### Hydraulics And Fluid Mechanics Set 8

This set of Hydraulics and Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Hydraulics And Fluid Mechanics Set 8

Q1 | The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.
• Less than
• More than
• Equal to
• None of these
Q2 | The line of action of the buoyant force acts through the Centroid of the
• Submerged body
• Volume of the floating body
• Volume of the fluid vertically above the body
• Displaced volume of the fluid
Q3 | The intensity of pressure at any point, in a liquid, is
• Directly proportional to the area of the vessel containing liquid
• Directly proportional to the depth of liquid from the surface
• Directly proportional to the length of the vessel containing liquid
• Inversely proportional to the depth of liquid from the surface
Q4 | During the opening of a valve in a pipe line, the flow is
• Uniform
• Laminar
Q5 | A manometer is used to measure
• Atmospheric pressure
• Pressure in pipes and channels
• Pressure in Venturimeter
• Difference of pressures between two points in a pipe
Q6 | For hypersonic flow, the Mach number is
• Unity
• Greater than unity
• Greater than 2
• Greater than 4
Q7 | The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)
• 2gH
• H × g)
• 2g × H
• 2gh)
Q8 | For pipes, laminar flow occurs when Reynolds number is
• Less than 2000
• Between 2000 and 4000
• More than 4000
• Less than 4000
Q9 | When the flow in an open channel is gradually varied, the flow is said to be
Q10 | In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, thenthe mouthpiece is said to be
• Running full
• Running free
• Partially running full
• Partially running free
Q11 | The units of kinematic viscosity are
• Metres² per sec
• kg sec/metre
• Newton-sec per metre
• Newton-sec per metre
Q12 | The length of a liquid stream while flowing over a weir __________ at the ends of the sill.
• Expands
• Does not change
• Contracts
• None of these
Q13 | Newton's law of viscosity is a relationship between
• Shear stress and the rate of angular distortion
• Shear stress and viscosity
• Shear stress, velocity and viscosity
• Pressure, velocity and viscosity
Q14 | The total energy line lies over the hydraulic gradient line by an amount equal to the
Q15 | Choose the wrong statement
• The horizontal component of the hydrostatic force on any surface is equal to the normal force on the vertical projection of the surface
• The horizontal component acts through the center of pressure for the vertical projection
• The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area
• The vertical component passes through the center of pressure of the volume
Q16 | In open channels, the specific energy is the
• Total energy per unit discharge
• Total energy measured with respect to the datum passing through the bottom of the channel
• Total energy measured above the horizontal datum
• Kinetic energy plotted above the free surface of water
Q17 | For a floating body to be in stable equilibrium, its metacentre should be
• Below the center of gravity
• Below the center of buoyancy
• Above the center of buoyancy
• Above the center of gravity
Q18 | A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is
• 2.89 kN
• 8.29 kN
• 9.28 kN
• 28.9 kN
Q19 | Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surfacewill be
• 1000 kg
• 4000 kg
• 2000 kg
• 8000 kg
Q20 | If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, the body is said to be in __________ equilibrium.
• Neutral
• Stable
• Unstable
• None of these
Q21 | A streamline is defined as the line
• Parallel to central axis flow
• Parallel to outer surface of pipe
• Of equal velocity in a flow
• Along which the pressure drop is uniform
Q22 | The flow in a pipe or channel is said to be non-uniform when
• The liquid particles at all sections have the same velocities
• The liquid particles at different sections have different velocities
• The quantity of liquid flowing per second is constant
• Each liquid particle has a definite path
Q23 | Hydrometer is used to determine
• Specific gravity of liquids
• Specific gravity of solids
• Specific gravity of gases
• Relative humidity
Q24 | The dynamic viscosity of the liquid __________ with rise in temperature.
• Remain unaffected
• Increases
• Decreases
• None of these
Q25 | For pipes, turbulent flow occurs when Reynolds number is
• Less than 2000
• Between 2000 and 4000
• More than 4000
• Less than 4000