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Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.) ?
Related MCQs
Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the__________?
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jH factor for heat transfer is not a function of the __________ number?
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Baffle spacing __________?
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The purpose of floating head in a heat exchanger is to__________?
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Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?
For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then__________?
Heat transfer in the laminar sub-layer in case of a liquid flowing through a pipe, is mostly by__________?
__________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side?
Evaporation of 1kg of water from a solution in a single effect evaporator requires about __________ kg of steam?
Thermal conductivities of most of the liquids __________ with rise in temperature?
The purpose of providing a ‘catchall’ in the vapor line of an evaporator is to__________?
Removal of __________ heat is involved in the condensation of a vapor under saturated conditions?
The energy radiated from a surface Q at absolute temperature T is related as__________?
Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ?
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Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low__________?
__________ paint has the maximum absorption coefficient ?
Baffles are provided in heat exchangers to increase the__________?
Prandtl and Reynold’s analogies are identical for Prandtl number value of__________?
The rate of heat transfer through a pipe wall is given by, q = 2π k (Ti – T0)/ln (ri/r0). For cylinder of very thin wall, q can be approximated by__________?
If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will __________?
A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the __________ number?
Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by__________?
Which is the most suitable for the concert-ration of highly concentrated solution ?
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A hot body will radiate heat most rapidly, if its surface is__________?
Prandtl number is the ratio of__________?
Rate of heat transfer by vaporisation from pools of water is affected by the __________?
The purpose of providing bleed points in the evaporator is to__________?
With increase in temperature, the thermal conductivity of steel__________?
In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is__________?
Which of the following is the most controlling factor for the rate of bubble detachment from the hot solid surface ?
Radiation heat transfer rates does not depend upon the__________?
If all the conditions and dimensions are same, then the ratio of velocity through the tubes of a double pass heat exchanger to that through the single pass heat exchanger is__________?
Which of the following is not concerned with the heat transfer ?
__________ equation relates the thermal conductivity of a solid to its temperature ?
Unsteady state heat conduction occurs, when__________?
For specified tube outside diameter, higher BWG means higher__________?
A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time __________?
Value of Prandtl number for water ranges from__________?
Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.) ?
A. √d
B. d
C. d2
D. d1.5
Correct Answer:
d
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Last Updated:
March 03, 2019