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civil - Applied Hydraulic Engineering

Important Question And Answer: civil - Applied Hydraulic Engineering - Part 1

   Posted On :  13.07.2016 09:25 pm

civil - Applied Hydraulic Engineering

1.What do you mean by turbine?

 

The hydraulic machine which convert the hydraulic energy in to mechanical energy is called turbine

 

2.Define pump :

 

It is defined as the hydraulic machine which convert mechanical energy in to hydraulic energy

 

3.Define sub critical flow:

 

If the froude number is less than one then the flow is said to be sub critical flow

 

4.Define critical flow:

 

If the froude number is less equal to one it is called as critical flow.

 

5.Define supercritical flow:

 

If the froude number is greater than one it is called as super critical

 

flow

 

6. What are the possible types of flow in open channel with respect to space and time? A,steady and unsteady flow

 

B,uniform and nonuniform flow

 

7.what do you know about uniform and non uniform flow?

 

Uniform flow: If the given length of the channel ,depth ,velocity ,the rate of flow, cross

 

section are constant.

 

Non Uniform flow: If the given length of the channel ,depth ,velocity ,the rate of flow, cross section are not constant.

 

8.Define specific energy:

 

It is defined as energy per unit weight of the liquid with respect to the bottom of the channel.

 

9.What is meant by wetted perimeter?

 

The wetted perimeter (p) is the length of the line of intersection of the channel wetted surface with the cross section plan normal to the direction of flow.

 

10.Define critical depth:

 

It is defined as the depth of flow of water at which the specific energy is minimum.

 

11.Define critical velocity:

The velocity of flow at the critical depth is known as critical velocity.

 

12.Define the term most economical section of the channel:

 

A section of the channel is said to be most economical when the cost of construction of the channel is minimum. But the cost of construction depend up on the excavation and lining to keep the cost minimum The wetted perimeter for a given discharge should be minimum.

 

13.Define gradually varying flow

 

If the change in depth in a varying flow is gradual so that the curvature of the

 

streaming line is not excessive such flow is called gradually varying flow.

 

14.Define Rapidly varying flow

 

If the curvature in a varied flow is large and depth changes appreciably over

 

short length it is called rapidly varying flow.

 

15.Define affux

 

The maximum increase in water level due to obstruction in the path of flow is

 

known as affux.

 

15.Define length of backwater curve

 

The distance along the bed of the channel between the section where water starts raising to

 

the section where water is having maximum height is known as the length of the back water curve

 

16.Define back water

 

The profile of the raising water on the upstream side of the dam is called as back water curve.

 

17.Define hydraulic jump

The raise of water level  which takes  place  due  to  the transformation  of the unstable  shooting flow  ( super critical flow )  to the  stable  Streaming flow ( sub critical  flow ) is called hydraulic jump.

 

 

 18.Define cavitations

cavitations is defined as phenomenon of formation of vapour bubbles in a region of a flowing liquid where the pressure in the liquid is falls below than vapour pressure and sudden collapsing of these vapour bubbles in a region of higher pressure.

 

19.What is known by governing of a turbine?

 

Governing  of a turbine is defined as the operation by which the speed of the turbine is

 

kept constant under all conditions of working . It is done by oilpressure generator.

 

20.Explain gross head

 

The difference between head race level and tail race level when no water is flowing is know as gross head 21.Explain net head

It is defined as the head available at the inlet of turbine .If Hf is the loss due to friction between water and penstock then net head

          H=Hg-Hf   

22.Define Hydraulic Efficiency:       

          It is defined as the ratio of power delivered to the runner to the power supplied at the inlet. 

23.Define mechanical efficiency       

          It is defined as the ratio of power at the shaft of the turbine to the power delivered by the water to runner.  

24.Define volumetric efficiency        

          It is defined as the ratio of volume of water actually striking the runner to the Volume of water supplied to the runner. 

25.Define over all efficiency   

          It is defined as the ratio of shaft power by water power        

26.Explain impulse turbine    

          If at the inlet of the turbine the energy available is only kinetic energy      the turbine is known as impulse turbine.     

27.Explain Reaction turbine   

          if at the inlet of the turbine the water possesses kinetic energy as well as pressure energy the turbine is known as reaction turbine.   

28.Explian tangential flow turbine   

          If the water flows along the tangent of the runner, the turbine is known as the tangential flow turbine.        

29.Expain radial flow turbine

          If the water flows in the radial direction through the runner the turbine I called radial flow turbine.        

30.Explain inward flow radial turbine       

          If the water flows from outwards to inwards radially the turbine is called iward radial flow turbine.

 

31.Explain outward flow radial turbine

 

If the water flows radially from inwards to outwards the turbine is known sa outward radial flow turbine.

 

32.Define axial flow turbine

 

If the water flows through the runner along the direction parallel to the axis of rotation of the runner the turbine is called axial flow turbine.

 

33.what is Pelton wheel:

 

Pelton wheel or Pelton turbine is a tangential flow impulse turbine. The water strikes the bucket along the tangent of the runner . The energy available at the inlet of the Turbine is only kinetic energy.This turbine is used for high heads.

 

34.What is breaking jet?

 

When the nozzle is completely closed ,the amount of water striking the runner reduces to zero but the runner due to inertia goes on revolving

 

for a long time to stop the runner in a short time a small nozzle is

 

provided which direct the jet of water on the back of vanes .This jet of water is called breaking jet.

 

35.What is jet ratio?

 

It is the ratio of pitch diameter (D) to the diameter of jet (d).

 

 

36.What is Draft tube?

 

A tube or pipe of gradually increasing area is used for discharging water from the exit of the tubine to the tail race is called draft tube.

 

 

37.Define Degree of Reaction (R)

 

It is defined as the ratio of change of pressure energy inside the runner to the change of total energy out side the runner.

 

 

38.what is radial discharge?

 

This means the angle made by absolute velocity with the tangent on the wheel is 90 and the component of whirl velocity is zero.

 

 

39.Define Francis turbine:

 

Inward flow reaction turbine having radial discharge at outlet is known as francis turbine

 

40.Define propeller turbine:

This is an example of axial flow reaction turbine . Here the vanes are fixed to the hub and are not adjustable.

 

41.Define Kaplan turbine:

This is an example of axial flow reaction turbine. Here the vanes are not fixed to the hub and are adjustable.

 

42.What are the use of draft tube?

1.the net head on the turbine increases.

2.due to increase in net head the power and efficiency of the turbine also increases.

3.the large amount of rejected kinetic energy is converted in to usefull pressure energy

 

43.What are types of draft tube?

1.conical draft tube

2.simple elbow tube

3.moody spreading tube

3.draft tube with circular inlet and rectangular outlet.

 

44.What are the types of characteristic curves

1.Main characteristic curves

2.Operating characteristic curve

3.Muschel characteristic curves

 

45.What is specific speed of the turbine?

It is defined as the speed of a turbine which will develop unit power under unit head.

 

46.Define unit quantities;

Unit quantities are the quantities which are obtained when the head on the turbine are unity.

 

47.Explain about characteristic curves of a hydraulic turbine

Characteristic curves of a hydraulic turbine are the curves with the help of which the exact behaviour and performance of the turbine under different working conditions can be known.

 

48.What is meant by conveyance of the channel?         

The conveyance of the channel is denoted by k and is given by k=AC?(m)

 

49.Define the term most economical section:

A section of the channel is said to be most economical when the cost of construction of the channel is minimum. But the cost of construction mainly depend up on the excavation and lining to keep the cost minimum ,the wetted perimeter for a given discharge should be minimum.

 

50.What are the conditions of rectangular channel of best section?

The two conditions are breadth is equal to two times the depth (b=2d) and hydraulic mean depth is equal to half  the depth (m=d/2)

 

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