265) The relative humidity __________ as air gets drier.

increases

decreases

remains same

none of these

Answer is:

increases

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

same

lower

higher

none of these

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

Wien's law

Stefan's law

Kirchhoff's law

Planck's law

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.

2 TR

4 TR

8 TR

10 TR

Answer is:

8 TR

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

reversed Carnot cycle

reversed Joule cycle

reversed Brayton cycle

reversed Otto cycle

Answer is:

reversed Brayton cycle

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