EXAMIANS
According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to
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Fourier'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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Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)
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Thermal conductivity of water _________ with rise in temperature.
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Which of the following property of air does not increase with rise in temperature?
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The rate of energy transferred by convection to that by conduction is called
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An ordinary passenger aircraft requires a cooling system of capacity.
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If 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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The rate of heat flow through a body is Q = [kA (T₁ - T₂)]/x. The term x/kA is known as
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Which of the following would lead to a reduction in thermal resistance?
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