Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. Which of the following forces do not act on fluids
a. Gravity
b. Viscous force
c. Torsion
d. Inertia
e. Pressure
Q. In a centrifugal pump casing, the flow of water leaving the impeller is
a. Radial flow
b. Forced vortex motion
c. Centrifugal flow
d. Free vortex motion
e. Rectilinear flow
Q. Fresh water 2 m deep flows over the top of 4 m of salt water (S = 1.04). The pressure at the bottom, in kPa, is
a. 60.4
b. 58.8
c. 55.2
d. 51.3
e. 47.9
Q. Hydraulic jump is used for
a. Reducing the velocity of flow
b. Reducing the energy of flow
c. Increasing the flow rate
d. Reducing the flow rate
e. Reducing turbulence
Q. When the rheogram for a fluid at any temperature and pressure is a straight line passing through origin, the fluid is said to be
b. Newtonian
c. Non-Newtonian
d. Bingham
e. Ideal plastic
Q. The miaimum thickness of boundary layer in a pipe of radius R is
a. 0.22 R
b. R
c. 0.5 R
d. 0.1 R
Q. The hydrostatic law states that rate of increase of pressure in a vertical direction is equal to
a. Density of the fluid
b. Specific weight of the fluid
c. Weight of the fluid
d. None of the above
e. Is practically incompressible
Q. In open channels, under critical flow conditions, the velocity head is equal to
a. one-fourth the depth of flow
b. the depth of flow
c. two-thirds of the depth of flow
d. half the depth of flow
Q. Which of the following pumping device for supplying water to boiler does not have moving parts?
a. Multistage centrifugal pump
b. Duplex pump
c. Simplex pump
d. Single stage centrifugal pump
e. Steam injector
Q. Which one of the following is laminar flow
a. Rise of water in plants through roots
b. Movement of blood in the arteries of a human body
c. Flow of oil in measuring instruments
d. All of the above
e. None of the above
Q. A simple pitot tube is used to measure
a. The total pressure
b. The undistributed fluid pressure
c. The pressure in a static fluid
d. The velocity in a flowing stream
e. The dynamic pressure
Q. The wake
a. Always occurs after a separation point
b. Is the principal cause of skin friction
c. Always occurs when deformation drag predominates
d. Is none of these answers
e. Is a region of high pressure
Q. For safety against overturning in a gravity dam, the resultant of all the forces acting on a dam must pass
a. Middle third of the base
b. Outside the base
c. Just at extreme edge of the base
d. First third of the base
e. Within 10% of the extreme edge
Q. A current meter is used for the measurement of
a. Electrical charge on fluids
b. Velocity
c. Electrical conductivity
d. Pressure
e. Viscosity
Q. Rocks that undergo notable expansion without flow due to preence of clay minerals, are known as
a. Swelling rocks
b. Moderately jointed rocks
c. Seamy rocks
d. Schistos rocks
e. Squeezing rocks