156) A one tonne refrigerating machine means that

one tonne is the total mass of machine

one tonne refrigerant is used

one tonne of water can be converted into ice

one tonne of ice when melts from and at 0 Degree Centigrade in 24 hours, the refrigeration effect is equivalent to 210 kJ/min

Answer is:

one tonne of ice when melts from and at 0 Degree Centigrade in 24 hours, the refrigeration effect is equivalent to 210 kJ/min

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

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Related Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

157) The air cooling system mostly used in transport type aircrafts is

simple air cooling system

simple evaporative air cooling system

boot-strap air cooling system

all of these

Answer is:

boot-strap air cooling system

158) The critical thickness of insulation is the ratio of thermal conductivity of the insulating material (k) to the heat transfer coefficient at the outer surface of the insulation (h₀).

Right

Wrong

Answer is:

Right

159) In counter-current flow heat exchanger, the logarithmic temperature difference between the fluids is __________ as compared to parallel flow heat exchanger.

same

less

greater

none of these

Answer is:

greater

160) Environmental protection agencies advice against the use of chloro-fluoro-carbon refrigerants since

these react with water vapour and cause acid rain

these react with plants and cause green-house effect

these react with oxygen and cause its depletion

these react with ozone layer

Answer is:

these react with ozone layer

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

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156) A one tonne refrigerating machine means that

one tonne of ice when melts from and at 0 Degree Centigrade in 24 hours, the refrigeration effect is equivalent to 210 kJ/min

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

Related Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

157) The air cooling system mostly used in transport type aircrafts is

boot-strap air cooling system

158) The critical thickness of insulation is the ratio of thermal conductivity of the insulating material (k) to the heat transfer coefficient at the outer surface of the insulation (h0).

Right

159) In counter-current flow heat exchanger, the logarithmic temperature difference between the fluids is __________ as compared to parallel flow heat exchanger.

greater

160) Environmental protection agencies advice against the use of chloro-fluoro-carbon refrigerants since

these react with ozone layer

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

158) The critical thickness of insulation is the ratio of thermal conductivity of the insulating material (k) to the heat transfer coefficient at the outer surface of the insulation (h₀).