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Hydraulics and Fluid Mechanics in ME

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

between 2000 and 4000
less than 4000
more than 4000
less than 2000

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Hydraulics and Fluid Mechanics in ME
The most efficient section of a channel is

Trapezoidal
Square
Rectangular
Triangular

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Hydraulics and Fluid Mechanics in ME
The torque required to overcome viscous resistance of a collar bearing is (where R1 and R2 = External and internal radius of collar)

μπ²N/60t) × (R₁³ - R₂³)
(μπ²N/60t) × (R₁² - R₂²)
(μπ²N/60t) × (R₁ - R₂)
(μπ²N/60t) × (R₁⁴ - R₂⁴)

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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

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

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Hydraulics and Fluid Mechanics in ME
The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is

0.0611 stoke
0.611 stoke
0.0116 stoke
0.116 stoke

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Hydraulics and Fluid Mechanics in ME
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by

dQ/Q = (dH/H)
dQ/Q = (3/4) × (dH/H)
dQ/Q = (3/2) × (dH/H)
dQ/Q = (1/2) × (dH/H)

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