Question

(0) In spite of being 'forced, a forced convection is not as efficient as free convection in removing heat from a vertical hot plate. True / False (ii) Computer components are designed such that the are cooled due to natural convection. This cooling will be even more effective if the computer is on the space station. True / False (iii) Birds take advantage of natural convection while soaring. True / False (iv) A fictitious planet similar to earth has an atmosphere, otherwise similar to earth's, has a ß value twice as that of earth's. Hot-air ballooning on that planet will be tougher there compared to that on earth. True / False (v) A hot plate will cool better when held horizontal than when held vertical as larger area of hot air will be exposed to gravity. True / False (vi) Boussinesq approximation transplants incompressibility in an otherwise compressible boundary layer equation. True / False (vii) Free convection involves a higher value of convection heat transfer coefficient h compared to a forced convection. True / False (viii) Assuming that moon has the same atmosphere as earth, a boiled egg will take same time to cool off as it will take on the earth. True False = (ix) If you observe the Grashof number, Grı force and viscous force. True / False gß (Ts-T.) v2 carefully it is ratio of buoyancy (x) What Grashof number is to free convection flow, Reynolds number is to forced convection flow. True / False

Answer 1

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