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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
For pipes, laminar flow occurs when Reynolds number is

Less than 2000
Between 2000 and 4000
Less than 4000
More than 4000

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Hydraulics and Fluid Mechanics in ME
Which of the following velocity potentials satisfies continuity equation ?

x2 + y2
cosx
x2y
x2-y2

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Hydraulics and Fluid Mechanics in ME
In a depressed nappe

The pressure above the nappe is atmospheric
The pressure above the nappe is negative
The pressure below the nappe is negative
The pressure below the nappe is atmospheric

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Hydraulics and Fluid Mechanics in ME
A Pelton wheel develops 1750 kW under a head of 100 meters while running at 200 r.p.m. and discharging 2500 liters of water per second. The unit speed of the wheel is

80 r.p.m.
10 r.p.m.
20 r.p.m.
40 r.p.m.

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

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Hydraulics and Fluid Mechanics in ME
In a centrifugal pump, the regulating valve is provided on the

Suction pipe
Casing
Delivery pipe
Impeller

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