For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are__________________?

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Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the_________________?

A. Existence of thermal boundary layer B. Temperature gradient produced due to density difference C. Buoyancy of the bubbles produced at active nucleation site D. None of these...

Pick out the wrong statement?

A. Bubble size increases with the dynamic viscosity of the liquid in case of nucleate pool boiling B. Thermal conductivity of a dry material is more than that of the damp material C. Ratio of its capacity to economy equals the steam consumption in kg/hr in an evaporator D. Vaporisation of organic substances in evaporator … Pick out the wrong statement?Read More...

The actual temperature drop across the heating surface of an evaporator depends on the_______________?

A. Liquid depth over the heating surface B. Solution being evaporated C. Pressure difference between the steam chest and the vapor space above the boiling liquid D. All A., B. and C....

With increase in temperature, the thermal conductivity of fresh lubricating oil ___________________?

A. Increases B. Decreases C. Remains unchanged D. May increase or decrease; depends on its composition...

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

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