Civil Engineering MCQs

Page No. 146

Coefficient of discharge of an ogee spillway________________?


a depends on depth of approach and upstream slope


bdepends on downstream apron interference and downstream submergence


cremains constant


d both (A) and (B)


View Answer both (A) and (B)

In case of non-availability of space due to topography, the most suitable spillway is________________?


astraight drop spillway


b shaft spillway


c chute spillway


dogee spillway


View Answer shaft spillway

For the upstream face of an earthen dam, the most adverse condition for stability of slope is_______________?


asudden drawdown


b steady seepage


cduring construction


dsloughing of slope


View Answer sudden drawdown

Generally the weir is aligned at right angles to the direction of the main river current because______________?


ait ensures less length of the weir


b it gives better discharging capacity


cit is economical


dall of the above


View Answer all of the above

A divide wall is provided_______________?


aat right angle to the axis of weir


b parallel to the axis of weir and up-stream of it


cparallel to the axis of weir and down-stream of it


d at an inclination to the axis of weir



Silt excluders are constructed on the________________?


ariver bed upstream of head regulator


b river bed downstream of head regulator


ccanal bed upstream of head regulator


dcanal bed downstream of head regulator



The minimum size of stone that will remain at rest in a channel of longitudinal slope S and hydraulic mean depth R is given by______________?


a4RS


b 11 RS


c7RS


d15 RS


View Answer 11 RS

Wetted perimeter of a regime channel for a discharge of 64 cumecs as per Lacey’s theory will be_________?


a19 m


b38m


c57m


d76m


View Answer 38m

For a proportional outlet, the flexibility is______________?


azero


b between zero and 1


c 1


d greater than 1


View Answer 1

If the critical shear stress of a channel is xc, then the average value of shear stress required to move the grain on the bank is___________________?


a0.5 xc


b0.75 TC


c xc


d1.33 TC


View Answer 0.75 TC

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