Chemical Heat Transfer | Test For NTS PPSC FPSC, TEST

Pick out the wrong statement?

A. Fluid movement under the influence of buoyant forces resulting from change in density takes place in case of natural convection
B. The ratio NNu/NRe . Npr is called the Stanton number
C. The Peclet number is a measure of the ratio of energy transport by convection to that by conduction
D. The Colburn jH factor for heat transfer is given by Nst Npr

Pick out the correct statement ?

A. Higher is the temperature of the radiating body, higher is the wavelength of radiation
B. Logarithmic mean area is used for calculating the heat flow rate through a thick walled
cylinder
C. The wavelength corresponding to maximum mono-chromatic emissive power increases with
rise in temperature
D. Solid angle subtended by the finite surface at the radiating element is called the angle of
incidence

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Category: Chemical Heat Transfer

For a perfectly transparent surface (like gases), the____________________?

Which of the following is correct ?

In SI units, thermal conductivity is expressed in__________________?

Pick out the wrong statement?

For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area___________________?

Pick out the correct statement ?

Crystal size in a continuous crystalliser depends upon the___________________?

For small temperature difference, the heat transfer rate as per Newton’s law of cooling is proportional to (where, Δt = excess temperature) ?

The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K0 + at, where, K is the thermal conductivity and T is the temperature (in °K). The units of ‘a’ in SI system will be________________?

The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the___________________?