This set of Refrigeration Multiple Choice Questions & Answers (MCQs) focuses on “Air Refrigerator Working on Bell-Coleman Cycle”.
1. Bell-Coleman cycle is also known as _____________
a) Carnot cycle
b) Reversed Brayton or Joule’s cycle
c) Rankine cycle
d) Otto cycle
Explanation: Bell-Coleman cycle was developed by Bell-Coleman and Light Foot by reversing the Joule’s air cycle and hence is also known as reversed Brayton or Joule’s cycle. It was one of the easiest types of refrigerators used in ships for carrying frozen meat.
2. For a refrigerating system that works on Bell-Coleman cycle, which one of the following is not a process of the cycle in p-v diagram?
a) Isentropic compression process
b) Constant pressure cooling process
c) Isothermal expansion process
d) Constant pressure expansion process
Explanation: The Bell-Coleman cycle has 4 processes namely isentropic compression process, constant pressure cooling process, isentropic expansion process and constant pressure expansion process.
3. In transport aviation, the air conditioning systems are based on ______ cycle.
a) Reversed Carnot cycle
b) Reversed Brayton cycle
c) Reversed Joule’s cycle
d) Otto cycle
Explanation: It is because in vapor-cycle the disadvantage was that due to the leakage loss of fluid it would cause the aircraft to be completely without cooling.
4. Dense air Bell-Coleman refrigerator is preferred than open cycle air refrigerator.
Explanation: In open cycle air refrigerator the main drawback is the freezing of the moisture in the air during expansion stroke which is liable to choke up the valves. Hence dense air refrigerator is preferred.
5. Which one of the following is not a true disadvantage of the Bell-Coleman cycle?
a) High running cost
b) Low COP
c) The danger of frosting at the expander valve is more
d) The size of the system is small
Explanation: Mass of air required per ton of refrigeration is large as compared to other systems of refrigeration. Hence the size of the system is large.
6. Which one of the following is not a true advantage of the Bell-Coleman cycle?
a) Air is used a refrigerant which is easily available
b) It is safe as air is non-inflammable
c) Air is nontoxic, non-corrosive and stable
d) Weight of air refrigeration equipment per ton of refrigeration is much more in aircraft than other refrigeration systems
Explanation: Weight of air refrigeration equipment per ton of refrigeration is much less in aircraft than other refrigeration systems. Hence it is light. It is because of air compressor is already available in the air-craft.
7. The Bell-Coleman refrigeration cycle uses _____ as refrigerant.
Explanation: The Bell-Coleman refrigeration cycle uses air as refrigerant, as it is easily available, non-inflammable, non-toxic, stable and inert.
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