176. 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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177.  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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178.  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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179.  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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180.  An orifice is taken as large if
A. (H2 ? Hi) > H
B. (H2 ? Hi) > HI 4
C. (H2 ? H1) > H12
D. (H2 ? H1) > H13.

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181. The discharg formula Q = Cd "NlYlif X A is used for rectangular
A. small orifices only
B. large orifices only
C. small and large orifices only
D. for all types of orifices.

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182. Though angle of deviation of liquid is more in internal mouth piece, the contraction of the jet, is
A. more in the internal mouth piece
B. less in the internal mouth piece
C. equal to external mouth piece
D. none of these.

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