Civil Engineering MCQs

Page No. 148

The net speed under which the turbine reaches its peak efficiency is called_________________?


adesign speed


brated speed


c gross speed


doperating speed


View Answer design speed

The net head under which the turbine reaches its peak efficiency at synchronous speed is called________________?


adesign head


brated head


cgross head


doperating head


View Answer design head

A hydroelectric scheme operating under a head of 80 m will be classified as_____________?


alow head scheme


b medium head scheme


chigh head scheme


dnone of the above


View Answer high head scheme

The maximum rainfall depth of 300 mm in 24 hours has a return period of 100 years. The probability of 24 hours rainfall equal to or greater than 300 mm occurring at least once in 10 years is given by_____________?


a(0.99)10


b1 – (0.99)10


c (0.9)’00


d. l-(0.9)100


View Answer 1 – (0.99)10

Which of the following methods is used to estimate flood discharge based on high water marks left over in the past ?


aslope-area method


barea-velocity method


cmoving boat method


dultra-sonic method


View Answer slope-area method

The stream which does not have any base flow contribution is called________________?


aperennial stream


bintermittent stream


cephemeral stream


dnone of the above


View Answer ephemeral stream

If the demand line drawn from a ridge in a flow mass curve does not intersect the curve again, it indicates that______________?


ademand cannot be met by inflow


breservoir was not full at the beginning


cboth (A) and (B)


dnone of the above



If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be__________________?


a1 + (0.9)010


b1 – (0.9)°l0


c1/(1-0.9°10)


d1/(1+ 0.9010)


View Answer 1/(1-0.9°10)

A unit hydro graph has one unit of_______________?


arainfall duration


brainfall excess


ctime base of direct runoff


d discharge


View Answer rainfall excess

For an annual flood series arranged in descending order of magnitude, the return for a magnitude listed at position period m in a total data N is________________?


aN/(m+l)


bm/(N+l)


cm/N


d(N+l)/m


View Answer (N+l)/m

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