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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
Which of the following instrument can be used for measuring speed of an aeroplane

Venturimeter
Orifice plate
rotameter
pitot tube

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Hydraulics & Fluid Mechanics
Mercury is often used in barometer because

its vapour pressure is so low that it may be neglected
both (B) and (C)
the height of barometer will be less
it is the best liquid

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Hydraulics & Fluid Mechanics
Separation of flow occurs when

the boundary layer comes to rest
the cross-section of a channel is reduced
the pressure intensity reaches a minimum
All of these

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Hydraulics & Fluid Mechanics
Pressure of the order of 10''' torr can be measured by

Micro-manometer
ionisastion gauge
Pirani Gauge
Bourdon tube

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Hydraulics & Fluid Mechanics
The units of viscosity are

newton-sec/metre
kg sec/metre
newton-sec/metre2
metre2/se

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Hydraulics & Fluid Mechanics
The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is (where R is the radius of pipe)

2/3 R
1/2 R
1/3 R
3/4 R

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