Civil Engineering MCQs

Page No. 187

The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is__________________?


a0.40 cm

✖


b0.20 cm

✓


c0.10 cm

✖


d0.05 cm

✖


View Answer 0.20 cm

Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is________________?


aless than d

✓


bbetween d and 1.5 d

✖


cbetween 1.5 d and 2d

✖


dgreater than 2d

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View Answer less than d

The length of a pipe is 1 km and its diameter is 20 cm. If the diameter of an equivalent pipe is 40 cm, then its length is_____________________?


a32 km

✓


b20 km

✖


c8 km

✖


d4 km

✖


View Answer 32 km

When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wavE., the portion of pipe length subjected to maximum head is__________________?


a L/4

✓


b L/3

✖


c L/2

✖


dL

✖


View Answer L/4

A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be________________?


a1 m

✖


b 10m

✖


c100m

✓


dnone of the above

✖


View Answer 100m

In series-pipe problems_______________?


athe head loss is same through each pipe

✖


bthe discharge is same through each pipe

✓


ca trial solution is not necessary

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d the discharge through each pipe is added to obtain total discharge

✖



If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is________________?


a less than 1

✖


bbetween 1 and 100

✖


c160

✓


d200

✖


View Answer 160

The hydraulic grade line is_________________?


aalways above the centre line of pipe

✖


bnever above the energy grade line

✓


calways sloping downward in the direction of flow

✖


dall of the above

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The wake_______________?


a always occurs before a separation point

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balways occurs after a separation point

✓


cis a region of high pressure intensity

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dnone of the above

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A fluid of kinematic viscosity 0.4 cm2/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be__________________?


a less than 1 m/sec

✖


b1 m/sec

✓


c1.5 m/sec

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d 2 m/sec

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View Answer 1 m/sec

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