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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