AUXMACH 2 FINAL EXAM REVIEW
4. R22 is a type of refrigerant that was completely phased out in 2020 . This type refrigerant belongs to which group of refrigerants?
7. If a refrigeration compressor is running continuously without lowering the temperature in the refrigerated space, the trouble may be?
It is a refrigerant that has been used since the 1840's and considered to be a high-class refrigerant as its Ozone Depleting Properties and Global Warming Potential are Zero but was withdrawn from applications as it was considered to be hazardous?
What activates if pressure reaches the cut-out setting thereby opening the electrical circuit automatically and closes it again when it reaches cut-in setting?
12. The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such process is called?
Area at which the temperature is lower than the saturation temperature for the pressure range in question.
What part of the refrigerating system that ensures compressor lubricating oil is fed back directly to the crankcase and prevents oil circulating with the refrigerant?
It is a procedure use in preventing liquid refrigerant from migrating back to the compressor when the systems is in an off cycle mode.
34. Condensing temperature in a refrigerator is the temperature at which refrigerant becomes _____________?
The condition of refrigerant is high pressure saturated liquid before entering the _________________
It changes the state of refrigerant from being a superheated vapor to saturated and then to a subcooled liquid
It is an environmental effect a refrigerant have when it forms an explosive mixture when the concentration in air is between 16% to 25%
41. The current Refrigerants in Marine use such as R404A, R410a and R134a belongs to which group of Refrigerants?
46. This is a type of refrigerant which is non-flammable, does not cause ozone depletion and very low toxicity index and available in large quantities at a low cost but has a low efficiency and high operating pressure.
It is a group of refrigerants which are harmless to the Ozone Layer and does not have any direct greenhouse effect but are highly flammable?
It is the most important chemical properties of refrigerants. The refrigerant should be non-poisonous to humans and food stuff.
It is a part of the refrigerating system that prevents liquid refrigerant from flowing into the suction line and into the compressor.
It is a part of the refrigerating system that acts as a storage for liquid refrigerant and ensures only liquid refrigerant is entering the expansion device
It is a Group of Refrigerants which does not contain chlorine but still damage the environment because they are greenhouse gases
A disposing procedure that is use when a partial or complete refrigerant is removed from the system and later re-injected; or when the system is converted to run with a new refrigerant or when the equipment is dispose of
It is a chemical property of refrigerants which must not have any reaction to materials used in Refrigeration Cycle
A Group of Refrigerants which is known to contribute to the greenhouse gas effect. The production of these ceased in 1994.
It is the sum of the internal energy and the product of the pressure and volume of a thermodynamic system
It is a part of the refrigerating system that maintains the internal cleanliness that traps impurities such as dirt, water or moisture
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