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.Management Sciences
Category: Chemical Heat Transfer
The unit of heat transfer co-efficient is_________________?
0
A. BTU/hr. ft2°F
B. BTU/hr. °F. ft
C. BTU/hr. °F
D. BTU/hr. ft
jH factor for heat transfer depends upon the ____________ number?
A. Biot
B. Nusselt
C. Reynolds
D. Prandtl
For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally ?
A. Decreases
B. Increases
C. Remains unchanged
D. Increases exponentially
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 ________________?
A. More
B. Less
C. Same
D. More or less; depends on the nature of solution
The equivalent diameter for pressure drop is ________________ that for heat transfer?
A. Smaller than
B. Greater than
C. Equal to
D. Not related with
The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are_______________?
A. Re.Gz
B. Nu, Pr
C. Nu, Pr, Re
D. Nu, Gz
The thermal boundary layer at NPr > 1 ?
A. Is thicker than hydrodynamic boundary layer
B. Is thinner than hydrodynamic boundary layer
C. And the hydrodynamic boundary layers are identical
D. Disappears
In case of _______________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface?
A. Nucleate
B. Local
C. Pool
D. Saturated
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