A. Concentration
B. Viscosity
C. Super-saturation
D. Density
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In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass _____________ through the heat exchanger ?
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With increase in temperature, the thermal conductivity of most liquids_________________?
A. Once
B. Twice
C. Thrice
D. Four times
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The film co-efficient between condensing vapour and metal wall increases with _____________________?
A. Increases
B. Decreases
C. Remain same
D. First increases upto a certain temperature and then becomes constant
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The non-dimensional temperature gradient in a liquid at the wall of a pipe is the ____________________?
A. Increasing temperature of the vapour
B. Decreasing temperature of the vapour
C. Increasing viscosity of the film of condensate
D. Increasing temperature drop
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For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is______________?
A. Heat flux
B. Nusselt number
C. Prandtl number
D. Schmidt number
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In a forward feed multiple effect evaporator, the pressure is ____________________?
A. Nu = 0.023 Re0.8. Pr0.4
B. Nu = (π/2) Gz
C. Nu = (2/π) Gz
D. Nu = 2Gz0.5
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“The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium”. This is ______________ law?
A. Highest in last effect
B. Lowest in last effect
C. Same in all effects
D. Dependent on the number of effects
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Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling ?
A. Kirchoff’s
B. Planck’s
C. Wien’s displacement
D. Stefan-Boltzmann
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A multiple effect evaporator as compared to a single effect evaporator of the same capacity has _________________?
A. Square pitch
B. Triangular pitch
C. Diagonal square pitch
D. None of these
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