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_____________ equation relates the thermal conductivity of a solid to its temperature ?
Related MCQs
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__________?
For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are__________?
1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is__________?
Dropwise condensation occurs on __________ surfaces?
Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is__________?
The type of liquor circulation system to be ‘ employed in evaporators (viz. natural or forced circulation) is determined mainly by the __________ of the liquid?
For a given ambient air temperature with increase in the thickness of insulation of a hot cylindrical pipe, the rate of heat loss from the surface would ?
In a backward feed multiple effect evaporator __________ ?
The sum of reflectivity and absorptivity for an opaque body is equal to__________?
Steam is routed through the tube in case of a __________ evaporator?
Multiple effect evaporation is generally recommended, when the__________?
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C?
A __________ surface has the maximum thermal emissivity out of the following ?
A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case ?
Which of the following has the highest thermal conductivity ?
Circulation pump is located below the evaporator to__________?
Economy of an evaporator is influenced by the__________?
‘Fouling factor’ used in the design of a multipass shell and tube heat exchanger is a__________?
At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the__________?
Film boiling occurs at __________ pressure?
Choose the most important factor on which the heat conducted through a wall in a unit time will depend on ?
Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is__________?
Double pipe heat exchangers are preferably useful, when__________?
With increase in the distance between the heat source and the object receiving the heat, the radiation heat transfer ?
For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally ?
For a counter current heat exchanger with Ti h = 80°C, T°c = 60°C, T°h = 50°C and Ti c = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy__________?
Heat flux through several resistances in series in analogous to the current flowing through several__________?
At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical ?
Heat transfer by natural convection is enhanced in system with__________?
Reynold’s analogy states that (where, St = Stanton number f = friction factor) ?
A dephlegmator is a__________?
Film boiling is usually not desired in commercial equipments, because__________?
The advantage of backward feed multiple effect evaporators over forward feed units is that__________?
In case of a multipass shell and tube heat exchanger, providing a baffle on the shell side __________ the heat transfer rate?
With the increase of temperature, the Col-burn jH factor__________?
Electromagnetic radiations propagate in vacuum with a velocity of __________ metre/second?
In a heat exchanger, floating head is provided to__________?
Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid ?
The equivalent diameter for pressure drop is __________ that for heat transfer?
As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient ?
Fouling factor__________?
If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid__________?
The unit of heat transfer co-efficient in SI unit is__________?
Which type of heat exchanger is preferred for heavy heat loads ?
With increase in porosity, the thermal conductivity of a solid substance__________?
Vacuum is generally maintained in the vapour space of an evaporator mainly to__________?
The number of kg vaporised per kg of steam fed to the evaporator is defined as__________?
Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone?
_____________ equation relates the thermal conductivity of a solid to its temperature ?
A. Antoine
B. Kopp’s
C. Lee’s
D. Kistyakowsky
Correct Answer:
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Last Updated:
March 03, 2019