This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Absorption Refrigeration Cycle”.
1. In absorption refrigeration cycle, which of the following is used?
a) refrigerant
b) absorbent
c) both of the mentioned
d) none of the mentioned
View Answer
Explanation: Both refrigerant and absorbent are used in absorption refrigeration cycle.
2. In absorption system, compressor in vapour compression cycle is replaced by absorber-generator assembly.
a) true
b) false
View Answer
Explanation: The absorber-generator assembly involves less mechanical work.
3. In the aqua-ammonia absorption system,
a) water is the refrigerant and ammonia is the absorbent
b) ammonia is the refrigerant and water is the absorbent
c) both ammonia and water can be used as refrigerant or absorbent
d) none of the mentioned
View Answer
Explanation: This is the basic absorption refrigeration cycle.
4. Which of the following statement is true?
a) ammonia vapour is absorbed in water
b) boiling point of ammonia is more than that of water
c) both of the mentioned
d) none of the mentioned
View Answer
Explanation: The boiling point of ammonia is less than that of water.
5. why is an analyser-rectifier combination is used in absorption refrigeration cycle?
a) to increase the amount of water vapour in ammonia vapour
b) to decrease the amount of water vapour in ammonia vapour
c) to eliminate the water vapour from ammonia vapour
d) all of the mentioned
View Answer
Explanation: This is done to prevent the blocking of expansion valve because of frozen ice.
6. Which of the following condenses first?
a) ammonia vapour
b) water vapour
c) both condense at same temperature
d) none of the mentioned
View Answer
Explanation: The saturation temperature of water is higher than ammonia at any given pressure.
7. The vapour going to condenser is ____ in temperature and ____ in ammonia.
a) higher, less
b) higher, richer
c) lower, less
d) lower, richer
View Answer
Explanation: When passing through analyser, the vapour is cooled and enriched by ammonia.
8. Lithium bromide-water vapour is another absorption refrigeration system.
a) true
b) false
View Answer
Explanation: In this, water is the refrigerant and solution of lithium bromide in water is the absorbent.
9. Water is used as a ____ in air conditioning units.
a) absorbent
b) refrigerant
c) absorbent and refrigerant
d) none of the mentioned
View Answer
Explanation: The reason is that water cannot be cooled below 0 degree Celsius.
10. The COP of absorption refrigeration system is
a) low
b) high
c) equal to that of vapour compression refrigeration system
d) none of the mentioned
View Answer
Explanation: The Cop of absorption refrigeration system is low.
Sanfoundry Global Education & Learning Series – Thermodynamics.
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