Heat Transfer Questions

Q.  Emissivity of a white polished body in comparison to a black body is________________?

a. higher
b. lower
c. same
d. depends upon the shape of body
e. none of the above


ANSWER: See Answer
 
No explanation is available for this question!
MCQs:  The unit of Stefan Boltzmann constant is ____________________?
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MCQs:  Stefan Boltzmann law is applicable for heat transfer by __________________?
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MCQs:  Thermal diffusivity of a substance is __________________?
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MCQs:  The thermal diffusivities for gases are generally_____________________?
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MCQs:  A grey body is one whose absorptivity _________________?
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MCQs:  Planck’s law holds good for________________?
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MCQs:  A perfect black body is one which_______________?
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MCQs:  If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of___________________?
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MCQs:  In regenerator type heat exchanger, heat transfer takes place by___________________?
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MCQs:  Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by ___________________?
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MCQs:  Depending on the radiating properties, body will be transparent when________________?
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MCQs:  Absorptivity of a body will be equal to its emissivity___________________?
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MCQs:  The amount of radiation mainly depends on___________________?
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MCQs:  The ratio of the energy absorbed by the body to total energy falling on it is called_________________?
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MCQs:  The emissive power of a body depends upon its___________________?
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MCQs:  40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is____________________?
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MCQs:  The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit_______________?
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MCQs:  Depending on the radiating properties, a body will be black when_________________?
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MCQs:  According to Stefan’s law, the total radiation from a black body per second per unit area is proportional to____________________?
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MCQs:  The thermal diffusivities for solids are generally__________________?
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