241. In a fluidised bed reactor
Temperature gradients are very high
Temperature is more or less uniform
Hot spots are formed
Segregation of the solids occurs
✅ The correct answer is option B.
Fluid Mechanics MCQs
242. What causes cavitation in centrifugal pump?
High suction pressure
Low barometric pressure
Low suction pressure
High suction velocity
✅ The correct answer is option C.
243. The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke’s law range is proportional to the
Inverse of fluid viscosity
Square of particle size
Difference in the densities of the particle & fluid
All of the above
✅ The correct answer is option D.
245. In laminar flow through a round tube, the discharge varies
Linearly as the viscosity
Inversely as the pressure drop
Inversely as the viscosity
As the square of the radius
✅ The correct answer is option C.
246. In the Newton’s law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is __________ the fluid viscosity.
Directly proportional to
Inversely proportional to
Inversely proportional to the square root of
Independent of
✅ The correct answer is option B.
247. The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is
< 1
1
> 1
2
✅ The correct answer is option A.
248. Equivalent length of a pipe fitting is
Dependent on Reynolds number
Independent of Reynolds number
Dependent on the length of the pipe
None of these
✅ The correct answer is option A.
249. For steady ideal fluid flow, the Bernoulli’s equation states that the
Velocity is constant along a stream line
Energy is constant throughout the fluid
Energy is constant along a stream line, but may vary across stream lines
None of these
✅ The correct answer is option C.
250. The ratio of maximum to average velocity in case of streamline flow between parallel plates is
1
1.5
2
2.5
✅ The correct answer is option B.