Q141
Open questionWhich of the following is a case of steady state heat transfer?
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Mechanical Engineering · all questionsHeat And Mass Transfer
Heat And Mass Transfer
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Q142
Open questionRadiation is the process of heat transfer in which heat flows from a ________, in a straight line, without affecting the intervening medium.
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Q143
Open questionFourier's law of heat conduction gives the heat flow for
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Q144
Open questionIn a shell and tube heat exchanger, baffles are provided on the shell side to
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Q145
Open questionA designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is
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Q146
Open questionIf the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ and λ + dλ is represented by (eλ.dλ), then eλ is called
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Q147
Open questionThe process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as
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Q148
Open questionThe process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called
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Q149
Open questionFourier's law of heat conduction is valid for
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Q150
Open questionAccording to Newton's law of cooling, the heat transfer from a hot body to a cold body is
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Q151
Open questionAbsorptivity of a body will be equal to its emissivity
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Q152
Open questionIn a heat exchanger with one fluid evaporating or condensing, the surface area required is least in
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Q153
Open questionA steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,
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Q154
Open questionThe ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to
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Q155
Open questionThe product of Reynolds number and Prandtl number is known as
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Q156
Open questionUpto the critical radius of insulation,
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Q157
Open questionFourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow and k = Thermal conductivity of the body)
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Q158
Open questionIn counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.
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Q159
Open questionIn counter flow heat exchangers
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Q160
Open questionThe energy distribution of an ideal reflector at higher temperatures is largely in the range of
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