Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. Specific speed (fps) = k x specific speed (metric where value of k is (for turbines)
a. 8.91
b. 1
c. 4.45
d. 2
e. 9.81
Q. Water at 20? C will rise, in a clean 1 mm dia. Glass tube, a distance, in cm, of
a. 3
b. 5
c. 1
d. 4
e. 2
Q. Viscosity will be the most important property in which of the following case
b. Formation of soap bubbles
c. Water jet issuing from a fire hose
d. Flow of castor oil through a tube
e. Travel of a bullet through air
Q. When the shear stress acting on a fluid is removed
a. the body regains its original shape and position immediately
b. the body regains its original shape and position slowly
c. the body regains its original shape but remains in the new position
d. the body retains its new shape and position
Q. Which mouthpiece is having maximum coefficient of discharge?
a. External mouthpiece
b. Convergent-Divergent mothpiece
c. Internal mouthpiece
d. None of the above
e. None of the above
Q. Drag force is not a function of
a. 1.25
b. projected area of the body
c. velocity of the body
d. mass density of the fluid
e. mass density of the body
Q. The shear stress velocity gradient relation of the Newtonian fluids is
a. There is no such relation
b. Hyperbolic
c. Linear
d. Involutic
e. Parabolic
Q. A hydrometer is used to determine
a. Specific gravity of liquids
b. Buoyancy force
c. Viscosity of liquids
d. Surface tension
e. Relative humidity
Q. Ogee is
a. overfall of a spillway in the shape of double or S-curve which is convex at the top and concave at the bottom
b. the channel between the silt extractor and the river through which the escapage water is discharged
c. the channel conducting water away from a water wheel
d. none of the above
Q. A piece of metal of specific gravity 3.4 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury
a. 0.75
b. Full
c. 0.25
d. 0.5
e. 0.9
Q. An ideal fluid is
a. Frictionless and incompressible
b. One which obeys Newton's law of viscosity
c. Very viscous
d. A useful assumption in problems in conduit flow
e. None of these answers
Q. The parameters with determine the friction factor of turbulent flow in a rough pipe are
a. expands until it fills its space
b. Mach number and relative roughness
c. Reynolds number and relative roughness
d. Froude number and relative roughness
e. Froude number and Mach number
Q. The lowest portion of storage basin from where the water is not drawn usually, is
a. Reserve storage
b. Dead storage
c. Bottom storage
d. Spring reserve
e. Sub-soil storage
Q. If the specific speed of a turbine is 800 the turbine should be
a. Kaplan
b. Pelton wheel
c. Girard
d. Fourneyron
e. Francis