Top 350+ Solved Hydraulics and Fluid Mechanics MCQ Questions Answer
Q. According to Bernoulli's equation
a. Z + p/w + v²/2g = constant
b. Z + p/w - v²/2g = constant
c. Z - p/w + v²/2g = constant
d. Z - p/w - v²/2g = constant
Q. Differential manometer is used to measure
a. Pressure in pipes, channels etc.
b. Atmospheric pressure
c. Very low pressure
d. Difference of pressure between two points
Q. Non uniform flow occurs when
a. The direction and magnitude of the velocity at all points are identical
b. The velocity of successive fluid particles, at any point, is the same at successive periods of time
c. Velocity, depth, pressure, et change from point to point in the fluid flow.
d. The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane
Q. Barometer is used to measure
a. velocity of liquid
b. atmospheric pressure
c. pressure in pipes and channels
d. difference of pressure between two points in a pipe
Q. The pressure of a liquid measured with the help of a piezometer tube is
a. vacuum pressure
b. gauge pressure
c. absolute pressure
d. atmospheric pressure
Q. The coefficient of discharge for an external mouthpiece depends upon
a. velocity of liquid
b. pressure of liquid
c. area of outhpiece
d. length of mouthpiece
Q. A flow through an expanding tube at constant rate is called
a. Steady uniform flow
b. Steady non-uniform flow
c. Unsteady uniform flow
d. Unsteady non-uniform flow
Q. Reynolds number is significant in
a. Supersonics, as with projectile and jet propulsion
b. Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
c. Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls
d. All of the above
Q. The tendency of a liquid surface to contract is due to the following property
a. Cohesion
b. Adhesion
c. Viscosity
d. Surface tension
Q. The Newton's law of resistance is based on the assumption that the
a. Planes of the body are completely smooth
b. Space around the body is completely filled with the fluid
c. Fluid particles do not exert any influence on one another
d. All of the above
Q. For manometer, a better liquid combination is one having
a. Higher surface tension
b. Lower surface tension
c. Surface tension is no criterion
d. High density and viscosity
Q. The flow in a pipe is neither laminar nor turbulent when Reynold number is
a. Less than 2000
b. Between 2000 and 2800
c. More than 2800
d. None of these
Q. The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as
a. Meta center
b. Center of pressure
c. Center of buoyancy
d. Center of gravity