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.Management Sciences
Category: Chemical Heat Transfer
A dephlegmator is a_____________________?
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A. Total condenser
B. Vacuum evaporator
C. Partial condenser
D. Double pipe heat exchanger
Which of the following has the lowest overall heat transfer co-efficient ?
A. Dowtherm
B. Molten sodium
C. Water
D. Air
Pick out the wrong statement ?
A. Heat transfer from a hot body to cold body by the emission of heat waves is called radiation
B. Filmwise condensation takes place on non-wettable surfaces
C. The boiling point of a solution is affected by liquid head as well as boiling point elevation
D. None of these
Nusselt number is a function of Prandtl number and ______________ number of fluid in natural convection heat transfer?
A. Grashoff
B. Biot
C. Stanton
D. Reynolds
In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to _____________ the velocity head?
A. Twice
B. Four times
C. Square root of
D. Square of
Baffle spacing ____________________?
A. Is not the same as baffle pitch
B. Should be less than one fifth the diameter of the shell
C. Should be less than the inside diameter of the shell
D. None of these
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