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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of

0.8
1.2
0.75
1

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Hydraulics and Fluid Mechanics in ME
The efficiency of a hydraulic press is given by (where W = Weight lifted by ram, P = Force applied on plunger, A = Area of ram, and a = Area of plunger)

(p/W) × (a/A)
(p/W) × (A/a)
(W/p) × (A/a)
(W/p) × (a/A)

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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
Power required to drive a centrifugal pump is directly proportional to _________ of its impeller.

Square of diameter
Fourth power of diameter
Diameter
Cube of diameter

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Hydraulics and Fluid Mechanics in ME
The wake

always occurs after a separation point
is a region of high pressure intensity
always occurs before a separation point
None of these

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Hydraulics and Fluid Mechanics in ME
In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be

Sixteen times
Double
Eight times
Four times

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