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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
Specific weight of sea water is more that of pure water because it contains

suspended matter
dissolved air
All of these
dissolved salt

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Hydraulics & Fluid Mechanics
For a floating body to be in equilibrium

a righting couple should be formed
meta center should be above e.g.
All of these
center of buoyancy and e.g. must lie on same vertical plane

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Hydraulics & Fluid Mechanics
Two pipe systems are said to be equivalent when

head loss and discharge are same in two systems
friction factor and length are same in two systems
length of pipe and discharge are same in two systems
length and diameter are same in two systems

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Hydraulics & Fluid Mechanics
A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?

1 :25
1 : 5
1:50
1 : 2.5

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Hydraulics & Fluid Mechanics
The increase in meta centric height i) increases stability ii) decreases stability iii) increases comfort for passengers iv) decreases comfort for passengers The correct answer is

(i) and (iii)
(i) and (iv)
(ii) and (iii)
(ii) and (iv)

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Hydraulics & Fluid Mechanics
For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be

300
337.5
675
600

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