption systems?
dry ice
mechanical
adsorption
answer B
Which part of the refrigeration equipment provides the “cooling” to remove heat from a process stream?
evaporator
generator
condenser
answer A
The closed loop in a mechanical refrigeration system is referred to as the ________.
cooling circuit
Refrigeration system
answer B
What term refers to the heat that is added to boil the refrigerant to change it from a liquid phase to a vapor phase?
latent heat
hypodermic heat
answer A
What is a desired thermodynamic property of an ideal refrigerant?
a low critical temperature
a high heat of of vaporization
answer B
If the suction pressure of the compressor is lowered, the refrigerant in the evaporator will boil at a higher temperature.
true
false
answer false
if the discharge pressure of the compressor is lowered, the refrigerant in the condenser will condense at a higher temperature.
true
false
answer false
In a typical refrigerator, a thermostat controls the cooling process by monitoring the temperature. If the sensor registers too much heat in the refrigerator, what does the thermostat do?
Switches off the compressor
Switches the compressor on and begins the cooling process again
answer B
Which component of a mechanical refrigeration system is not used in an absorption refrigeration system?
An absorption system does not use a compressor.
An absorption system does not use a condenser evaporator.
answer A
Unlike mechanical systems, absorption systems use a ________ to capture refrigerants and facilitate heat removal from them.
charcoal filter
solvent
answer B
What can result from insufficient cooling?
over pressurization due to overheating
liquid flow to the compressor
answer A
What may affect performance in an air cooled condenser?
non condensable gases
flow indication malfunction
Dirty fins
answer C
What must be identified and addressed as quickly as possible to reduce environmental issues or process safety hazards?
insufficient cooling
any leak in the system
answer A
In working with refrigeration systems, what is usually a high-risk activity affecting highly valued assets that can affect a manufacturing facility for an extended duration of time if damaged?
Shutting down the system or components
Switching equipment and making lineups
Starting up the refrigeration system
answer C
Before startup of the refrigeration system, process technicians use ________.
insulated gloves
pre start up checklist
answer B
In the course of monitoring condensing temperature compared with refrigerant condensing curve anomalies, what could a significant deviation indicate?
The need to purge inert materials from the system
The need to evacuate the facility
Answer A
What can be a safety concern on the cold side of a refrigeration system?
Lack of anti freeze
frostbite
answer B
What is the main environmental issue for refrigeration systems?
leakage of refrigerant
chemical burns
answer A
