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Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)?
Related MCQs
Tube expansion allowances exist in __________ heat exchanger?
Multiple effect evaporation accounts for__________?
A black body does not __________ radiation?
An equipment which converts the latent or sensible heat of one fluid into the latent heat of vaporisation of another, is called a__________?
Fresh orange juice contains 12% (by weight) solids and the rest water 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is__________?
Sensible heat absorbed by 1 lb of water when it is heated from 32 to 212°F may be around __________ BTU?
Stefan’s block body radiation law can also be derived from __________ law?
What is the geometric mean of two heat transfer areas A1 and A2 ?
The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is __________?
Which has the lowest Prandtl number ?
In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is__________?
Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because__________?
‘Duhring’s plot’ is of use in__________?
View factor is important in heat transfer by__________?
Forced circulation evaporators are normally used for concentrating liquids having __________?
The equation, Nst = f/2, is the __________ analogy?
Which of the following is directly concerned with the heat transfer ?
The thermal boundary layer at NPr > 1 ?
Nucleate boiling is promoted __________?
At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe ?
The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m2.K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m2.K. The overall heat transfer co-efficient at this time is __________?
Cpμ/K is termed as the __________ number?
In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator?
In case of a super-cooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is __________?
Maximum heat transfer rate is obtained in __________ flow?
Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow.) ?
In a shell and tube heat exchanger, floating head is used for __________?
Dittus-Boelter equation used for the determination of heat transfer co-efficient is valid __________?
With increase in temperature, the total emissivity of conductors__________?
A multiple effect evaporator as compared to a single effect evaporator of the same capacity has __________?
Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling ?
“The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium”. This is __________ law?
In a forward feed multiple effect evaporator, the pressure is __________?
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__________?
The non-dimensional temperature gradient in a liquid at the wall of a pipe is the __________?
The film co-efficient between condensing vapour and metal wall increases with __________?
With increase in temperature, the thermal conductivity of most liquids__________?
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 ?
The driving potential for the crystal growth during crystallisation is the __________ of the solution?
Heat flux, as defined in heat flow is analogous to __________ in electricity flow?
Conductance is given by (where, x = thickness, A = heat flow area, K = thermal conductivity.)?
LMTD can’t be used as such without a correction factor for the__________?
Heat sensitive materials can be concentrated in an evaporator employing__________?
For what value of Prandtl number, St = f/2 ?
In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid__________?
Grashoff number is given by__________?
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ law?
Which of the following is the most widely used heat insulating material for pipelines carrying steam ?
Evaporator tubes are generally__________?
In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is __________ the outlet temperature of the cold fluid?
Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer?
Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)?
A. 0.2 D
B. 0.5 D
C. 0.66 D
D. 0.80 D
Correct Answer:
0.2 D
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Last Updated:
March 03, 2019