Important questions about Hydraulics And Fluid Mechanics. Hydraulics And Fluid Mechanics MCQ questions with answers. Hydraulics And Fluid Mechanics exam questions and answers for students and interviews.

1. A flow in which __________ force is dominating over the viscosity is called turbulent flow.

Options

A : elastic

B : surface tension

C : viscous

D : inertia

2. When the pressure intensity at a point is less than the local atmospheric pressure, then the difference of these two pressures is called vacuum pressure.

Options

A : Agree

B : Disagree

C :

D :

4. The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece, and H = Height of liquid above the mouthpiece)

Options

A : 0.855 a 2 gH

B : 1.855 aH 2 g

C : 1.585 a 2 gH

D : 5.85 aH 2 g

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

Options

A : Agree

B : Disagree

C :

D :

6. In an external or internal mouthpiece, the absolute pressure head at vena contracta is zero when atmospheric pressure head is 10.3 m of water.

Options

A : Correct

B : Incorrect

C :

D :

7. A flow through a long pipe at constant rate is called

Options

A : steady uniform flow

B : steady non-uniform flow

C : unsteady uniform flow

D : unsteady non-uniform flow

8. The Francis formula for the discharge over Cippoletti weir is

Options

A : 1.84 LH 1/2

B : 1.84 LH

C : 1.84 LH 3/2

D : 1.84 LH 5/2

9. A 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.

Options

A : Agree

B : Disagree

C :

D :

10. The Euler's equation for the motion of liquids is based upon the assumption that

Options

A : the fluid is non - viscous, homogeneous and incompressible

B : the velocity of flow is uniform over the section

C : the flow is continuous, steady and along the stream line

D : all of the above

1. A body floating in a liquid is said to be in a stable equilibrium, if its metacentre coincides with its centre of gravity.

Options

A : True

B : False

C :

D :

2. When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece)

Options

A : 0.5 a 2 gH

B : 0.707 a 2 gH

C : 0.855 a 2 gH

D : a 2 gH

3. A piezometer tube is used only for measuring

Options

A : low pressure

B : high pressure

C : moderate pressure

D : vacuum pressure

4. A venturiflume is a flumed structure constructed across a channel by restricting its width.

Options

A : True

B : False

C :

D :

5. The velocity corresponding to Reynold number of 2000 is called

Options

A : sub-sonic velocity

B : super-sonic velocity

C : lower critical velocity

D : higher critical velocity

6. The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid.

Options

A : equal to

B : less than

C : more than

D :

7. All the gases are considered to have compressible flow and all the liquids are considered to have incompressible flow.

Options

A : Correct

B : Incorrect

C :

D :

8. Select the correct statement

Options

A : Weber's number is the ratio of inertia force to elastic force.

B : Weber's number is the ratio of gravity force to surface tension force.

C : Weber's number is the ratio of viscous force to pressure force.

D : Weber's number is the ratio of inertia force to surface tension force.

9. The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.

Options

A : less than

B : more than

C :

D :

10. Euler's number is the ratio of __________ force to pressure force.

Options

A : inertia

B : gravity

C : viscous

D :

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