For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally ?

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Evaporator tubes are generally_____________________?

A. Horizontal B. Vertical C. Inclined D. Random...

Solid angle subtended by the finite surface at the radiating element is_________________?

A. Called the view factor B. Called the angle of vision C. Proportional to the square of the distance between surfaces D. Expressed in terms of radians...

Stefan-Boltzmann law applies to _____________ body?

A. Black B. White C. Grey D. Any colour...

Peclet number (Pe) is given by____________________?

A. Pe = Re.Pr B. Pe = Re/Pr C. Pe = Pr/Re D. Pe = Nu.Re...

Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is________________?

A. Finned tube heat exchanger with air inside and steam outside B. Finned tube heat exchanger with air outside and steam inside C. Shell and tube heat exchanger with air inside tubes and steam on shell side D. Shell and tube heat exchanger with air on shell side and steam inside tubes...