Hydraulics And Fluid Mechanics Set 9

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This set of Hydraulics and Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Hydraulics And Fluid Mechanics Set 9

Q1 | The velocity of the liquid flowing through the divergent portion of a Venturimeter
  • Remains constant
  • Increases
  • Decreases
  • Depends upon mass of liquid
Q2 | The volumetric change of the fluid caused by a resistance is known as
  • Volumetric strain
  • Volumetric index
  • Compressibility
  • Adhesion
Q3 | If the depth of water in an open channel is less than the critical depth, the flow is called
  • Critical flow
  • Turbulent flow
  • Tranquil flow
  • Torrential flow
Q4 | Choose the wrong statement
  • Fluids are capable of flowing
  • Fluids conform to the shape of the containing vessels
  • When in equilibrium, fluids cannot sustain tangential forces
  • When in equilibrium, fluids can sustain shear forces
Q5 | An orifice is said to be large, if
  • The size of orifice is large
  • The velocity of flow is large
  • The available head of liquid is more than 5 times the height of orifice
  • The available head of liquid is less than 5 times the height of orifice
Q6 | A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury?
  • The metal piece will simply float over the mercury
  • The metal piece will be immersed in mercury by half
  • Whole of the metal piece will be immersed with its top surface just at mercury level
  • Metal piece will sink to the bottom
Q7 | The centre of pressure acts __________ the centre of gravity of immersed surface.
  • At
  • Above
  • Below
  • None of these
Q8 | Dynamic viscosity of most of the liquids with rise in temperature
  • Increases
  • Decreases
  • Remain unaffected
  • Unpredictable
Q9 | The discharge over a right angled notch is (where H = Height of liquid above the apex of notch)
  • (8/15) Cd. 2g. H
  • (8/15) Cd. 2g. H3/2
  • (8/15) Cd. 2g. H²
  • (8/15) Cd. 2g. H5/2
Q10 | A square surface 3 m × 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is
  • 9,000 kg
  • 13,500 kg
  • 18,000 kg
  • 27,000 kg
Q11 | Select the correct statement
  • Local atmospheric pressure depends upon elevation of locality only
  • Standard atmospheric pressure is the mean local atmospheric pressure a* sea level
  • Local atmospheric pressure is always below standard atmospheric pressure
  • A barometer reads the difference between local and standard atmospheric pressure
Q12 | The shear stress-strain graph for a Newtonian fluid is a
  • Straight line
  • Parabolic curve
  • Hyperbolic curve
  • Elliptical
Q13 | The flow in which the particles of a fluid attain such velocities that varies from point to point in magnitude and direction as well as from instant to instant, is known as
  • One dimensional flow
  • Uniform flow
  • Steady flow
  • Turbulent flow
Q14 | Uniform flow occurs when
  • The direction and magnitude of the velocity at all points are identical
  • The velocity of successive fluid particles, at any point, is the same at successive periods of time
  • The magnitude and direction of the velocity do not change from point to point in the fluid
  • The fluid particles move in plane or parallel planes and the streamline patterns are identical in each pleasure
Q15 | At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be
  • Minimum
  • Maximum
  • Zero
  • Could be any value
Q16 | The discharge through a channel of trapezoidal section is maximum when
  • Width of channel at the top is equal to twice the width at the bottom
  • Depth of channel is equal to the width at the bottom
  • The sloping side is equal to half the width at the top
  • The sloping side is equal to the width at the bottom
Q17 | Piezometer is used to measure
  • Pressure in pipe, channels etc.
  • Atmospheric pressure
  • Very low pressures
  • Difference of pressure between two points
Q18 | The point at which the resultant pressure on an immersed surface acts, is known as
  • Centre of gravity
  • Centre of depth
  • Centre of pressure
  • Centre of immersed surface
Q19 | Choose the wrong statement
  • Any weight, floating or immersed in a liquid, is acted upon by a buoyant force
  • Buoyant force is equal to the weight of the liquid displaced
  • The point through which buoyant force acts, is called the center of buoyancy
  • Center of buoyancy is located above the center of gravity of the displaced liquid
Q20 | The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm". The pressure at 2.5 m below the oil surface will be
  • 2 metres of water column
  • 3 metres of water column
  • 3.5 metres of water column
  • 4 m of water column
Q21 | The total pressure on the top of a closed cylindrical vessel completely filled up with a liquid is
  • Directly proportional to (radius)2
  • Inversely proportional to (radius)2
  • Directly proportional to (radius)4
  • Inversely proportional to (radius)4
Q22 | The flow which neglects changes in a transverse direction is known as
  • One dimensional flow
  • Uniform flow
  • Steady flow
  • Turbulent flow
Q23 | The mass per unit volume of a liquid at a standard temperature and pressure is called
  • Specific weight
  • Mass density
  • Specific gravity
  • None of these
Q24 | A large Reynold number is indication of
  • Smooth and streamline flow
  • Laminar flow
  • Steady flow
  • Highly turbulent flow
Q25 | Which of the following statement is wrong?
  • A flow whose streamline is represented by a curve is called two dimensional flow.
  • The total energy of a liquid particle is the sum of potential energy, kinetic energy and pressure energy.
  • The length of divergent portion in a Venturimeter is equal to the convergent portion.
  • A pitot tube is used to measure the velocity of flow at the required point in a pipe.