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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Hydrometer is used to determine

specific gravity of liquids
specific gravity of solids
specific gravity of gases
relative humidity

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Hydraulics and Fluid Mechanics in ME
The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)

μπ²NR³/60t
μπ²NR/60t
μπ²NR²/60t
μπ²NR⁴/60t

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Hydraulics and Fluid Mechanics in ME
According to fan laws, at constant speed and capacity, the pressure and power vary

As square of density
Inversely as square root of density
Inversely as density
Directly as the air or gas density

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Hydraulics and Fluid Mechanics in ME
If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is

(V­1² - V2²) / V1²
V1 / (V1 - V2)
V1² / (V1² - V2²)
(V­1 - V2) / V1

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Hydraulics and Fluid Mechanics in ME
If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water , the horse power required will be

0.75 B.H.P
Same
1.5 B.H.P
H.P./0.75

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Hydraulics and Fluid Mechanics in ME
Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?

Hydraulic ram
Hydraulic accumulator
Hydraulic intensifier
Hydraulic torque converter

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