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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies

Cube of fan speed
Directly as fan speed
Square of fan speed
Square root of fan speed

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Hydraulics and Fluid Mechanics in ME
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is

0.5 v₁²/2g
0.375 v₂²/2g
v₁²/2g
v₂²/2g

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Hydraulics and Fluid Mechanics in ME
An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be

14 kN/m2
12 kN/m2
4 kN/m2
10 kN/m2

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Hydraulics and Fluid Mechanics in ME
The viscosity of water is __________ than that of mercury.

Higher
Lower
None of these
Same as

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Hydraulics and Fluid Mechanics in ME
A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used?

Francis turbine
Pelton wheel with one nozzle
Kaplan turbine
Pelton wheel with two or more nozzles

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Hydraulics and Fluid Mechanics in ME
In order to avoid cavitation in centrifugal pumps

The suction pressure should be high
The suction pressure should be low
The delivery pressure should be low
The delivery pressure should be high

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