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.Management Sciences
Category: Chemical Heat Transfer
The heat transfer co-efficient in film type condensation is _______________ that for dropwise condensation?
A. Greater than
B. Lower than
C. Is same as
D. Half
In a boiling curve, the peak heat flux is called the _____________ point?
A. Nusselt
B. Leidenfrost
C. Boiling
D. Burnout
Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the_________________?
A. Existence of thermal boundary layer
B. Temperature gradient produced due to density difference
C. Buoyancy of the bubbles produced at active nucleation site
D. None of these
A hot body will radiate heat most rapidly, if its surface is___________________?
A. White & rough
B. Black & rough
C. White & polished
D. Black & polished
Economy of an evaporator is influenced by the_____________________?
A. Steam pressure
B. Feed temperature
C. Number of effect
D. Both B. & C.
In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is _____________ the outlet temperature of the cold fluid?
A. Equal to
B. More than
C. Less than
D. Either more or less than (depending upon the fluid)
Pick out the wrong statement?
A. The capacity of an evaporator is reduced by the boiling point elevation
B. Corrosive liquid is normally passed through the tubes in a shell and tube heat exchanger
C. Steam jet ejector is used for vapor compression in a thermal recompression evaporator
D. Heat sensitive materials should be concentrated in high pressure evaporators
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