Heat Transfer Questions

Q.  According to Kirchoff’s law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a _________________?

a. grey body
b. brilliant white polished body
c. red hot body
d. black body
e. none of the above


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MCQs:  Depending on the radiating properties, body will be transparent when________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
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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MCQs:  Depending on the radiating properties, a body will be opaque when _________________?
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MCQs:  According to Wien’s law, the wavelength corresponding to maximum energy is proportion to ________________?
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MCQs:  For starting an axial flow pump, its delivery valve should be____________________?
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MCQs:  Centrifugal pump is started with its delivery valve __________________?
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MCQs:  When a piping system is made up primarily of vertical lift and very little pipe friction, the pump characteristics should be _________________?
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MCQs:  Multistage centrifugal pumps are used to obtain___________________?
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MCQs:  In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by_______________?
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MCQs:  One horsepower is equal to_________________?
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