Civil Engineering MCQs

Page No. 188

The Prartdtl mixing length is_________________?


azero at the pipe wall


bmaximum at the pipe wall


cindependent of shear stress


dnone of the above


View Answer zero at the pipe wall

The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is_______________?


a1/3 R


b1/2 R


c2/3 R


d3/4R


View Answer 1/3 R

Separation of flow occurs when_________________?


a the pressure intensity reaches a minimum


bthe cross-section of a channel is reduced


cthe boundary layer comes to rest


dall of the above



The value of friction factor ‘f’ for smooth pipes for Reynolds number 106 is approximately equal to________________?


a0.1


b0.01


c0.001


d0.0001


View Answer 0.01

In which of the following the friction drag is generally larger than pressure drag?


aa circular disc or plate held normal to flow


ba sphere


c a cylinder


dan airfoil


View Answer an airfoil

When an ideal fluid flows past a sphere________________?


ahighest intensity of pressure occurs around the circumference at right angles to flow


b lowest pressure intensity occurs at front stagnation point


clowest pressure intensity occurs at rear stagnation point


dtotal drag is zero


View Answer total drag is zero

Stanton diagram is a______________?


a log-log plot of friction factor against Reynolds number


blog-log plot of relative roughness against Reynolds number


csemi-log plot of friction factor against Reynolds number


dsemi-log plot of friction factor against relative roughness



Ay between two stream lines represents________________?


avelocity


bdischarge


chead


dpressure


View Answer discharge

The boundary layer thickness in turbulent flow varies as______________?


ax”7


bx,/2


cx4/5


d x3/5


View Answer x4/5

The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is_______________?


aconstant over the cross section


b parabolic distribution across the section


czero at the mid plane and varies linearly with distance from mid plane


d zero at plates and increases linearly to midpoint



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