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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The number of buckets on the periphery of a Pelton wheel is given by

(D/2d) + 5
(D/2d) + 20
(D/2d) + 15
(D/2d) + 10

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Hydraulics and Fluid Mechanics in ME
The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)

μπ²NR/60t
μπ²NR⁴/60t
μπ²NR³/60t
μπ²NR²/60t

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Hydraulics and Fluid Mechanics in ME
The factional resistance of a pipe varies approximately with __________ of the liquid.

Cube of velocity
Velocity
Pressure
Square of velocity

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Hydraulics and Fluid Mechanics in ME
The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the submerged body is called

Reaction
Up-thrust
Buoyancy
Metacentre

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Hydraulics and Fluid Mechanics in ME
The viscosity of a gas

decreases with increase in temperature
is independent of pressure for very high pressure intensities
increases with increase in temperature
is independent of temperature

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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)

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

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