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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be

Sixteen times
Eight times
Double
Four times

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Hydraulics and Fluid Mechanics in ME
When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wave), the portion of pipe length subjected to maximum head is

L/4
L
L/3
L/2

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Hydraulics and Fluid Mechanics in ME
The specific speed of a turbine is given by the equation

N√P / H5/4
N√P / H3
N√P / H²
N√P / H3/2

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Hydraulics and Fluid Mechanics in ME
A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is

0.64
0.78
0.87
0.46

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Hydraulics and Fluid Mechanics in ME
Which of the following pump is generally used to pump highly viscous fluid?

Air lift pump
Reciprocating pump
Screw pump
Centrifugal pump

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Hydraulics and Fluid Mechanics in ME
The Metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.

The bodies A and B are unstable
The body B is more stable than body A
The bodies A and B have equal stability
The body A is more stable than body B

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