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.Management Sciences
Category: Chemical Heat Transfer
Film condensation is promoted on a/an _______________________ surface?
A. Oily
B. Coated
C. Clean & smooth
D. Dirty
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
The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is___________________?
A. More
B. Less
C. Some
D. Either more or less; depends on the nature of vapor
Which one gives the monochromatic emissive power for black body radiation ?
A. Planck’s law
B. Kirchhoff’s law
C. Wien’s law
D. Stefan-Boltzmann law
Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling ?
A. Square pitch
B. Triangular pitch
C. Diagonal square pitch
D. None of these
_____________ heat exchanger is used for chilling oil to be dewaxed?
A. U-tube
B. Double pipe
C. Fixed tube
D. Floating head
Which of the following has the minimum absorptivity ?
A. Aluminium foil
B. Coal dust
C. Refractory bricks
D. Iron plates
Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?
A. Dittus-Boelter equation
B. Sieder-Tate equation
C. Nusselt equation
D. None of these
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