Fluid Mechanics MCQs

Question 1

The ratio of actual discharge to theoretical discharge through an orifice is equal to

Accepted Answer

Cc.Cv

Answer

Cc.Cd

Answer

Cv.Cd

Answer

$$\frac{{{{	ext{C}}_{	ext{d}}}}}{{{{	ext{C}}_{	ext{v}}}}}$$

Question 2

A differential pressure cell is used for

Accepted Answer

Remote recording of pressure difference

Answer

Measuring small pressure difference in gases

Answer

Measuring small pressure difference in liquids

Answer

Measuring the difference of the impact & the static pressure

Question 3

In Newton's law range, the drag co-efficient for the motion of spherical particle in a stationary fluid is

Accepted Answer

0.44

Answer

0.044

Answer

4.4

Answer

44

Question 4

Volume of liquid displaced by a floating body is equivalent to its

Accepted Answer

Own weight

Answer

Submerged weight

Answer

Own volume

Answer

Submerged volume

Question 5

Euler's equation of motion is a statement expressing

Accepted Answer

Conservation of mass

Answer

Conservation of energy

Answer

Newton's first law of motion

Answer

Newton's second law of motion

Question 6

Steady fluid flow occurs, when the derivative of flow variables satisfy the following condition.

Accepted Answer

$$\frac{\partial }{{\partial {	ext{t}}}} = 0$$

Answer

$$\frac{\partial }{{\partial {	ext{s}}}} = 0$$

Answer

$$\frac{\partial }{{\partial {	ext{s}}}} = {	ext{constant}}$$

Answer

$$\frac{\partial }{{\partial {	ext{t}}}} = {	ext{constant}}$$

Question 7

Uniform fluid flow occurs, when the derivative of the flow variables satisfy the following condition.

Accepted Answer

$$\frac{\partial }{{\partial {	ext{s}}}} = 0$$

Answer

$$\frac{\partial }{{\partial {	ext{t}}}} = 0$$

Answer

$$\frac{\partial }{{\partial {	ext{t}}}} = {	ext{constant}}$$

Answer

$$\frac{\partial }{{\partial {	ext{s}}}} = {	ext{constant}}$$

Question 8

In frictional fluid flow, the quantity, $$\frac{{	ext{P}}}{ho } + \frac{{{{	ext{V}}^2}}}{{2{	ext{gc}}}} + \frac{{{	ext{gz}}}}{{{	ext{gc}}}},$$ is

Accepted Answer

Not constant along a streamline

Answer

Constant along a streamline

Answer

Increased in the direction of flow

Answer

None of these

Question 9

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

Accepted Answer

0.01

Answer

1

Answer

0.1

Answer

0.001