Fluid Mechanics MCQs

Question 1

In case of coutte flow, the fluid flow is between two large flat parallel plates with

Accepted Answer

Top plate moving and the bottom plate fixed

Answer

Bottom plate moving and the top plate fixed

Answer

Both the plates fixed

Answer

Both the plates moving

Question 2

Capacity of a rotary gear pump can be varied by

Accepted Answer

All of the above

Answer

Changing the speed of rotation

Answer

Bleeding air into suction

Answer

Bypassing liquid from the suction or discharge line

Question 3

The capillary rise of mercury is maximum in glass tube of dia __________ mm.

Accepted Answer

0.5

Answer

1

Answer

2

Answer

5

Question 4

The pitot static tube does not measure the __________ pressure.

Accepted Answer

All of the above

Answer

Static

Answer

Total

Answer

Difference in static & dynamic

Question 5

Manometers measure the __________ pressure.

Accepted Answer

Difference in

Answer

Vacuum as well as the atmospheric

Answer

Absolute

Answer

Gage

Question 6

Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be __________ ft.

Accepted Answer

8

Answer

40

Answer

34

Answer

37

Question 7

At high Reynolds number

Accepted Answer

Inertial forces control and viscous forces are unimportant

Answer

Viscous forces predominate

Answer

Inertial forces are unimportant and viscous forces control

Answer

None of these

Question 8

At low Reynolds number

Accepted Answer

Viscous forces control and inertial forces are unimportant

Answer

Viscous forces are unimportant

Answer

Viscous forces control

Answer

Gravity forces control

Question 9

Viscosity of water is about __________ times that of air at room temperature.

Accepted Answer

55

Answer

15

Answer

155

Answer

1050