Chemical Engineering Mcqs

Submitted By: Ali Uppal

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  • Two balls of same material and finish have their diameters in the ratio of 2 : 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of____________________?
  • Heat conducted througfi unit area and unit thick face per unit time when temperature difference between opposite faces is unity,is called__________________?
  • A grey body is one whose absorptivity_________________?
  • The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as ________________?
  • In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by___________________?

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