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Hydraulics & Fluid Mechanics

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

pitot tube
Orifice plate
Venturimeter
rotameter

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Hydraulics & Fluid Mechanics
Surface energy per unit area of a surface is numerically equal to

atmospheric pressure
force of cohesion
surface tension
force of adhesion

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Hydraulics & Fluid Mechanics
An object having 10 kg mass weighs 9.81kg on a spring balance. The value of ‘g’ at this place is

10.2/m sec
9.81 m/sec²
10m/sec²
9.75 m/sec²

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Hydraulics & Fluid Mechanics
A perfect gas

None of these
is incompressible
has constant viscosity
is of theoretical interest

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

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

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Hydraulics & Fluid Mechanics
In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is

50 M/SEC
40 M/SEC
33 M/SEC
22.5 M/SEC

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