229) When the discharge pressure is too high in a refrigeration system, high pressure control is installed to stop the compressor.

Correct

Incorrect

Answer is:

Correct

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

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230) A grey body is one whose absorptivity does not vary with temperature and wave length of the incident ray.

Right

Wrong

None of these

None

Answer is:

Right

Explanation:

A grey body is defined as one whose absorptivity of a surface does not vary with temperature and wavelength of the incident radiation. In other words, if the ratio of emission of a body to that of a black body at a given temperature is constant for all wavelengths, then the body is called a grey body.