Fluid Mechanics MCQs

Question 1

Steady non-uniform flow is exemplified by flow through a/an

Accepted Answer

Expanding tube at constant rate

Answer

Long pipe at constant rate

Answer

Long pipe at decreasing rate

Answer

Expanding tube at increasing rate

Question 2

Pressure drop in packed bed for turbulent flow is given by the __________ equation.

Accepted Answer

Blake-Plummer

Answer

Kozney-Karman

Answer

Leva's

Answer

Hagen-Poiseulle's

Question 3

Pressure drop in a packed bed for laminar flow is given by the __________ equation.

Accepted Answer

Kozney-Karman

Answer

Blake-Plummer

Answer

Leva's

Answer

Fanning friction factor

Question 4

Creeping flow around a sphere is defined, when particle Reynolds number is

Accepted Answer

< 0.1

Answer

< 2100

Answer

> 2.5

Answer

< 500

Question 5

Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds

Accepted Answer

2100

Answer

4000

Answer

1500

Answer

3000

Question 6

Specific speed of a centrifugal pump depends upon the __________ head.

Accepted Answer

None of these

Answer

Suction

Answer

Delivery

Answer

Manometric

Question 7

The energy equation, $${	ext{E}} + \frac{{	ext{P}}}{ho } + \frac{{{{	ext{V}}^2}}}{{2{	ext{g}}}} + {	ext{gZ}} = {	ext{constant}}$$ (E = internal energy/mass), is applicable to

Accepted Answer

All of the above

Answer

Perfect gases only

Answer

Isothermal flow of gases

Answer

Adiabatic unsteady flow of gases

Question 8

The dimension of dynamic viscosity is

Accepted Answer

ML-1T-1

Answer

L2T-1

Answer

LT-2

Answer

ML-1T-2

Question 9

Pick out the correct statement pertaining to transition/ entrance length in fluid flow.

Accepted Answer

All of the above

Answer

The length of entrance region of pipe, in which full development of fluid flow takes place such that velocity profile does not change downstream, is called the transition length

Answer

Transition length for laminar flow of Newtonion fluids in a pipe of diameter 'd' is equal to 0.05. D.NRe

Answer

Transition length for turbulent flow of Newtonion fluids in a smooth pipe of diameter 'd' is equal to 50 D