Gate
Butterfly
Needle
Globe
✅ The correct answer is option B.
Fluid Mechanics MCQs
Which of the following equations applies to the fluid flow through a packed bed for very large Reynolds number?
Fanning equation
Blake-Pllummer equation
Hagen-Poiseulle equation
Kozney-Karman equation
✅ The correct answer is option B.
What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe)?
0.5
1
1.5
2
✅ The correct answer is option D.
The discharge through a rectangular weir varies as
H1/2
H5/2
H2/5
H3/2
✅ The correct answer is option D.
Friction produced by the formation of wakes is called the __________ friction.
Disk
Skin
Form
None of these
✅ The correct answer is option C.
The unit of dynamic viscosity in SI unit is
kg/m . sec
N/m²
m² /sec
m/N. sec
✅ The correct answer is option A.
What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water iterface? The balloon is of radius 0.1 m and is filled with air.
4πg/3
0.01πgH/4
0.01πgH/8
0.04πgH/3
✅ The correct answer is option A.
The continuity equation
Relates mass flow rate along a stream tube
Relates work and energy
Stipulates that Newton’s second law of motion must be satisfied at every point in the fluid
None of these
✅ The correct answer is option A.
Net positive suction head (NPSH) of a centrifugal pump must be
Greater than the vapour pressure of the liquid
Less than the vapour pressure of the liquid
Equal to the vapour pressure of the liquid
Less than barometric pressure
✅ The correct answer is option A.
In deriving Bernoulli’s equation, fluid is assumed to be
Incompressible, frictionless, steady, along a streamline
Uniform, steady, incompressible, along a streamline
Steady, density being pressure dependent, frictionless
None of these
✅ The correct answer is option A.