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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The pitot tube is used to measure

velocity at stagnation point
static pressure
dynamic pressure
stagnation pressure

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Hydraulics and Fluid Mechanics in ME
The length of a pipe is 1 km and its diameter is 20 cm. If the diameter of an equivalent pipe is 40 cm, then its length is

32 km
4 km
8 km
20 km

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Hydraulics and Fluid Mechanics in ME
The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to

1/2 × depth
1/4 × (depth + breadth)
1/2 × breadth
1/2 × sloping side

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Hydraulics and Fluid Mechanics in ME
For manometer, a better liquid combination is one having

lower surface tension
higher surface tension
surface tension is no criterion
high density and viscosity

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Hydraulics and Fluid Mechanics in ME
If the net positive suction head (NPSH) requirement for the pump is not satisfied, then

No flow will take place
Cavitation will be formed
Efficiency will be low
Excessive power will be consumed

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Hydraulics and Fluid Mechanics in ME
The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece, and H = Height of liquid above the mouthpiece)

1.585 a.√(2gH)
0.855 a.√(2gH)
1.855 aH.√(2g)
5.85 aH.√(2g)

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