Heat Transfer Questions

Q.  In heat exchangers, degree of approach is defined as the difference between temperatures of________________?

a. cold water inlet and outlet
b. hot medium inlet and outlet
c. hot medium outlet and cold water inlet
d. hot medium outlet and cold water outlet
e. none of the above


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No explanation is available for this question!
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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MCQs:  The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as_________________?
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MCQs:  Depending on the radiating properties, a body will be white when_________________?
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