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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal tc

1 kg
100 kg
10 kg
1000 kg

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Hydraulics and Fluid Mechanics in ME
The buoyancy depends on

mass of liquid displaced
viscosity of the liquid
depth of immersion
pressure of the liquid displaced

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Hydraulics and Fluid Mechanics in ME
Centre of pressure compared to e.g. is

at same point
above or below depending on area of body
above it
below it

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Hydraulics and Fluid Mechanics in ME
Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of

84.8%
49.2%
39.2%
68.8%

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Hydraulics and Fluid Mechanics in ME
Center of buoyancy is the

e.g. of floating body
center of pressure of displaced volume
does not exist
centroid of the displaced volume of fluid

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Hydraulics and Fluid Mechanics in ME
The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) is

ηm = ηm × ηh
None of these
ηh = ηo × ηm
ηo = ηh × ηm

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