Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

266) The central air conditioning system has __________ overall efficiency as compared to individual systems.

Answer is:

higher

267) The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Answer is:

Kirchhoff's law

Explanation:

According to Kirchhoff's law, the ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body.

268) An ordinary passenger aircraft requires a cooling system of capacity.

Answer is:

8 TR

269) In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is

Answer is:

reversed Brayton cycle

270) The thermal diffusivity for solids is generally less than those for liquids and gases.

Answer is:

266) The central air conditioning system has __________ overall efficiency as compared to individual systems.

higher

267) The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Kirchhoff's law

268) An ordinary passenger aircraft requires a cooling system of capacity.

8 TR

269) In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is

reversed Brayton cycle

270) The thermal diffusivity for solids is generally less than those for liquids and gases.

Wrong