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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
According to fan laws, for the fans having constant wheel diameters, the power demand varies

Square root of fan speed
Cube of fan speed
Directly as fan speed
Square of fan speed

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Hydraulics and Fluid Mechanics in ME
Cavitation is caused by

weak material
low pressure
high pressure
high velocity

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Hydraulics and Fluid Mechanics in ME
Which type of the pump is different from others in the same group?

Screw pump
Plunger pump
Cam and piston pump
Gear pump

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Hydraulics and Fluid Mechanics in ME
A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039 m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is

40 × 10⁵ kg/cm²
4000 kg/cm²
40 × 10⁶ kg/cm²
400 kg/cm²

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Hydraulics and Fluid Mechanics in ME
When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece)

0.855 a. √2gH
0.707 a. √2gH
0.5 a. √2gH
√2gH

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Hydraulics and Fluid Mechanics in ME
The discharge through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.

0.67 times
0.34 times
0.95 times
0.81 times

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