Q. Statement 1: When the average radius gives an error, log mean radius is used.
Statement 2: Log mean radius is given by rL= ( r₀– rᵢ )/(ln(r₀/rᵢ))

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Q. Statement 1: α=k/(ρCₚ)
Statement 2: α stands for thermal conductivity.

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Q. Statement 1: NFo stands for Fourier number.
Statement 2: NFo= (αtₜ)/s²

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Q. NFo= (αtₜ)/s². Here ‘s’ stands for half slab thickness. Based on this data, ‘s’ for a chapatti/ dosa will be _____

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Q. _____ is the equation for unsteady state heat conduction through solid materials.

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Q. For a copper pipe, k = 0.3534, temperature difference = 60, B = 0.0125 and A = 850. What is the value of q?

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Q. Which of the following is true about Natural Convection?

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Q. __________ is when nucleate boiling transforms to film boiling.

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Q. Statement 1: Nucleate Boiling is when a layer of film is formed in the beginning.
Statement 2: Boiling starts with the bottom layer which heats up, becomes light and goes up. That way everything becomes hot and there is not temperature difference and hence no heat transfer.

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Q. Statement 1: When heat transfer takes between a solid surface and a fluid, an insulating film layer is formed. More is the agitation; more is the thickness of the film.
Statement 2: Within the film, the temperature varies from the wall to the temperature of the bulk.

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Q. Statement 1: Nₚᵣ= (Cₚμ)/k
Statement 2: If Nₚᵣ is lesser than 1, Thermal Boundary layer is thinner than Hydrodynamic Boundary layer.

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Q. Why is better to use a Jacketed vessel in the dairy industry than a stainless steel container directly?

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Q. Statement 1: hd/k is _____
Statement 2: _____ is the ratio of convective heat transfer to conductive heat transfer.

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Q. The reciprocal of heat transfer co-efficient is _____

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Q. Statement 1: Film-type condensation has a higher heat transfer co-efficient than drop-wise condensation.
Statement 2: Drop-wise condensation is easier to maintain than Film-type condensation

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Q. Statement 1: Drop-wise condensation takes place on a smooth surface.
Statement 2: All the resistance to heat transfer lies in the film formed during Film-type condensation.

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Q. According to Nusselt’s film theory, the film thickness decreases as we move from bottom to top. The heat transfer increases.

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Q. Statement 1: Unsteady state heat transfer equation can be used when there is negligible internal resistance.
Statement 2: Unsteady state heat transfer equation can be used for liquid food items which are well stirred, because, temperature gradient within won’t be there.

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Q. Statement 1: In nusselt’s film theory, velocity of the falling film is not affected by the velocity of the vapors.
Statement 2: LMTD can be used provided the overall heat transfer co-efficient is constant over a large range of temperatures.

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Q. Find heat transfer in an agitated jacketed vessel if Nᵣₑᵢ is 1.5 * 105 and Nₚᵣ is 20.

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