Fluid Mechanics MCQs

Question 1

Surge tanks are provided in high pressure water pipelines to

Accepted Answer

Reduce the water hammer

Answer

Store a definte quantity ofwater all the time

Answer

Facilitate easy dismantling of pipeline for cleaning and maintenance

Answer

None of these

Question 2

Glass pipes can be joined by

Accepted Answer

Bell and spigot joint

Answer

Flanges

Answer

Welding

Answer

Soldering

Question 3

The maximum head that can be developed by a single impeller is __________ ft.

Accepted Answer

250-300

Answer

25

Answer

100

Answer

1000

Question 4

Diaphragm pumps are used to transport

Accepted Answer

Slurries

Answer

Solids

Answer

Liquids

Answer

Fluids

Question 5

Pick out the correct statement pertaining to the flow through a converging-diverging tube.

Accepted Answer

No shock wave develops in the tube when the Mach number at exit is greater than unity

Answer

The value of Mach number is always unity at the throat

Answer

Throughout the converging portion of the tube, the density increases in the downstream direction

Answer

None of these

Question 6

The discharge through a rectangular weir varies as

Accepted Answer

$${{	ext{H}}^{\frac{3}{2}}}$$

Answer

$${{	ext{H}}^{\frac{1}{2}}}$$

Answer

$${{	ext{H}}^{\frac{5}{2}}}$$

Answer

$${{	ext{H}}^{\frac{2}{5}}}$$

Question 7

The boundary layer thickness at a given section along a flat plate __________ with increasing Reynold's number.

Accepted Answer

Decreases

Answer

Increases

Answer

Remains same

Answer

May increase or decrease

Question 8

The line of action of the buoyant force passes through the centre of gravity of the

Accepted Answer

Displaced volume of the fluid

Answer

Submerged body

Answer

Volume of fluid vertically above the body

Answer

Horizontal projection of the body

Question 9

The ratio of the depth of flow to the diameter of the channel for maximum discharge in a circular channel in open channel flow is

Accepted Answer

0.95

Answer

0.1

Answer

0.55

Answer

1.85