Fluid Mechanics MCQs

Question 1

The continuity equation

Accepted Answer

Represents the conservation of mass

Answer

Is independent of the compressibility of the fluid

Answer

Is dependent upon the viscosity of the fluid

Answer

None of these

Question 2

The friction factor is

Accepted Answer

None of these

Answer

Always inversely proportional to the Reynolds number

Answer

Not dimensionless

Answer

Not dependent on the roughness of the pipe

Question 3

The lift of a ballon is

Accepted Answer

Due to the weight of the atmospheric air, that it displaces

Answer

Increased, as it rises to a higher altitude

Answer

Not dependent on the temperature of the atmosphere

Answer

None of these

Question 4

The blades of a centrifugal impeller are said to be curved forward, if the __________ of the motion of impeller blades.

Accepted Answer

Outlet tip of a blade is towards the direction

Answer

Inlet tip of a blade curves in a direction opposite to that

Answer

Outlet tip of a blade curves in a direction opposite to that

Answer

Inlet tip of a blade is towards the direction

Question 5

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

Accepted Answer

Decrease

Answer

Increase

Answer

Remain same

Answer

Data insufficient to predict

Question 6

The Prandtl mixing length is

Accepted Answer

Useful for computing laminar flow problems

Answer

Zero at the pipe wall and is a universal constant

Answer

Independent of radial distance from the pipe axis

Answer

Independent of the shear stress

Question 7

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

Accepted Answer

Back flow of fluid in the event of stoppage of pump

Answer

Discharge pressure

Answer

Flow of liquid during operation of the pump

Answer

All of the above

Question 8

The unit of velocity head is

Accepted Answer

ft-lbf/lb

Answer

ft-lb/sec

Answer

ft-lb/ft3

Answer

ft-lbf/sec

Question 9

Which of the following exemplifies a three dimensional fluid flow ?

Accepted Answer

Fluid flow at the inlet to a nozzle

Answer

Fluid flow between parallel plates

Answer

Viscous fluid flow between converging plates

Answer

None of these