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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.

Less than
None of these
Equal to
More than

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Hydraulics and Fluid Mechanics in ME
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to empty the tank completely will be

(2A√H₁)/(Cd × a√2g)
(2AH₁)/(Cd × a√2g)
(2AH₁²)/(Cd × a√2g)
(2AH₁3/2)/(Cd × a√2g)

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Hydraulics and Fluid Mechanics in ME
Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?

None of these
Francis turbine
Kaplan turbine
Pelton wheel

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Hydraulics and Fluid Mechanics in ME
Which of the following pump is successfully used for lifting water to the turbines?

Reciprocating pump
Air lift pump
Jet pump
Centrifugal pump

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Hydraulics and Fluid Mechanics in ME
A fluid of kinematic viscosity 0.4 cm²/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be

2 m/sec
1.5 m/sec
less than 1 m/sec
1 m/sec

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Hydraulics and Fluid Mechanics in ME
If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is

V1² / (V1² - V2²)
(V­1² - V2²) / V1²
V1 / (V1 - V2)
(V­1 - V2) / V1

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