A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m2.°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be__________________?

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Loss of heat from untagged steam pipe to the ambient air is by __________________?

A. Conduction B. Convection C. Radiation D. All A., B. & C....

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 ?

A. Constant overall heat transfer co-efficient. B. Constant rate of fluid flow C. Constant specific heat D. No partial phase change in the system...

A composite flat wall of a furnace is made of two materials ‘A’ and ‘B’. The thermal conductivity of ‘A’ is twice of that of material ‘B’, while the thickness of layer of ‘A’ is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material ‘A’ is________________?

A. 125 B. 133 C. 150 D. 160...

Pick out the wrong statement ?

A. The condensing film co-efficient is about 3 times lower for vertical condenser as compared to the equivalent horizontal condenser for identical situation B. Film co-efficient for vaporisation decreases as a result of vapor binding C. In industrial practice, sub-cooling of condensate is required, when the condensate is a volatile liquid and is to be … Pick out the wrong statement ?Read More...

In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of___________________?

A. Concentrations B. Chemical potentials C. Activity co-efficients D. Mass transfer co-efficients...