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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)

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22. The discharge through a siphon spillway is

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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

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

A. higher
B. lower

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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

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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

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27. The pressure less than atmospheric pressure is known as

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

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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

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

A. less than
B. more than

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30. The maximum efficiency of transmission through a pipe is

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

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