Civil Engineering MCQs

Page No. 185

For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be_________________?


a300


b337.5


c 600


d675


View Answer 675

The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be_________________?


a 0.423 D


b 0.577 D


c0.223 D


d0.707 D



In case of an airfoil, the separation of flow occurs________________?


a at the extreme rear of body


b at the extreme front of body


cmidway between rear and front of body


dany where between rear and front of body depending upon Reynolds number



The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is________________?


a 0.223 R


b0.423 R


c0.577 R


d 0.707 R


View Answer 0.223 R

With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on__________________?


a a circular disc of plate held normal to flow


b a sphere


ca cylinder


da streamlined body



For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is_______________?


a constant


bdependent only on Reynolds number


c a function of Reynolds number and relative roughness


d dependent on relative roughness only



For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is________________?


adirectly proportional to Reynolds number and independent of pipe wall roughness


bdirectly proportional to pipe wall roughness and independent of Reynolds number


cinversely proportional to Reynolds number and indpendent of pipe wall roughness


dinversely proportional to Reynolds number and directly proportional to pipe wall roughness



The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is_______________?


a 1/2


b 2/3


c3/2


d2


View Answer 1/2

The discharge of a liquid of kinematic viscosity 4 cm2/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is__________________?


alaminar flow


btransition flow


c turbulent flow


dnot predictable from the given data


View Answer laminar flow

The velocity distribution for laminar flow through a circular tube__________________?


a is constant over the cross-section


b varies linearly from zero at walls to maximum at centre


cvaries parabolically with maximum at the centre


dnone of the above



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