Civil Engineering MCQs

Page No. 153

Trap efficiency of a reservoir is a function of_______________?


acapacity/inflow ratio


bcapacity/outflow ratio


coutflow/inflow ratio


dnone of the above


View Answer capacity/inflow ratio

The water stored in the reservoir below the minimum pool level is called_______________?


auseful storage


bdead storage


cvalley storage


dsurcharge storage


View Answer dead storage

A multipurpose reservoir is the one which is_________________?


adesigned for one purpose but serves more than one purpose


bplanned and constructed to serve various purposes


cboth (A. and (B.


dnone of the above



An artesian aquifer is the one where______________?


awater surface under the ground is at atmospheric pressure


bwater is under pressure between two impervious strata


c water table serves as upper surface of zone of saturation


dnone of the above



Dimensions of coefficient of transmissibility are______________?


a M°L°T°


brvfL’T”1


cM° L2 T1


dM’LV


View Answer M° L2 T1

S-hydrograph is used to obtain unit hydrograph of________________?


a shorter duration from longer duration


blonger duration from shorter duration


cboth (A) and (B)


dnone of the above


View Answer both (A) and (B)

The unit hydrograph due to a storm may be obtained by dividing the ordinates of the direct runoff hydrograph by_______________?


adirect runoff volume


bperiod of storm


ctotal rainfall


dnone of the above


View Answer direct runoff volume

The normal annual precipitation at stations X, A, B and C are 700 mm, 1000 mm, 900 mm and 800 mm respectively. If the storm precipitation at three station A, B and C were 100 mm, 90 mm and 80 mm respectively, then the storm precipitation for station X will be___________________?


a70mm


b80mm


c 90 mm


d105 mm


View Answer 70mm

If it rains between 2 P.M. and 3 P.M. and the entire basin area just starts contributing water at 3 P.M. to the outlet, then time of concentration will be_____________________?


a 15 minutes


b20 minutes


c30 minutes


d60 minutes


View Answer 60 minutes

The area between the isohyets 45 cm and 55 cm is 100 square km and between 55 cm and 65 cm is 150 square km. The average depth of annua! precipitation over the above basin of 250 square km will be__________________?


a 50 cm


b 55 cm


c 56 cm


d 60 cm


View Answer 56 cm

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