If E1 and E2 are the specific energies at the start of back water curve and at t

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If E₁ and E₂ are the specific energies at the start of back water curve and at the maximum rise of water respectively and ib and ie are the head slope and the energy line slope respectively, the length of back water (L) is given by
Options
A.
B.
C.
D. None of these.

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1. Most economical section of a circular channel for maximum velocity, is if,
Options
A. depth of water = 0.810 diameter
B. hydraulic mean depth = 0.304 diameter
C. wetted perimeter = 2.245 diameters
D. all the above.

3. The initial difference between liquid levels of two identical cylindrical vessels having their area of cross-section A, is H. Flow time T from one vessel to another through an orifice having coefficient of discharge C_d and area a will be
Options
A.
B.
C.
D.

5. In an inclined pipe, the pressure difference at its two ends is due to
Options
A. sudden head drop at inlet
B. exit head drop
C. frictional loss head
D. elevation head
E. all the above.

8. Pick up the incorrect statement from to following regarding triangular notch :
Options
A. For measuring low discharge, it gives more accurate result
B. Only one reading (i.e. H) is required for computation of discharge
C. Ventilation is necessary
D. None of these.

10. The width of a weir with end contraction, is
Options
A. equal to the width of the channel
B. less than the width of the channel
C. half the width of the channel
D. none of these.

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