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ME Set-3
Heat transfer
93

Heat transfer MCQ with Answers

93) A grey body is one whose absorptivity

varies with temperature

varies with the wave length of incident ray

varies with both

does not vary with temperature and wave length of the incident ray

Answer is:

does not vary with temperature and wave length of the incident ray

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.

Heat transfer MCQ with Answers

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Related Heat transfer MCQ with Answers

94) Which of the following is a case of steady state heat transfer

I.C. engine

air preheaters

heating of building in winter

none of the above.

Answer is:

none of the above.

95) Total heat is the heat required to

change vapour into liquid

change liquid into vapour

increase the temperature of a liquid or vapour

convert water into steam and superheat it

Answer is:

convert water into steam and superheat it

96) Pick up the wrong statement. A refrigerant should have

Tow specific heat of liquid

high boiling point

high latent heat of vaporisation

higher critical temperature

Answer is:

high boiling point

97) A standard ice point temperature corresponds to the temperature of

water at 0°C

ice at - 4°C

solid and dry ice

mixture of ice and water Under equilibrium conditions.

Answer is:

mixture of ice and water Under equilibrium conditions.

Heat transfer MCQ with Answers

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