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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by

V/(vr + v)
V/(vr - v)
2V/(vr + v)
2V/(vr - v)

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Hydraulics and Fluid Mechanics in ME
An average value of coefficient of velocity is

0.62
0.84
0.97
0.76

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Hydraulics and Fluid Mechanics in ME
The specific weight of water in S.I. units is taken as

Any one of these
9.81 × 103 N/m3
9.81 kN/m3
9.81 × 10-6 N/mm3

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Hydraulics and Fluid Mechanics in ME
Air vessels in reciprocating pump are used to

Save pump from cavitations
Smoothen flow
Reduce acceleration to minimum
Increase pump efficiency

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Hydraulics and Fluid Mechanics in ME
One horsepower is equal to

102 watts
735 watts
75 watts
550 watts

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Hydraulics and Fluid Mechanics in ME
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by

dQ/Q = 3 × (dH/H)
dQ/Q = 3/2 × (dH/H)
dQ/Q = 5/2 × (dH/H)
dQ/Q = 2 × (dH/H)

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