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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The optimum value of vane exit angle for a centrifugal pump impeller is

30-40°
20-25°
50-60°
10-15°

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Hydraulics and Fluid Mechanics in ME
The speed ratio in case of Francis turbine varies from

0.6 to 0.9
1 to 1.5
0.15 to 0.3
0.4 to 0.5

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Hydraulics and Fluid Mechanics in ME
The torque required to overcome viscous resistance of a collar bearing is (where R1 and R2 = External and internal radius of collar)

(μπ²N/60t) × (R₁⁴ - R₂⁴)
(μπ²N/60t) × (R₁² - R₂²)
μπ²N/60t) × (R₁³ - R₂³)
(μπ²N/60t) × (R₁ - R₂)

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Hydraulics and Fluid Mechanics in ME
By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is

0.884
0.848
0.392
0.488

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Hydraulics and Fluid Mechanics in ME
The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)

(L.A.N)/60
L.A.N
2 L.A.N
(2 L.A.N)/60

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Hydraulics and Fluid Mechanics in ME
Pitot tube is used for measurement of

velocity
flow
dsscharge
pressure

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MORE MCQ ON Hydraulics and Fluid Mechanics in ME

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