337.  Pick up the correct statement from the following :
A. For tranquil flow h > .Ni2T, or v < ? 2g
B. For critical flow h = 02
C. For torrential flow h > -2 or v < -Igh
D. None of these.

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338. The phenomenon occuring in an open channel when a rapidly flowing stream abruptly changes to a slowly flowing stream causing a distinct rise of liquid surface, is
A. water hammer
B. hydraulic jump
C. critical discharge
D. none of these.

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339.  Back water curve is caused if
A. friction head loss is more than the bed slope
B. pressure is due to weir in the channel
C. there is an increase in width of the channel
D. none of these.

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340.  Hydraulic ram is a device
A. for lifting water without an electric motor
B. for accelerating water flow
C. for lifting heavy loads
D. none of these.

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341. An ideal fluid
A. is frictionless and incompressible
B. obeys Newton's law of velocity
C. is similar to gas
D. is very viscous.

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342. Flow of water in pipes of diameter more than 3 metres, can be measured by
A. pitot tube
B. Venturimeter
C. orifice plate
D. rotameter.

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343.  An orifice is taken as large if
A. (H2 - HO> H
B. (H2 Hi) > H/4
C. (H2 - Hi) > H/2
D. (H2 Hi) > H/3.

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