Answer Happy

viii- The extended surface used for the enhancement of heat dissipation is: a- Convective coefficient b- Fourier number C- Fin d- No finned surface is- Heat transfer takes place according to which law? a- Newton's law of cooling b- Second law of thermodynamics c- Newton's second law of motion d- First law of thermodynamics I- On a heat transfer surface, fins are provided to: a- Increase turbulence in flow for enhancing heat transfer b- Increase temperature gradient so as to enhance heat transfer C- Pressure drop of the fluid should be minimized d- Surface area is maximum to promote the rate of heat transfer xi- How is a Plate-type HE better than a Shell and tube HE, one of the following is not correct: a- Plate type heat exchangers have much higher heat transfer area than Shell and tube ones b- Thermal stress is higher in Plate type HE C-Vibrations due to flow and noise are comparatively absent in Plate type HE d- Entry impingement problem of shell and tube is absent in Plate type HE C-