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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The specific speed of a centrifugal pump, delivering 750 liters of water per second against a head of 15 meters at 725 r.p.m., is

82.4 r.p.m.
24.8 r.p.m.
48.2 r.p.m
248 r.p.m

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Hydraulics and Fluid Mechanics in ME
Which of the following is used to measure the discharge ?

hotwire anemometer
venturimeter
pitot tube
current meter

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

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

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Hydraulics and Fluid Mechanics in ME
Low specific speed of turbine implies it is

Any one of the above
Francis turbine
Impulse turbine
Propeller turbine

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Hydraulics and Fluid Mechanics in ME
The discharge through a reaction turbine ___ with the increase in unit speed.

None of the listed here
Remain same
Decreases
Increases

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