### Hydraulics And Fluid Mechanics Set 9

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
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
• 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
Q22 | The flow which neglects changes in a transverse direction is known as
• One dimensional flow
• Uniform 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