Mechanical Engineering :: Heat and Mass Transfer
- According of Kirchhoff's law
- The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as
- Which of the following is the case of heat transfer by radiation?
- The ratio of the energy absorbed by the body to total energy falling on it is called
- Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)
- LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is
- The automobile radiator is a heat exchanger of
- A grey body is one whose absorptivity
- In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the
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A.
Radiant heat is proportional to fourth power of absolute temperature |
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B.
Emissive power depends on temperature |
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C.
Emissive power and absorptivity are constant for all bodies |
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D.
Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body |
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