247) The temperature below which a gas is always liquified, is known as critical temperature.

Answer is:

Incorrect

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248) A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in higher coefficient of performance.

Answer is:

Agree

249) The ratio of surface convection resistance to the internal conduction resistance is known as

Answer is:

Biot number

250) Kirchhoff's law states that

the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature

the wave length corresponding to the maximum energy is proportional to the absolute temperature

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

none of the above

Answer is:

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

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.

251) Dew point temperature is the temperature of air recorded by a thermometer, when the moisture present in it begins to condense.

Answer is:

Correct

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