125) Refrigeration in aeroplanes usually employs the following refrigerant

Answer is:

Air

Heat transfer MCQ with Answers

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126) Domestic refrigerator working on vapour compression cycle uses the following type of expansion device

Answer is:

capillary tube

127) Air refrigeration operates on

Answer is:

Brayton cycle.

128) Air refrigeration cycle is used in

Answer is:

gas liquefaction

Explanation:

Gas liquefaction is physical conversion of a gas into a liquid state (condensation). The liquefaction of gases is a complicated process that uses various compressions and expansions to achieve high pressures and very low temperatures. Air refrigeration cycle is used in gas liquefaction process.