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This is an MCQ-based quiz on the topic of Heat Transfer by Conduction, Convection and Radiation.
This includes the following:-
Steady state heat transfer
Unsteady state heat transfer
Kirchhoff’s law of conduction
Fourier’s law conduction
Nusselt’s film theory
Which of the following is true about Natural Convection?
__________ is when nucleate boiling transforms to film boiling.
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.
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.
Statement 1: NPr= (Cp μ)/k Statement 2: If NPr is lesser than 1, Thermal Boundary layer is thinner than Hydrodynamic Boundary layer.
Why is better to use a Jacketed vessel in the dairy industry than a stainless steel container directly?
Statement 1: hd/k is _____ Statement 2: _____ is the ratio of convective heat transfer to conductive heat transfer.
The reciprocal of heat transfer co-efficient is _____
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
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.
According to Nusselt’s film theory, the film thickness decreases as we move from bottom to top. The heat transfer increases.
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.
Find heat transfer in an agitated jacketed vessel if NRei is 1.5 * 105 and NPr is 20.
Which of the following is NOT a real dimensionless number?
Statement 1: Sieder-Tate and Dittus-boelter equations imply only to laminar flow conditions. Statement 2: Under laminar conditions, the same equation applies both to Newtonian and Non-Newtonian fluids.
