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.
230) A grey body is one whose absorptivity does not vary with temperature and wave length of the incident ray.
Answer is:
Right
Explanation:
Related Heat Transfer Refrigeration and Air Conditioning MCQ with Answers
Answer is:
increase
Answer is:
4
Explanation:
The coefficient of performance or COP (sometimes CP or COP) of a heat pump, refrigerator or air conditioning system is a ratio of useful heating or cooling provided to work required.
COP=120 kw/30kw
COP=4