# Diploma Fluid Mechanics and Fluid Power three marks important questions

## Diploma Fluid Mechanics and Fluid Power three marks

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We have added Diploma Fluid Mechanics and Fluid Power three marks  for Unit 2 for the diploma mechanical III year / VI Semester as PDF. You can download Diploma Fluid Mechanics and Fluid Power three marks pdf

### Diploma Fluid Mechanics and Fluid Power three marks important questions

Unit 2 Flow of Fluids

1.Define Laminar Flow.

• Laminar flow is a smooth and regular flow.
• Laminar flow is a flow in which each liquid particle has a definite path, and the paths of individual particles do not across with each other.
• This type of flow is called as stream line flow.

2. Define Turbulent flow.

• Turbulent flow is flow in which the velocity of a particle will very in magnitude and direction form point and time to time.
• In this flow each liquid particles does not have a definite path and moves in and irregular way.

If the liquid properties such as velocity, pressure, density at any point of liquid do not change with respect to time, it is called steady flow.
Ex: Flow through a tap, when the water level in a tank is constant.

If at any section of flow, the quantity of liquid flowing per second is not constant the flow is called unsteady flow. Ex: flow through a tap when the head is not constant

5. Define uniform flow.

If the magnitude and direction of velocity at a point of liquid in motion do not vary with respect to time then the flow is called uniform flow.
Ex: flow of fluids through a pipe line whose cross sectional area is constant

6. Define Non-Uniform flow

If the magnitude and direction of velocity change from point to point in a liquid flow, it is called Non uniform flow.

7. What is rotational flow?

In rotational flow, liquid particle rotate about its own axis Ex. River flow

8. What is irrotational flow?

In irrotational flow, liquid particle does not rotate about its own axis. Ex. Flow of high viscous liquid.

9. What is Rate of flow?

Volume of liquid flowing per second through a section of pipe is known as the rate of discharge or simply discharge.

Rate of flow or Discharge (Q) = Area x Velocity

Q= a x v m3 / s

10. Define Continuity equation

Continuity Equation states that “If an incompressible liquid is continuously flowing through a pipe or a channel whose section may or may not be uniform the quantity of liquid passing per sections”.

Q = a1v1 = a2v2

11. State Bernoullis theorem

Bernoulli’s theorem states “for a perfect in compressible liquid, flowing in a continuous stream, the total energy of a particle remains same while the particle moves from one point to another point”.

12. What are the assumptions of Bernoulis theorem?

• Flow is incompressible and homogeneous.
• Flow is continuous.
• Flow is ideal.
• Flow is one – dimensional.
• Flow is along a stream line.
• No energy transfer to the flow (or) from the flow.

13. What are the limitations of Bernoullis theorem?

1.velocity of flow is constant.
2.frictional force is neglected.
3.no loss of energy is assumed.

14. Mention few applications of Bernoullis theorem?

1. Venturimeter
2. Orifice meter

3. Pitot tube
4. Nozzle meter or flow Nozzle.

15. What is venturimeter?

Verturimeter is an instrument used for measuring the discharge quantity of liquid flowing in a pipe.  It consists of
1. Convergent cone
2. Throat
3. Divergent cone.

16. What is Orificemeter?

Orifice meter is used to measure the discharge of the liquid flowing in a pipe. It consist of sharp edged circular hole plate and is fixed inside the pipe. The working principle of Orifice meter is similar to Venturimeter. A differential manometer is used to measure the pressure difference between the two sides of Orifice meter.

17. What is Pitot tube?

Pitot tube is an important instrument used to measure the velocity of flow in a river or in open channel. It is a glass tube, both ends are open and bent through 90 deg. The Liquid flow in to the tube and rises in the tube until all its kinetic energy converted into the potential energy.

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