This set of Refrigeration Multiple Choice Questions & Answers (MCQs) focuses on “Classification of Refrigerants”.
1. Which of the following is not the type of refrigerant?
a) Organic refrigerants
b) Inorganic refrigerants
c) Azeotrope refrigerants
d) Halo-helium refrigerants
View Answer
Explanation: Primary refrigerants are classified as Organic, i.e., Halo-Carbon refrigerants, Inorganic refrigerants, Azeotrope refrigerants, and Hydro-carbon refrigerants. Primary refrigerants are the one which takes a direct part in the refrigeration system.
2. When refrigerants take a direct part in the refrigeration system, then these types of refrigerants are called?
a) Primary
b) Secondary
c) Tertiary
d) Mixed
View Answer
Explanation: Primary refrigerants are the one which takes a direct part in the refrigeration system. By absorbing the latent heat of vaporization effective refrigeration in produced.
3. The refrigerants which are first cooled by _________ refrigerants and then used for cooling purposes are known as ___________ refrigerants.
a) secondary, primary
b) primary, secondary
c) tertiary, primary
d) secondary, tertiary
View Answer
Explanation: Primary refrigerants are the one which takes a direct part in the refrigeration system. By absorbing the latent heat of vaporization effective refrigeration in produced. Whereas, refrigerants used for cooling purpose but firstly cooled by primary refrigerants are secondary refrigerants.
4. What is the number of halo-carbon compound refrigerants present as per ASHRAE?
a) 40
b) 41
c) 42
d) 43
View Answer
Explanation: As per ASHRAE, i.e., American Society of Heating, Refrigeration and Air-conditioning Engineers, 42 Halo-carbon compounds are identified, but only a few are commonly used.
5. What does azeotrope mean?
a) Type of molecule
b) Type of bond
c) Stable mixture
d) Unstable mixture
View Answer
Explanation: Azeotrope means a stable mixture of refrigerants; whose phases retain identical compositions over a large range of temperatures.
6. Which one of the following inorganic refrigerants is often used?
a) NH3
b) CO2
c) H2O
d) SO2
View Answer
Explanation: Ammonia, i.e., NH3, is widely used for the refrigeration system. Though it possesses high toxicity due to desirable properties to achieve maximum refrigeration effect is present, it is used frequently.
7. What is the refrigerant number of water?
a) R – 717
b) R – 744
c) R – 118
d) R – 100
View Answer
Explanation: Water is having refrigerant number as R-118. Whereas, R-717, 744, 100 corresponds to Ammonia, Carbon dioxide, and ethyl chloride.
8. What is the number of halo-carbon compound refrigerants commonly used as per ASHRAE?
a) 42
b) 14
c) 41
d) 15
View Answer
Explanation: As per ASHRAE, i.e., American Society of Heating, Refrigeration, and Air-conditioning Engineers, 42 Halo-carbon compounds are identified, but only a few are commonly used. The number of commonly used refrigerants is 14. Ex. R-11, 12, 13, 14, 21, 22, 30, 40, 100, 113, 114, 115, 123, 124, 134a, 152a.
9. Which of the following refrigerants are in the Freon group?
a) Organic refrigerants
b) Inorganic refrigerants
c) Azeotrope refrigerants
d) Hydrocarbon refrigerants
View Answer
Explanation: Freon group is in the Organic or halo-carbon type of refrigerants. Halo-carbon compounds are produced and developed by freon family of refrigerants. Freon is the trademark of E.I. Du Pont de Nemours and Co., America.
10. Hydro-carbon refrigerants are commonly used nowadays.
a) True
b) False
View Answer
Explanation: Hydro-carbons possess desired properties for refrigeration, but due to high flammability and explosive nature, hydrocarbons are replaced by another less explosive type of refrigerant.
Sanfoundry Global Education & Learning Series – Refrigeration & Air Conditioning.
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