Chemical Heat Transfer | Test For NTS PPSC FPSC, TEST

A. Geometric mean temperature difference
B. Arithmetic mean temperature difference
C. Logarithmic mean temperature difference
D. The difference of average bulk temperatures of hot and cold fluids

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Category: Chemical Heat Transfer

Prandtl number for most of dry gases is about________________?

jH factor for heat transfer is not a function of the _______________ number?

For a laminar flow of fluid in a circular tube, ‘h1’ is the convective heat transfer co-efficient at velocity ‘V1’. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is________________?

The critical radius ‘r’ of insulation on a pipe is given by____________________?

The energy radiated from a surface Q at absolute temperature T is related as__________________?

In the equation Q = UAΔt; Δt is_________________________?

Out of the following four assumptions used in the derivation of the equation for LMTD [LMTD = (Δt1 – Δt2)/ln(Δt1/Δt2)], which one is subject to the largest deviation in practice ?

Planck’s distribution law is valid for _____________ bodies?

Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because___________________?

A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an___________________?