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This set of Hydraulics and Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Hydraulics And Fluid Mechanics Set 17

Q1 | A flow in which the volume of a fluid and its density does no change during the flow is called

- incompressible
- compressible

Q2 | The volume of a fluid

- remains same
- decreases
- increases

Q3 | The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to

- half the depth
- half the breadth
- twice the depth
- twice the breadth

Q4 | The value of coefficient of discharge is

- less than
- same as
- more than

Q5 | A flow in which the viscosity of fluid is dominating over the inertia force is called

- steady flow
- unsteady flow
- laminar flow
- turbulent flow

Q6 | Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, at right angles to the direction of flow of the liquid is known as lift.

- TRUE
- FALSE

Q7 | A notch is, usually, made of a metallic plate.

- Correct
- Incorrect

Q8 | The flow of water through the hole in the bottom of a wash basin is an example of

- steady flow
- uniform flow
- free vortex
- forced vortex

Q9 | When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called

- Pascal's law
- Archimede's principle
- principle of floatation
- Bernoulli's theorem

Q10 | The difference between the notch and weir is that the notch is of bigger size and the weir is of a smaller size.

- Agree
- Disagree

Q11 | The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the

- pressure head
- velocity head
- pressure head + velocity head
- pressure head - velocity head

Q12 | When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called

- gauge pressure
- absolute pressure
- positive gauge pressure
- vacuum pressure

Q13 | The length of the divergent cone in a venturimeter is

- equal to
- double
- three to four times
- five to six times

Q14 | The depth of water in a channel corresponding to the minimum specific energy is known as critical depth.

- Agree
- Disagree

Q15 | The total energy line lies over the centre line of the pipe by an amount equal to

- pressure head
- velocity head
- pressure head + velocity head
- pressure head - velocity head

Q16 | The metacentric height of a ship is 0.6 m and the radius of gyration is 4 m. The time of rolling of a ship is

- 4.1s
- 5.2s
- 10.4s
- 14.1s

Q17 | The pressure at a stagnation point is always low.

- Agree
- Disagree

Q18 | In an internal mouthpiece, the absolute pressure head at vena contracta is

- less than
- more than

Q19 | The hydraulic mean depth for a circular pipe of diameter (d) is

- d / 6
- d / 4
- d / 2
- d

Q20 | According to Newton's law of viscosity, the shear stress on a layer of a fluid is

- equal to
- directly proportional
- inversely proportional

Q21 | A moving fluid mass may be brought to a static equilibrium position, by aplying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called

- Pascal's law
- Archimede's principle
- D-Alembert's principle
- none of these

Q22 | The siphon is used to connect two reservoirs at different levels intervened by a high ridge.

- TRUE
- FALSE

Q23 | The discharge through a channel of circular section will be maximum when the depth of water is

- 0.34 times
- 0.67 times
- 0.81 times
- 0.95 times

Q24 | If the value of coefficient of discharge increases, the discharge through the orifice decreases.

- TRUE
- FALSE

Q25 | The Francis formula for the discharge over Cippoletti weir is

- 1.84 LH1/2
- 1.84 LH
- 1.84 LH3/2
- 1.84 LH5/2