Hydraulics and Fluid Mechanics - Mechanical Engineering Questions and Answers

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The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by

dQ/Q = (1/2) × (dH/H)

dQ/Q = (3/4) × (dH/H)

dQ/Q = (dH/H)

dQ/Q = (3/2) × (dH/H)

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According to Bernoulli's equation

Z + p/w + v²/2g = constant

Z + p/w - v²/2g = constant

Z - p/w + v²/2g = constant

Z - p/w - v²/2g = constant

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Which of the following instruments is used to measure flow on the application of Bernoulli's theorem?

Venturimeter

Orifice plate

Nozzle

All of the above

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Ratio of inertia force to surface Jension is known as

Mach number

Froude number

Reynolds’s number

Weber’s number

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The ratio of absolute viscosity to mass density is known as

Specific viscosity

Viscosity index

Kinematic viscosity

Coefficient of viscosity

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The velocity at which the flow changes from laminar flow to turbulent flow is called

Critical velocity

Velocity of approach

Sub-sonic velocity

Super-sonic velocity

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Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance)

Cc × Cv

Cc × Cr

Cv × Cr

Cc/Cr

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An average value of coefficient of velocity is

0.62

0.76

0.84

0.97

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A flow through an expanding tube at constant rate is called

Steady uniform flow

Steady non-uniform flow

Unsteady uniform flow

Unsteady non-uniform flow