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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