Hydraulics And Fluid Mechanics Set 18 MCQs

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