Hydraulics and Fluid Mechanics MCQs
Hydraulics and Fluid Mechanics MCQs
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1: The velocity corresponding to Reynold number of 2800, is called
A. Higher critical velocity
B. Lower critical velocity
C. Sub-sonic velocity
D. Super-sonic velocity
2: Viscous force is the __________ of shear stress due to viscosity and cross-sectionar area of flow.
A. Ratio
B. Product
C. SUM
D. Different
3: Which of the following statement is wrong?
A. The length of divergent portion in a venturimeter is equal to the convergent portion.
B. A flow whose streamline is represented by a curve, is called two dimensional flow.
C. A pitot tube is used to measure the velocity of flow at the required point in a pipe.
D. The total energy of a liquid particle is the sum of potential energy, kinetic energy and pressure energy.
4: A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is
A. 9.28 kN
B. 28.9 kN
C. 2.89 kN
D. 8.29 kN
5: In open channels, the specific energy is the
A. Total energy per unit discharge
B. Total energy measured with respect to the datum passing through the bottom of the channel
C. Kinetic energy plotted above the free surface of water
D. Total energy measured above the horizontal datum
6: The power transmitted through the pipe is maximum when the head lost due to friction is equal to
A. Two-third of the total supply head
B. One-half of the total supply head
C. One-third of the total supply head
D. One-fourth of the total supply head
7: A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if
A. Loss of head and velocity of flow in both the pipes is same
B. Length of both the pipes is same
C. Loss of head and discharge of both the pipes is same
D. Diameter of both the pipes is same
8: The weight per unit volume of a liquid at a standard temperature and pressure is called
A. Specific gravity
B. None of these
C. Mass density
D. Specific weight
9: When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as
A. Uniform flow
B. Vortex flow
C. Steady flow
D. Turbulent flow
10: The total energy line lies over the centre line of the pipe by an amount equal to
A. Velocity head
B. Pressure head + velocity head
C. Pressure head
D. Pressure head - velocity head
11: An error of 1% in measuring head over the apex of the notch (H) will produce an error of __________ in discharge over a triangular notch.
A. 2%
B. 1%
C. 1.5%
D. 2.5%
12: Which of the following statement is correct?
A. In a compressible flow, the volume of the flowing liquid changes during the flow.
B. When the particles rotate about their own axes while flowing, the flow is said to be rotational flow.
C. All of these
D. A flow in which the volume of the flowing liquid does not change, is called incompressible flow.
13: The Euler’s equation for the motion of liquids is based upon the assumption that
A. The fluid is non - viscous, homogeneous and incompressible
B. All of these
C. The velocity of flow is uniform over the section
D. The flow is continuous, steady and along the stream line
14: The flow of water through the hole in the bottom of a wash basin is an example of
A. Uniform flow
B. Steady flow
C. Forced vortex
D. Free vortex
15: In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.
A. One-fourth
B. One-half
C. One-third
D. Equal to
16: In one dimensional flow, the flow
A. Takes place in curve
B. Takes place in straight line
C. Takes place in one direction
D. Is steady and uniform
17: In order to measure the flow with a venturimeter, it is installed in
A. Any direction and in any location
B. Inclined line with flow downwards
C. Horizontal line
D. Inclined line with flow upwards
18: The velocity corresponding to Reynold number of 2800
A. Higher critical velocity
B. Lower critical velocity
C. Super-sonic velocity
D. Sub-sonic velocity
19: A manometer is used to measure
A. Atomospheric pressure
B. Low pressure
C. Moderate pressure
D. High pressure
20: In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be
A. Eight times
B. Four times
C. Sixteen times
D. Double
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