Top 1000+ Solved Fluid Mechanics (FM) MCQ Questions Answer
Q. Discharge of a centrifugal pump is (where N= speed of the pump impeller)
a. directly proportional to n
b. inversely proportional to n
c. directly proportional to n2
d. inversely proportional to n2
Q. For a centrifugal pump impeller, the maximum value of the vane exit angle is
a. 10o to 15o
b. 15o to 20o
c. 20o to 25o
d. 25o to 30o
Q. The velocity corresponding to Reynold number of 2000 is called
a. Sub-sonic velocity
b. Super-sonic velocity
c. Lower critical velocity
d. Higher critical velocity
Q. The loss of head at entrance in a pipe is (where v = Velocity of liquid in the pipe)
a. v²/2g
b. 0.5v²/2g
c. 0.375v²/2g
d. 0.75v²/2g
Q. Which of the following is an example of laminar flow?
a. Underground flow
b. Flow past tiny bodies
c. Flow of oil in measuring instruments
d. All of these
Q. The efficiency of power transmission through pipe is (where H = Total supply head, and hf = Headlost due to friction in the pipe)
a. (H - hf )/H
b. H/(H - hf )
c. (H + hf )/H
d. H/(H + hf )
Q. The hydraulic mean depth or the hydraulic radius is the ratio of
a. Area of flow and wetted perimeter
b. Wetted perimeter and diameter of pipe
c. Velocity of flow and area of flow
d. None of these
Q. A flow in which each liquid particle has a definite path, and the paths of individual particles donot cross each other, is called
a. Steady flow
b. Uniform flow
c. Streamline flow
d. Turbulent flow
Q. The Reynold's number of a ship is __________ to its velocity and length.
a. Directly proportional
b. Inversely proportional
c. Square root of velocity
d. None of these
Q. The velocity at which the laminar flow stops, is known as
a. Velocity of approach
b. Lower critical velocity
c. Higher critical velocity
d. None of these
Q. The velocity corresponding to Reynold number of 2800, is called
a. Sub-sonic velocity
b. Super-sonic velocity
c. Lower critical velocity
d. Higher critical velocity
Q. The total energy of a liquid particle in motion is equal to
a. Pressure energy + kinetic energy + potential energy
b. Pressure energy - (kinetic energy + potential energy)
c. Potential energy - (pressure energy + kinetic energy
d. Kinetic energy - (pressure energy + potential energy)
Q. A flow in which the viscosity of fluid is dominating over the inertia force is called
a. Steady flow
b. Unsteady flow
c. Laminar flow
d. Turbulent flow