FLUID MECHANICS QUIZ

A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m³/s? The Fanning friction factor, f is 0.0062.

12 m

11 m

20 m

10 m

TRUE ANSWER : ?
YOUR ANSWER : ?

If the head over the triangular notch is doubled, the discharge will increase by __________ times.

4

2.828

5.657

2

TRUE ANSWER : ?
YOUR ANSWER : ?

The hydrodynamic and thermal boundary layers will merge, when

Archimedes number is greater than 10000

Nusselt number tends to infinity

Prandtl number is one

Schmidt number tends to infinity

TRUE ANSWER : ?
YOUR ANSWER : ?

Unsteady non-uniform flow is represented by flow through a/an

Expanding tube at increasing rate

Long pipe at constant rate

Expanding tube at constant rate

Long pipe at decreasing rate

TRUE ANSWER : ?
YOUR ANSWER : ?

The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is

< 1

2

1

> 1

TRUE ANSWER : ?
YOUR ANSWER : ?

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

TRUE ANSWER : ?
YOUR ANSWER : ?

Euler's equation of motion is a statement expressing

Conservation of energy

Newton's first law of motion

Conservation of mass

Newton's second law of motion

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YOUR ANSWER : ?

Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg.

0.1

1

0.001

0.01

TRUE ANSWER : ?
YOUR ANSWER : ?

While starting an axial flow pump, its delivery valve should be kept

Either open or closed

Closed

None of these

Open

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YOUR ANSWER : ?

Cd is always __________ Cc.

Less than

Equal to

Either more or less than

Greater than

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YOUR ANSWER : ?

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