### Hydraulics And Fluid Mechanics Set 18

This set of Hydraulics and Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Hydraulics And Fluid Mechanics Set 18

Q1 | A differential manometer is used to measure
• atmospheric pressure
• pressure in pipes and channels
• pressure in venturimenter
• difference of pressures between two points in pipe
Q2 | When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular velocity, the pressure
• varies as the square of the radial distance
• increases linearly as its radial distance
• increases as the square of the radial distance
• decreases as the square of the radial distance
Q3 | 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
Q4 | The Reynold's number of a ship is
• directly proportional
• inversely proportional
Q5 | The purpose of a surge tank is
• to control the pressure variations due to rapid changes in the pipe line flow
• to eliminate water hammer possibilities
• to regulate flow of water to turbines by providing necessary retarding head of water
• all of the above
Q6 | In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then the mouthpiece is said to be
• running full
• running free
• partially running full
• partially running free
Q7 | 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, inetic 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.
Q8 | The length of a liquid stream while flowing over a weir
• expands
• does not change
• contracts
Q9 | If a body floating in a liqid 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
• neutral
• stable
• unstable
Q10 | The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is
• 200 kg / m3
• 400 kg / m3
• 600 kg / m3
• 800 kg / m3
Q11 | A pitot tube is used to measure the
• velocity of flow at the required point in a pipe
• pressure difference between two points in a pipe
• total pressure of liquid flowing in a a pipe
• discharge through a pipe
Q12 | In an internal mouthpiece, if the jet after contraction expands and fills up the whole mouthpiece, then the mouthpiece is said to be running free.
• TRUE
• FALSE
Q13 | The water hammer in pipes occurs due to sudden change in the velocity of flowing liquid.
• Agree
• Disagree
Q14 | The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at that point, is known as
• path line
• stream line
• steak line
• potential line
Q15 | The viscosity of water is
• higher
• lower
Q16 | The siphon will work satisfactorily, if the minimum pressure in the pipe is
• equal to
• less than
• more than
Q17 | When the Mach number is less than unity, the flow is called
• sub-sonic flow
• sonic flow
• super-sonic flow
• hyper-sonic flow
Q18 | Froude's number is the ratio of inertia force to
• pressure force
• elastic force
• gravity force
• surface tension force
Q19 | In flow in which each liquid particle does not have a definite path and the paths of individual particles also cross each other, is called turbulent flow.
• Agree
• Disagree
Q20 | The coefficient of discharge in case of internal mouthpiece is
• less than
• more than
Q21 | The hydraulic gradient line is always parallel to the centre line of the pipe.
• Correct
• Incorrect
Q22 | In two dimensional flow, the flow does not take place in a curve.
• TRUE
• FALSE
Q23 | A closed tank is completely filled with an oil. If it is made to move with a horizontal acceleration, then the pressure at the back end will be more than that at the front end.
• Correct
• Incorrect
Q24 | Which of the following statement is correct ?
• In a compressible flow, the volume of the flowing liquid changes during the flow.
• A flow in which the volume of the flowing liquid does not change, is called incompressible flow.
• When the particles rotate about their own axes while flowing, the flow is said to be rotational flow.
• all of the above
Q25 | The metacentric height is the distance between the
• centre of gravity of the floating body and the centre of buoyancy
• centre of gravity of the floating body and the metacentre
• metacentre and centre of buoyancy
• original centre of buoyancy and new centre of buoyancy