51.
For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)

52.
The critical radius 'r' of insulation on a pipe is given by

53.
Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by

54.
Which of the following is the most controlling factor for the rate of bubble detachment from the hot solid surface?

55.
Leidenfrost point is a term concerned with the

58.
Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the

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