155037983-Fluid-Mechanics-Problems-Quiz-Multiple-Choice-Questions-Download-Free-Preparation-for-Engi

Which of the following statements is correct a lower

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57. Which of the following statements is correct? a) Lower critical Reynolds number is of no practical significance in pipe flow problems.b) Upper critical Reynolds number is significant in pipe flow problems.c) Lower critical Reynolds number has the value 2000 in pipe flowd) Upper critical Reynolds number is the number at which turbulent flow changes to laminarflow.Ans: a 58. For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through aliquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number willbe 59. The shear stress distribution for a fluid flowing in between the parallel plates, bothat rest, is 60. If x is the distance from leading edge, then the boundary layer thickness in laminarflow varies as 61. Stanton diagram is a a) log-log plot of friction factor against Reynolds numberb) log-log plot of relative roughness against Reynolds numberc) semi-log plot of friction factor against Reynolds numberd) semi-log plot of friction factor against relative roughnessAns: a 62. The depth 'd' below the free surface at which the point velocity is equal to theaverage velocity of flow for a uniform laminar flow with a free surface, will be 63. The boundary layer thickness in turbulent flow varies as 64. The distance y from pipe boundary, at which the point velocity is equal to averagevelocity for turbulent flow, is Fluid Mechanics Problems Quiz multiple choice questions download fr... 8 of 13 21-Jul-13 7:32 AM
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