Hydraulics And Fluid Mechanics Set 6

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This set of Hydraulics and Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Hydraulics And Fluid Mechanics Set 6

Q1 | The center of pressure of a surface subjected to fluid pressure is the point
  • On the surface at which resultant pressure acts
  • On the surface at which gravitational force acts
  • At which all hydraulic forces meet
  • Similar to metacentre
Q2 | The variation in the volume of a liquid with the variation of pressure is called its
  • Surface tension
  • Compressibility
  • Capillarity
  • Viscosity
Q3 | The surface tension of mercury at normal temperature is __________ that of water.
  • Same as
  • Lower than
  • Higher than
  • None of these
Q4 | Flow of water in a pipe about 3 metres in diameter can be measured by
  • Orifice plate
  • Venturimeter
  • Rotameter
  • Pitot tube
Q5 | According to Francis formula, the discharge over a rectangular weir is (where n = Number of end contractions)
  • (2/3) × Cd (L - nH) ×
  • (2/3) × Cd (L - 0.1nH) × × H3/2
  • (2/3) × Cd (L - nH) × × H²
  • (2/3) × Cd (L - nH) × × H5/2
Q6 | The equation of continuity holds good when the flow
  • Is steady
  • Is one dimensional
  • Velocity is uniform at all the cross sections
  • All of the above
Q7 | A thick liquid like syrup has a __________ viscosity than a light liquid like water.
  • Lesser
  • Greater
  • Same
  • None of these
Q8 | Cavitation will begin when
  • The pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
  • Pressure becomes more than critical pressure
  • Flow is increased
  • Pressure is increased
Q9 | When a liquid is flowing through a pipe, the velocity of the liquid is
  • Maximum at the centre and minimum near the walls
  • Minimum at the centre and maximum near the walls
  • Zero at the centre and maximum near the walls
  • Maximum at the centre and zero near the walls
Q10 | The velocity through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.
  • 0.34 times
  • 0.67 times
  • 0.81 times
  • 0.95 times
Q11 | Resultant pressure of the liquid in the case of an immersed body acts through
  • Centre of gravity
  • Centre of pressure
  • Metacentre
  • Centre of buoyancy
Q12 | A fluid is said to be ideal, if it is
  • Incompressible
  • Viscous and incompressible
  • Inviscous and compressible
  • Inviscous and incompressible
Q13 | In a depressed nappe
  • The pressure below the nappe is atmospheric
  • The pressure below the nappe is negative
  • The pressure above the nappe is atmospheric
  • The pressure above the nappe is negative
Q14 | The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to
  • 2100
  • 2700
  • 10,000
  • 21,000
Q15 | In one dimensional flow, the flow
  • Is steady and uniform
  • Takes place in straight line
  • Takes place in curve
  • Takes place in one direction
Q16 | To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than
  • 2.4 m above the hydraulic gradient
  • 6.4 m above the hydraulic gradient
  • 10.0 m above the hydraulic gradient
  • 5.0 above the hydraulic gradient
Q17 | The loss of head at exit of a pipe is (where v = Velocity of liquid in the pipe)
  • v²/2g
  • 0.5v²/2g
  • 0.375v²/2g
  • 0.75v²/2g
Q18 | Metacentre is the point of intersection of
  • Vertical upward force through e.g. of body and center line of body
  • Buoyant force and the center line of body
  • Midpoint between e.g. and center of buoyancy
  • All of the above
Q19 | The imaginary line drawn in the fluid in such a way that the tangent to any point gives thedirection of motion at that point, is known as
  • Path line
  • Stream line
  • Steak line
  • Potential line
Q20 | An open vessel of water is accelerated up an inclined plane. The free water surface will
  • Be horizontal
  • Make an angle in direction of inclination of inclined plane
  • Make an angle in opposite direction to inclination of inclined plane
  • Any one of above is possible
Q21 | The discharge over a rectangular notch is
  • Inversely proportional to H3/2
  • Directly proportional to H3/2
  • Inversely proportional to H5/2
  • Directly proportional to H5/2
Q22 | The flow in which each liquid particle has a definite path and their paths do not cross each other is called
  • One dimensional flow
  • Streamline flow
  • Steady flow
  • Turbulent flow
Q23 | The magnitude of water hammer depends upon the
  • Elastic properties of the pipe material
  • Elastic properties of the liquid flowing through the pipe
  • Speed at which the valve is closed
  • All of the above
Q24 | The fluid forces considered in the Navier Stokes equation are
  • Gravity, pressure and viscous
  • Gravity, pressure and turbulent
  • Pressure, viscous and turbulent
  • Gravity, viscous and turbulent
Q25 | Cavitation is caused by
  • High velocity
  • High pressure
  • Weak material
  • Low pressure