Film boiling occurs at ________________ pressure?
Film boiling occurs at ________________ pressure?
A. Atmospheric
B. Sub-atmospheric
C. Negative
D. Very high
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Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is_________________?
Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is_________________?A. 1
B. < 1
C. > 1
D. > 5Economy of a multiple effect evaporator is not influenced much by the_______________________?
Economy of a multiple effect evaporator is not influenced much by the_______________________?A. Boiling point elevations
B. Temperature of the feed
C. Rate of heat transfer
D. Ratio of the weight of the thin liquor to thick liquorColburn analogy is applicable for the value of Prandtl number from_________________?
Colburn analogy is applicable for the value of Prandtl number from_________________?A. 0.001 to 1
B. 0.6 to 120
C. 0.5 to 5
D. 120 to 400In 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 ________________?
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 solutionThe local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) _________________?
The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) _________________?A. ∝ t
B. ∝ 1/t
C. ∝ √t
D. Independent of ‘t’Which type of heat exchanger is preferred for heavy heat loads ?
Which type of heat exchanger is preferred for heavy heat loads ?A. Double pipe
B. Plate fine
C. Series and parallel set of shell and tube
D. None of these