Heat Transfer Questions

Q.  Heat transfer in liquid and gases takes place by_____________________?

a. conduction
b. convection
c. radiation
d. conduction and convection
e. convection and radiation


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MCQs:  Which of the following has least value of conductivity_________________?
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MCQs:  Heat flows from one body to other when they have_________________?
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MCQs:  The amount of heat flow through a body by conduction is_______________?
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MCQs:  Which of the following has maximum value of thermal conductivity________________?
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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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