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Civil Engineering Objective Questions { Hydraulics }

120.  In a short cylindercial external mouthpiece, the venacontracta occurs at a distance from the outlet of orifice equal to
A. diameter of the orifice
B. one-fourth the diameter of the orifice
C. one-third the diameter of the orifice
D. two-third the diameter of the orifice

121. The shape of fire hose nozzle is generally kept
A. divergent
B. convergent
C. convergent divergent
D. cylindrical.

122. A short tube mouthpiece will not run full at its outlet if the head under which the orifice works, is
A. less than 12.2 m of the water
B. more than 12.2 m of the water
C. equal of 12.2 m of water
D. none of these.

123.  A piezometer opening in pipes measures
A. velocity head
B. static pressure
C. total pressure
D. negative static pressure.

124.  In an inclined position, a venturimeter records
A. more reading
B. less reading
C. same reading
D. none of these.

125.  If H is the difference of liquid levels on two sides of an orifice (width b, depth d), the discharge through the orifice will be
A. Cdbd2127g#
B. Cdb2d2Nrf
C. Cdbd2VW
D. C dbd .2g H112 .

126.  Water flows through a convergent mouthpiece of diameter 4 cm at convergence under a head of 3 metres. If the maximum vacuum pressure is 9 metres of water, the maximum diameter of divergence, to aviod separation of flow, is
A. 4 cm
B. 6 cm
D. 3 cm.

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