Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. Which of the following is an example of free vortex flow?
a. A whirlpool in a river
b. Flow of liquid through a hole provided at the bottom of a container
c. Flow of liquid around a circular bend in a pipe.
d. All of the above.
Q. In case of forced vortex, the rise of liquid level at the ends is .... the fall of liquid level at the axis of rotation.
a. Less than
b. More than
c. Equal to
d. None of the above
Q. In case of a closed cylindrical vessel sealed at the top and the bottom the volume of air before rotation is ...... the volume of air after:
a. More than
b. Less than
c. Equal to
d. None of the above
Q. Dimensional analysis is used to
a. Test the dimensional homogeneity of any equation of fluid motion
b. Derive rational formulae for a flow phenomenon
c. Derive equations expressed in terms of non– dimensional parameters
d. All of the above.
Q. Which of the following is an advantage of dimensional analysis?
a. It expresses the functional relationship between the variables in dimensionless terms
b. In hydraulic model studies it reduces the number of variables involved in a physical phenomenon, generally by three
c. By the use of dimensional analysis design curves can be developed from experimental data or direct solution of the problem
d. All of the above.
Q. dimensionally homogeneous equation is applicable to
a. C.G.S. system only
b. F.P.S. system only
c. M.K.S. and SI systems
d. All systems of units.
Q. In order that results obtained in model studies correctly represent the behaviour of the prototype, which of the following similarities must be ensured between the model and the prototype?
a. Geometric similarity
b. Kinematic similarity
c. Dynamic similarity
d. All of the above.
Q. Dynamic similarity between the model and prototype is the
a. Similarity of motion
b. Similarity of lengths
c. Similarity of forces
d. None of the above.
Q. ...... is equal to the product of shear stress due to viscosity and surface area of flow.
a. Viscous force
b. Inertia force
c. Pressure force
d. Gravity force.
Q. Kinematic similarity between model and prototype is the
a. Similarity of discharge
b. Similarity of shape
c. Similarity of streamline pattern
d. None of the above.
Q. ......... is the ratio of the inertia force to the viscous force.
a. Froude’s number
b. Weber’s number
c. Reynolds number
d. Mach’s number.
Q. ........ is the square root of the ratio of the inertia force to the pressure force.
a. Reynolds number
b. Mach’s number
c. Euler’s number
d. Froude’s number.
Q. Euler number is important in which of the following flow situations?
a. Discharge through orifices, mouthpieces and sluices
b. Pressure rise due to sudden closure of valves
c. Flow through pipes
d. All of the above
Q. Mach’s number is defined as the square root of the ratio of the
a. Inertia force to the pressure force
b. Inertia force to the surface tension force
c. Inertia force to the elastic force
d. None of the above.
Q. ...... is important in compressible fluid flow problems at high velocities, such as high velocity flow in pipes or motion of high-speed projectiles and missiles.
a. Euler’s number
b. Mach’s number
c. Reynolds number
d. Froude’s number.