Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. Gradually varied flow is
a. None of these answers
b. Unsteady non-uniform flow
c. Steady uniform flow
d. Steady non-uniform flow
e. Unsteady uniform flow
Q. A hydrograph is is a plot of
a. Discharge against time
b. Cumulative run off against time
c. Rainfall intensity against time
d. Cumulative rainfall against time
Q. The shear stress in a turbulent pipe flow
a. Varis parabolically with radius
b. Varis according to the 1/7 the power law
c. 60
d. is zero at the centre and increases as linearly to the wall
e. is zero at the wall and increase linearly to the centre
Q. Which is the correct statement
a. In volute casing the velocity of water decreases but pressure increases
b. In volute casing the velocity of water and also pressure increase
c. Volute casing is improvement over the vortex casing
d. Volute casing provides diffusering
e. None of the above
Q. The motion of air mass in a tornado is
a. free vortex at the centre and forced vortex outside
c. free vortex at the centre as well as outside
d. forced vertex at the centre and free vortex outside
e. forced cortex at the centre as well as outside
Q. The foot valve is provided
a. On suction line
b. On delivery line
c. Both suction and delivery line
d. Neither suction nor delivery lines
e. All of the above
Q. In a flow field, stagnation point is a point where the
b. both pressure and velocity are zero
c. pressure is zero
d. velocity is zero
e. gravitational effect is zero
Q. In a centrifugal pump the pressure energy of water is increased because of
a. Rotation of impeller
b. Centrifugal force
c. Momentum of particles
d. Lift of particles
e. None of the above
Q. In case of forced vortex
a. The fluid rotates with radial as well vertical velocities.
b. Velocity increases with radius
c. The motion of fluid varies at random
d. Velocity decreases with radius
e. The fluid rotates as a composite solid
Q. Select the statement which is correct
a. Local atmospheric pressure is always below standard atmospheric pressure
b. Standard atmospheric pressure is 1 kg/cm2
c. Standard atmospheric pressure is the mean local atmospheric pressure at sea level
d. Local atmospheric pressure depends upon the elevation of the locality only
e. A barometer reads the difference between load and standard atmospheric pressure
Q. A hydraulic jump can occur under all of the following conditions EXCEPT
a. at the foot of the spillways
b. where the gradient suddenly chauges from a steep slope to a flat slope
c. when water moving in shooting flow impacts with water having a larger depth with streaming flow
d. on the upstream side of the sluices
Q. The motion of a fluid in which the fluid mass rotates without the external force is known as
a. Circulatory motion
b. Forced vortex motion
c. Irrotational motion
d. Rotary motion
e. Free vortex motion
Q. In a reaction turbine
a. It is possibel to regulate the flow without loss
b. It must be placed at the foot of the fall and above the tail race
c. Work done is purely by the change in the kinetic energy of the jet
d. Only part of the head is converted into velocity before the water enters the wheel
e. None of the above
Q. A froude number of 2 indicates
a. a weak jump
b. a medium jump
c. a very strong jump
d. a strong jump