What are the two types of steam turbine?

What are the two types of steam turbine?

The two types of steam turbines most widely used are the backpressure and the extraction-condensing types (Fig. 19.3). The choice between backpressure turbine and extraction-condensing turbine depends mainly on the quantities of power and heat, quality of heat, and economic factors.

What are the different methods of compounding of steam turbine stages?

• Necessity.
• Types of steam turbines.
• Types of compounding.
• Velocity compounding of Impulse Turbine.
• Pressure compounding of Impulse Turbine.
• Pressure-Velocity compounded Impulse Turbine.
• Pressure compounding of Reaction Turbine.
• See also.

What is the objective of steam turbine governing?

Overview. Steam Turbine Governing is the procedure of monitoring and controlling the flow rate of steam into the turbine with the objective of maintaining its speed of rotation as constant. The flow rate of steam is monitored and controlled by interposing valves between the boiler and the turbine.

Which of the following is method of compounding of steam turbine?

Explanation: Pressure compounding is used in Rateau and Zoelly turbine for reduction of rotor speed. In this method the steam is expanded in steps and after each expansion the kinetic energy of the steam is absorbed by a set of moving blades.

Which of the following is an example of impulse turbine?

Explanation: Pelton Wheel Turbine is an example of impulse Turbine.

What is a reaction turbine?

A reaction turbine is constructed of rows of fixed blades and rows of moving blades. The fixed blades act as nozzles. The moving blades move as a result of the impulse of steam received (caused by a change in momentum) and also as a result of expansion and acceleration of the steam relative to them.

What is reaction turbine give example?

A reaction turbine doesn’t change the direction of the fluid flow as drastically as an impulse turbine: it simply spins as the fluid pushes through and past its blades. Wind turbines are perhaps the most familiar examples of reaction turbines. The shaft spins a generator that makes electricity.

How many types of reaction turbine are there?

two types

What is difference between impulse and reaction turbine?

The main differences between Impulse and Reaction turbines are, all hydraulic energy is converted into kinetic energy by a nozzle in the Impulse turbine and whereas In Reaction turbine Only some amount of the available energy is converted into kinetic energy.

How many types of reaction are there?

five

Which of the following is a reaction turbine?

Explanation: When the entire pressure of water is converted into kinetic energy in a nozzle and the jet thus formed drives the wheel then the turbine is called impulse turbine. Pelton turbine works in similar way, so it is an impulse turbine. Francis, Kaplan and propeller turbines are reaction turbines.

Which is not a reaction turbine?

Pelton wheel is not a reaction turbine whereas Thomson’s turbine, Journal turbine and Fourneyron turbine are reaction turbine.

Where are reaction turbines used?

REACTION TURBINE The runner is placed directly in the water stream flowing over the blades rather than striking each individually. Reaction turbines are generally used for sites with lower head and higher flows than compared with the impulse turbines.

Why draft tubes are added in impulse reaction turbines?

The draft tube is a conduit which connects the runner exit to the tail race where the water is being finally discharged from the turbine. The primary function of the draft tube is to reduce the velocity of the discharged water to minimize the loss of kinetic energy at the outlet.

What is flow ratio in turbine?

The flow ratio of Francis turbine is defined as the ratio of the. A. Velocity of flow at inlet to the theoretical jet velocity. Theoretical velocity of jet to the velocity of flow at inlet. Velocity of runner at inlet to the velocity of flow at inlet.

How can we prevent cavitation?

Try the following:

1. Reduce motor speed (RPMs).
2. Install an impeller inducer.
3. Incorporate a booster pump into your pump system.
4. If possible, reduce the temperature of your pump, liquid, and/or other components.
5. Increase liquid level around the suction area.

What is the main classification of pumps?

Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravity pumps. Pumps operate by some mechanism (typically reciprocating or rotary), and consume energy to perform mechanical work moving the fluid.

What are the two main classification of pumps?

Pumps are divided into 2 major categories: Dynamic and Positive Displacement (aka Displacement).

What are the two main types of water pumps?

Depending on your needs and necessities there are two major types of pumps available in the market, namely – Domestic and Agricultural Pumps….BUYING GUIDE FOR WATER PUMPS

• Self-Prime Regenerative Pumps.
• Centrifugal Pumps.
• Submersible Pumps.
• Bore Well Compressor Pumps.
• Pressure Booster Pumps.
• Shallow Well Pumps.

Why positive displacement pump is called positive?

A positive displacement pump makes a fluid move by trapping a fixed amount and forcing (displacing) that trapped volume into the discharge pipe. Some positive displacement pumps use an expanding cavity on the suction side and a decreasing cavity on the discharge side.

Is used to clean blockage in the line?

An inspection chamber is used to clean blockage in the line and change direction of pipes.

Which of the following statement is wrong regarding filtration?

1. Which of the following statement is wrong regarding filtration? Explanation: Filtration is a primary turbidity removal process. Explanation: In Mechanical Straining, particles coarser than the void size is arrested.

Which gas is released when alum is added to water?

Carbon dioxide gas

Which method of disinfection is used in rural areas?

Boiling

Which of the following is known as shut off valve?

Which of the following is known as Shut off valve? Explanation: Sluice valve is called as shut off valve as the water in pipes can be shut off from them. They offer no resistance to the flow of water when the valve is wide open.