Heat Transfer Questions

Q.  Thermal conductivity of water in general with rise in temperature ____________________?

a. increases
b. decreases
c. remains constant
d. may increase or decrease depending on temperature
e. none of the above


ANSWER: See Answer
 
No explanation is available for this question!
MCQs:  Heat transfer by radiation mainly depends upon___________________?
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MCQs:  Moisture would find its way into insulation by vapour pressure unless it is prevented by __________________ ?
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MCQs:  Thermal diffusivity is ____________________?
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MCQs:  Thermal conductivity of wood depends on_______________?
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MCQs:  Film coefficient is defined as Inside diameter of tube________________?
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MCQs:  Unit of thermal diffusivity is_________________?
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MCQs:  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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MCQs:  The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as ________________?
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MCQs:  A grey body is one whose absorptivity_________________?
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MCQs:  Heat conducted througfi unit area and unit thick face per unit time when temperature difference between opposite faces is unity,is called__________________?
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MCQs:  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____________________?
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MCQs:  Emissivity of a white polished body in comparison to a black body is________________?
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MCQs:  A non-dimensional number generally associated with natural convection heat transfer is________________?
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MCQs:  In heat exchangers, degree of approach is defined as the difference between temperatures of________________?
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MCQs:  A steam pipe is to be insulated by two insulating materials put over each other . For best results__________________?
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MCQs:  According of Kirchhoff’s law______________________?
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MCQs:  LMTD in case of counter flow heat exchanger as compared-to parallel flow heat exchanger is _________________?
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MCQs:  Fourier’s law of heat conduction is valid for_________________?
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MCQs:  In counter flow heat exchangers_________________?
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MCQs:  The concept of overall coefficient of heat transfer is used in case of heat transfer by________________?
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