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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The centre of pressure for a vertically immersed surface lies at a distance equal to __________ the centre of gravity.

Ax̅ / IG below
IG / Ax̅ below
IG / Ax̅ above
Ax̅ / IG above

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

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Hydraulics and Fluid Mechanics in ME
The mass per unit volume of a liquid at a standard temperature and pressure is called

Specific gravity
Specific weight
None of these
Mass density

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Hydraulics and Fluid Mechanics in ME
Unit of surface tension is

Energy/unit area
It has no units
Velocity/unit area
Both of the above

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Hydraulics and Fluid Mechanics in ME
Differential monometer is used to measure

difference of pressure between two points
pressure in pipes, channels etc
atmospheric pressure
very low pressure

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Hydraulics and Fluid Mechanics in ME
The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be (where D is the depth of flow)

0.577 D
0.707 D
0.423 D
0.223 D

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