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Fluid Mechanics

Fluid Mechanics
The peripherial velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec.

1.8
186.2
736.4
12.4

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Fluid Mechanics
Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the first fluid, the pressure drop will

Increase
Data insufficient to predict relative pressure drop
Remain unchanged
Decrease

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Fluid Mechanics
A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m³/s? The Fanning friction factor, f is 0.0062.

12 m
10 m
11 m
20 m

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Fluid Mechanics
Low specific speed of a pump implies that, it is a/an __________ pump.

Mixed flow
Axial flow
Centrifugal
None of these

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Fluid Mechanics
For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter)

Vs²/Dp²
Vs/Dp³
Vs²/Dp³
Vs/Dp²

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Fluid Mechanics
In frictional fluid flow, the quantity, P/ρ + V²/2gc + gz/gc, is

None of these
Increased in the direction of flow
Not constant along a streamline
Constant along a streamline

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