Water is normally used as a coolant in the heat exchange equipments mainly because of its___________________?

Related Mcqs:

Pick out the wrong statement ?

A. In drying a solid containing moisture above the critical moisture content the number of degrees of freedom is 2 B. Sherwood number in mass transfer corresponds to Nusselt number in heat transfer and Schmidt number to Prandtl number C. Forced convection is relatively more effective in increasing the rate of mass transfer, if Schmidt … Pick out the wrong statement ?Read More...

In forced convection, the Nusselt number is a function of ____________________?

A. Re and Pr B. Re and Gr C. Pr and Gr D. Re and Sc...

Fqra cold viscous feed, backward feed gives _____________ than forward feed?

A. A higher capacity B. A lower capacity C. Lower economy D. None of these...

Kirchoff’s law is applicable to________________?

A. Monochromatic radiation only B. Total radiation only C. Both A. and B. D. Only volumes and not to surfaces...

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__________________?

A. Greater than that for un-insulated steam pipe B. Less than that of the un-insulated steam pipe C. Equal to that of the un-insulated steam pipe D. Less than the steam pipe with 5 cms insulation...