WINDOWS NT QUIZ

The Mach number for hypersonic flow of compressible fluid is

< 2

> 1

> 4

1

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As per Newton's law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to(where, μ = fluid viscosity)

μ²

1/μ

1/μ²

μ

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In Newton's law range, the drag co-efficient for the motion of spherical particle in a stationary fluid is

0.44

4.4

44

0.044

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Water is flowing at 1 m/sec through a pipe (of 10 cm I.D) with a right angle bend. The force in Newtons exerted on the bend by water is

5π/√2

5π/2

5√2π

10√2π

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The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is

HW/2(H + W)²

2HW/(H + W)²

HW/4(H + W)²

√(HW/π)

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The most economical flow control valve for use with large diameter pipes is a

Butterfly valve

Globe valve

None of these

Needle valve

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In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant?

Unsteady

Non-uniform

Rotational

Turbulent

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Priming of a centrifugal pump is done to

Develop effective pressure rise by the pump

Avoid chances of separation inside the impeller

None of these

Increase the mass flow rate of fluid

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Foot valves are provided in the suction line of a centrifugal pump to

Control the liquid discharge

Avoid priming, every time we start the pump

Minimise the fluctuation in discharge

Remove the contaminant present in the liquid

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Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an

Orificemeter

Rotameter

Venturimeter

Pitot tube

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