FLUID MECHANICS QUIZ

A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now

Remain same

Data insufficient to predict

Increase

Decrease

TRUE ANSWER : ?
YOUR ANSWER : ?

The Prandtl mixing length is

Independent of radial distance from the pipe axis

Independent of the shear stress

Zero at the pipe wall and is a universal constant

Useful for computing laminar flow problems

TRUE ANSWER : ?
YOUR ANSWER : ?

Scale up of agitator design requires

Geometrical similarity only

Both geometrical and dynamic similarity

All of these

Dynamic similarity only

TRUE ANSWER : ?
YOUR ANSWER : ?

In frictional fluid flow, the quantity, P/ρ + V²/2gc + gz/gc, is

Not constant along a streamline

Constant along a streamline

Increased in the direction of flow

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Slurries can be most conveniently pumped by a __________ pump.

Screw

Centrifugal

Gear

Reciprocating

TRUE ANSWER : ?
YOUR ANSWER : ?

The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the __________ length.

Equivalent

Transition

Prandtl mixing

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Momentum transfer in laminar flow of fluids results due to the

Velocity gradient

Density

None of these

Viscosity

TRUE ANSWER : ?
YOUR ANSWER : ?

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

HW/4(H + W)²

√(HW/π)

HW/2(H + W)²

2HW/(H + W)²

TRUE ANSWER : ?
YOUR ANSWER : ?

Steady uniform flow is represented by flow through a/an

Long pipe at constant rate

Expanding tube at constant rate

None of these

Long pipe at decreasing rate

TRUE ANSWER : ?
YOUR ANSWER : ?

Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the

Flow of liquid during operation of the pump

All of these

Back flow of fluid in the event of stoppage of pump

Discharge pressure

TRUE ANSWER : ?
YOUR ANSWER : ?

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