Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. Which two forces are most important in laminar flow between closely spaced parallel plates
a. Inertial, viscous
b. Pressure, inertial, inetial
c. Gravity, pressure
d. Viscous, pressure
e. None of the above
Q. The velocity of flow through homogeneous porous media under constant head is
a. directly proportional to the coefficient of permeability
b. inversely proportional to the coefficient of permeability
c. inversely proportional to the square of the coefficient of permeability
d. directly proportional to the square of the coefficient of permeability
Q. It is desired to predict the performance of a large centrifugal pump from that of a scale model one fourth the diameter. The model absorbs 20 HP when pumping under test head of 20 m at its best speed of 400 r.p.m. The large pump is required to pump against 60 m head. The following will be the speed of the pump
a. 173 RPM
b. 153 RPM
c. 208 RPM
d. 100 RPM
e. 167 RPM
Q. The angle of taper on a draft tube is
a. More than 15?
b. Around 10?
c. Less than 7
d. More than 20?
e. Around 15?
Q. To determine the reservoir storage capacity for a given uniform demand, one of the following data is most useful
a. Daily flow-duration curve of the stream at the dam site
b. 1.25
c. Stage discharge relation for the stream at the reservoir site
d. Mass curve of the flow volume for several consecutive years
e. Unit hydrograph of the basin
Q. If the Mach number of a flow is 3 the flow is known as
a. Super-supersonic
b. Supersonic
c. Sonic
d. Sub-sonic
e. None of the above
Q. Select the correct statement regarding frictionless flow
a. The velocity is always sonic at the throat of a converging diverging tube
b. In diverging conduits the velocity always decreases
c. On supersonic flow the area decreases for increasing velocity
d. Sonic velocity cannot be exceeded at the throat of a converging diverging tube
e. Less than 3 m of water
Q. Pascal's law states that pressure at a point is equal in all directions
a. In a liquid at rest
b. In a fluid at rest
c. In a laminar flow
d. In a turbulent flow
e. None of the above
Q. A practical example of steady non-uniform flow is given as the
a. Flow through venturimeter
b. Motion of a river around the pillars of a bridge
c. Constant discharge through straight tapering draft tube turbine
d. Flow through delivery pipe of a reciprocating pump
e. Steadily decreasing flow through a reducing section
Q. If a centrifugal pump takes too much power, the cause may be
a. Air in water
b. Foot valve too small
c. Air leakage
d. Low speed
e. Heavy liquid.
Q. Out ward radial flow turbines
a. Are impulse type
b. Are reaction type
c. Are partly impulse partly reaction
d. May be impulse or reaction type
e. None of the above
Q. The statement "For laminar flow through a fine porous bed or capillary passages in a solid, the velocity based on the total cross-section is proportional to the ratio of pressure gradient to viscosity" is known as
a. Schmidt's law
b. Fick's law
c. Reynolds hypothesis
d. Stock's law
e. Darcy's law of permeability
Q. Cavitation is caused by
a. Low velocity
b. Low pressure
c. High velocity
d. Low barometric pressure
e. High pressure
Q. The thickness of turbulent boundary layer at a distance x from the leading edge over a flat plate varies as
a. x1/2
b. x5/3
c. x5/4
d. x4/5
e. x3/5
Q. In Hagen-poiseuille flow of viscous liquid, one of the following pairs of forces strike a balance
a. Pressure and viscous forces
b. Inertia and gravity forces
c. 3
d. Gravity and viscous forces
e. Inertia and viscous forces