Fluid Mechanics MCQs

Question 1

Cd for the orifice plate varies from

Accepted Answer

0.58 to 0.8

Answer

0.93 to 0.98

Answer

0.2 to 0.3

Answer

0.02 to 0.03

Question 2

Mach number is the ratio of the speed of the

Accepted Answer

Fluid to that of the sound

Answer

Fluid to that of the light

Answer

Light to that of the fluid

Answer

Sound to that of the fluid

Question 3

Which of the following valves will incur maximum pressure drop for the same discharge of water?

Accepted Answer

Needle valve

Answer

Globe valve

Answer

Gate valve

Answer

Butterfly valve

Question 4

If more than two branches of pipes are to be connected at the same point, then use a/an

Accepted Answer

Tee

Answer

Elbow

Answer

Union

Answer

None of these

Question 5

Which law is followed by the velocity distribution in the turbulent boundary layer?

Accepted Answer

Logarithmic law

Answer

Parabolic law

Answer

Linear law

Answer

None of these

Question 6

With increase in temperature, the vapor pressure of liquids

Accepted Answer

Increases

Answer

Increases linearly

Answer

Decreases

Answer

Remains constant

Question 7

Kinetic energy of fluid per unit weight represented by the velocity head is given by

Accepted Answer

$$\frac{{{{	ext{v}}^2}}}{{2{{	ext{g}}_{	ext{c}}}}}$$

Answer

$$\frac{{2{{	ext{v}}^2}}}{{{{	ext{g}}_{	ext{c}}}}}$$

Answer

$$\frac{{ho \cdot {{	ext{v}}^2}}}{{{{	ext{g}}_{	ext{c}}}}}$$

Answer

$$\frac{{ho \cdot {{	ext{v}}^2}}}{{2{{	ext{g}}_{	ext{c}}}}}$$

Question 8

A bed consists of particles of density 2000 kg/m3. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is

Accepted Answer

11.77 kPa

Answer

25.61 kPa

Answer

14.86 kPa

Answer

21.13 kPa

Question 9

Which of the following is most prone to pulsating discharge flow ?

Accepted Answer

Reciprocating pump

Answer

Centrifugal pump

Answer

Gear pump

Answer

Axial flow pump