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Heat Transfer

Heat Transfer
Value of Nusselt number [Nu = (hD/k)] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is

10
100
0.5
2

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Heat Transfer
Which is the most suitable for cold viscous feed?

Parallel feed
Mixed feed
Forward feed
Backward feed

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Heat Transfer
Overall heat transfer co-efficient for cooling of hydrocarbons by water is about

50 -100 W/m² . °K
50 -100 BTU/hr. ft.2°F
50 -100 Kcal/hr.m².°C
1000 - 1500 BTU/hr. ft.2°F

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Heat Transfer
Thermal diffusivity of a material

Is the ratio of thermal conductivity to thermal capacity
Is defined as K/ρ . Cp
All of these
Has the unit m² /sec

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Heat Transfer
Tubes are held between top and bottom tube sheets in Calenderia type evaporator by keeping

The top tube sheet floating and bottom tube sheet fixed
Both the tube sheets floating
The top tube sheet fixed and the bottom tube-sheet floating
Both the tube sheets fixed

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Heat Transfer
A 2-4 heat exchanger involves

Smaller pressure drop compared to 1-2 exchanger
Only parallel-flow of fluids
Only counter-flow of fluids
Both counter and parallel-flow of the fluids

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MORE MCQ ON Heat Transfer

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