Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. The ratio inertia forces/surface tension force gives a non-dimensional number known as
a. Cauchy number
b. Euler number
c. Shround number
d. Weber number
e. Froude number
Q. Highest value of sliding factor may be expected in case of
a. Concrete on gravel
b. Concrete on fine gravel
c. Concrete on sand
d. Concrete on rock
e. Concrete on clayey soil
Q. An ideal flow of any liquid must fulfil
a. Newton's second law of motion
b. Countinuity equation
c. Law of conservation of energy
d. Bernulli's theorem
e. The Newton's law of viscosity
Q. A right circular cylinder open at the top is filled with liquid (specific gravity 1.2) and rotated about its vertical axis at such speed that half the liquid spills out. The pressure at centre of the bottom is
a. One eighth of its value when cylinder was full
b. Same as before rotation
c. One fourth of its value when cylinder was full
d. Zero
e. Half of its value when cylinder was full
Q. The result of pressure of a liquid on the wetted surface of a rigid body is
a. The single force which, acting at a point on that surface would produce the same effect on the body as the liquid pressure on it
b. The single resultant force acting on the body
c. The point where vertical component of resulting force is zero
d. The single point where resultant horizontal force is zero
e. None of the above
Q. Prandtl's mixing length hypothesis is based on
a. eddy viscosity
b. momentum exchange that occurs due to random motion
c. similarity of turbulent flow pattern
d. None of the above
Q. The value of n in Manning's formula for flow through channel is expected to be least in case of
a. Glass surfaces
b. Unfinished cement surface
c. Cement concrete finish
d. Corrugated metals surface
e. Vitrified clay.
Q. The coefficient of discharge (Cd) of an orifice varies with
a. Reynold number
b. Weber number
c. Froude number
d. None of the above
Q. In a mixed flow turbine water enters
a. axially and leaves radially
b. radially and leaves axially
c. tangentially and leaves axially
d. tangentially and leaves radially
Q. A bulb turbine is a
a. high head high rpm turbine
c. high head turbine
d. medium head turbine
e. low head turbine
Q. For a given bed, roughness and discharge when the wetted perimeter is minimum, the which of the following is also minimum?
a. hydraulic radius
b. discharge
c. cross-sectional area.
d. velocity
Q. An imaginary line drawn through a flow field such that the tangent at any point gives the velocity vector at an instant is known as
a. path line
b. streak line
c. steam line
d. either of the above
Q. Total drag on a body is the sum of
a. friction drag and pressure drag
b. pressure drag, velocity drag and friction drag
c. 28
d. friction drag and velocity drag
e. pressure drag and velocity drag
Q. Separation is caused by
a. an adverse pressure gradient
b. boundary layer thickness reducing to zero
c. laminar flow changing to turbulent flow
d. all of the above