Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. Distorted models are required to be prepared for which of the following?
a. Rivers
b. Dams across very wide rivers
c. Harbours
d. All of the above.
Q. The scale effect in models can be
a. Positive only
b. Negative only
c. Both positive and negative
d. None of the above.
Q. The laminar/viscous flow is characterized by Reynolds number which is
a. less than the critical value
b. Equal to critical value
c. More than critical value
d. None of the above.
Q. The laminar flow is characterized by
a. Existence of eddies
b. Irregular motion of fluid particles
c. Fluid particles moving in layers parallel to the boundary surface
d. None of the above.
Q. In case of laminar flow, the loss of pressure head is proportional to
a. Velocity
b. Velocity2
c. Velocity3
d. None of the above.
Q. The pressure gradient in the direction of flow is equal to the shear gradient in the direction
a. Parallel to the direction of flow
b. Normal to the direction of flow
c. Either of the above
d. None of the above.
Q. …... studied the laminar flow through a circular tube experimentally
a. Prandtl
b. Pascal
c. Hagen and Poiseuille
d. None of the above.
Q. …... is the most commonly used equation for the velocity distribution for laminar flow through pipes.
a. u = umax [1 – (r/R)]
b. u = umax [1- (r/R)2]
c. u = umax [1 – (r/R)3]
d. u = u2max [1 – (r/R)2]
Q. For viscous flow the co-efficient of friction is given by
a. f = 8/Re
b. f = 16/Re
c. f = 32/Re
d. f = 60/Re.
Q. The maximum velocity in a circular pipe when flow is laminar occurs at
a. The top of the pipe
b. The bottom of the pipe
c. The centre of the pipe
d. Not necessarily at the centre.
Q. The flow is said to be turbulent when Reynolds number is
a. Less than 1000
b. Equal to 2000
c. Greater than 4000
d. Between 1000 to 4000.
Q. The shear in turbulent flow is mainly due to
a. Heat transfer
b. Mass transfer
c. Momentum transfer
d. All of the above.
Q. Which of the following statements is correct? Wall turbulence occurs
a. In immediate vicinity of solid surfaces and in the boundary layer flows where the fluid has a negligible mean acceleration
b. In jets, wakes, mixing layer etc.
c. Where there is conversion of potential energy into kinetic energy by the process of mixing
d. None of the above.