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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The value of coefficient of velocity for a sharp edged orifice __________ with the head of water.

None of these
Remain same
Increases
Decreases

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Hydraulics and Fluid Mechanics in ME
Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of

Lower speed of operation
Lower discharge
High initial and maintenance cost
Necessity of air vessel

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Hydraulics and Fluid Mechanics in ME
The surface tension of mercury at normal temperature is __________ that of water.

None of these
Lower than
Higher than
Same as

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Hydraulics and Fluid Mechanics in ME
Medium specific speed of a pump implies it is

Centrifugal pump
Mixed flow pump
Axial flow pump
Any one of the above

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Hydraulics and Fluid Mechanics in ME
Theoretical power required (in watts) to drive a reciprocating pump is (where w = Specific weight of liquid to be pumped in N/m3, Q = Discharge of the pump in m3/s, Hs = Suction head in meters, and Hd = Delivery head in meters)

wQ (Hs - Hd)
wQHd
wQHs
wQ (Hs + Hd)

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Hydraulics and Fluid Mechanics in ME
Centrifugal pump is started with its delivery valve

Kept 50% open
Irrespective of any position
Kept fully closed
Kept fully open

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