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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