11. Which of the following flow measuring devices is an area meter?
Venturimeter
Orifice meter
Anemometer
Rotameter
✅ The correct answer is option D.
Fluid Mechanics MCQs
12. In power law, ζ = A (du/dy)² + B , then the fluid is
Newtonian
Dilatant
Thixotropic
Rheopectic
✅ The correct answer is option A.
13. Pick out the wrong statement pertaining to fluid flow.
The ratio of average velocity to the maximum velocity for turbulent flow of Newtonion fluid in circular pipes is 0.5
The Newtonion fluid velocity in a circular pipe flow is maximum at the centre of the pipe
Navier-Stokes equation is applicable to the analysis of viscous flows
Hagen-Poiseuille equation is applicable to the laminar flow of Newtonion fluids
✅ The correct answer is option A.
14. One dimensional fluid flow implies the
Flow in straight lines only
Uniform flow
Steady uniform flow
Flow in which transverse components are zero
✅ The correct answer is option D.
15. In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the __________ efficiency.
Manometric
Mechanical
Volumetric
Overall
✅ The correct answer is option A.
16. With increase in temperature, the vapor pressure of liquids
Increases
Increases linearly
Decreases
Remains constant
✅ The correct answer is option A.
17. Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe.
Smaller than
Larger than
Same as
Twice
✅ The correct answer is option A.
18. Uniform fluid flow occurs, when the derivative of the flow variables satisfy the following condition.
∂/∂t = 0
∂/∂t = constant
∂/∂s = 0
∂/∂t = constant
✅ The correct answer is option C.
19. Foot valves are provided in the suction line of a centrifugal pump to
Avoid priming, every time we start the pump
Remove the contaminant present in the liquid
Minimise the fluctuation in discharge
Control the liquid discharge
✅ The correct answer is option A.
20. For the same terminal conditions and fitting size, the least friction loss is incurred in a/an
T-joint
Union
45° elbow
90°bend
✅ The correct answer is option B.