The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) _________________?

Byadmin March 3, 2019August 24, 2021

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’

Chemical Heat Transfer

Graetz number is given by__________________?

Graetz number is given by__________________?

A. mCp/kL
B. kL/mCp
C. mCp/kμ
D. kμ/mCp

Read More Graetz number is given by__________________?
Chemical Heat Transfer

The non-dimensional temperature gradient in a liquid at the wall of a pipe is the ____________________?

The non-dimensional temperature gradient in a liquid at the wall of a pipe is the ____________________?

A. Heat flux
B. Nusselt number
C. Prandtl number
D. Schmidt number

Read More The non-dimensional temperature gradient in a liquid at the wall of a pipe is the ____________________?
Chemical Heat Transfer

For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it__________________?

For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it__________________?

A. Decreases the pressure drop
B. Decreases the outlet temperature of cooling medium
C. Increases the overall heat transfer coefficient
D. None of these

Read More For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it__________________?
Chemical Heat Transfer

Boiling point elevation of an ideal solution_______________?

Boiling point elevation of an ideal solution_______________?

A. Increases rapidly with temperature rise
B. Decreases rapidly with temperature rise
C. In independent of pressure
D. Both B. and C.

Read More Boiling point elevation of an ideal solution_______________?
Chemical Heat Transfer

The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as______________?

The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as______________?

A. (ΔT)1/4
B. (ΔT)1/2
C. (ΔT)5/4
D. (ΔT)3/4

Read More The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as______________?
Chemical Heat Transfer

For heat flow through very thick walled cylinder, use ___________mean radius?

For heat flow through very thick walled cylinder, use ___________mean radius?

A. Arithmetic
B. Logarithmic
C. Geometric
D. Either A. or C.

Read More For heat flow through very thick walled cylinder, use ___________mean radius?

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