21. The discharge over a rectangular notch is (where b = Width of the notch, and H = Height of liquid, above the sill of the notch)

22. The discharge through a siphon spillway is

23. The maximum discharge over a broad crested weir is

A. 0.384 C_d x L x H^1/2
B. 0.384 C_d x L x H^3/2
C. 1.71 C_d x L x H^1/2
D. 1.71 C_d x L x H^3/2

24. In a venturimeter, the velocity of liquid at throat is __________ than at inlet.

A. higher
B. lower

25. The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place is (where R_N = Reynold number)

A. 1/R_N
B. 4/R_N
C. 16/R_N
D. 64/R_N

26. Which of the following is an example of laminar flow?

A. Underground flow
B. Flow past tiny bodies
C. Flow of oil in measuring instruments
D. all of these

27. The pressure less than atmospheric pressure is known as

A. suction pressure
B. vacuum pressure
C. negative gauge pressure
D. all of these

28. The total energy line lies over the hydraulic gradient line by an amount equal to the

A. pressure head
B. velocity head
C. pressure head + velocity head
D. pressure head – velocity head

29. A structure whose width is __________ the width of the channel is called a flumed structure.

A. less than
B. more than

30. The maximum efficiency of transmission through a pipe is

A. 50%
B. 56.7%
C. 66.67%
D. 76.66%