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Hydraulics & Fluid Mechanics

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

Bourdon tube
ionisastion gauge
Micro-manometer
Pirani Gauge

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Hydraulics & Fluid Mechanics
A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?

1 : 5
1 :25
1 : 2.5
1:50

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Hydraulics & Fluid Mechanics
At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

minimum
negative value
maximum
could be any value

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Hydraulics & Fluid Mechanics
Two pipe systems are said to be equivalent when

length of pipe and discharge are same in two systems
head loss and discharge are same in two systems
friction factor and length are same in two systems
length and diameter are same in two systems

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Hydraulics & Fluid Mechanics
Free surface of a liquid tends to contract to the smallest possible area due to force of

cohesion
friction
surface tension
viscosity

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Hydraulics & Fluid Mechanics
The region between the separation streamline and the boundary surface of the solid body is known as

drag
lift
wake
boundary layer

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