Graetz number is given by__________________?
Graetz number is given by__________________?
A. mCp/kL
B. kL/mCp
C. mCp/kμ
D. kμ/mCp
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Double pipe heat exchangers are preferably useful, when____________________?
Double pipe heat exchangers are preferably useful, when____________________?A. High viscosity liquid is to be cooled
B. Requirement of heat transfer area is low
C. Overall heat transfer co-efficient is very high
D. A corrosive liquid is to be heatedIn case of heat transfer by conduction in a hollow cylinder, ______________ mean area is used to calculate the heat transfer rate?
In case of heat transfer by conduction in a hollow cylinder, ______________ mean area is used to calculate the heat transfer rate?A. Geometric
B. Arithmetic
C. Logarithmic
D. Either A., B. or C.The 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’The overall resistance for heat transfer through a series of flat resistance, is the _____________ of the resistances?
The overall resistance for heat transfer through a series of flat resistance, is the _____________ of the resistances?A. Average
B. Geometric mean
C. Product
D. SumWhen vaporisation takes place through a blanketting film of gas, the phenomenon is termed as ___________________ boiling?
When vaporisation takes place through a blanketting film of gas, the phenomenon is termed as ___________________ boiling?A. Pool
B. Nucleate
C. Transition
D. FilmThe purpose of providing a ‘catchall’ in the vapor line of an evaporator is to__________________?
The purpose of providing a ‘catchall’ in the vapor line of an evaporator is to__________________?A. Create vacuum
B. Regulate the vapor flow
C. Vent the non-condensable gases
D. Arrest the entrained liquid