Podcast
Questions and Answers
What is the main function of turbines?
What is the main function of turbines?
- Convert thermal energy into mechanical energy
- Convert electrical energy into mechanical energy
- Convert mechanical energy into hydraulic energy
- Convert hydraulic energy into mechanical energy (correct)
What is the term used to describe the electric power obtained from the hydraulic energy?
What is the term used to describe the electric power obtained from the hydraulic energy?
- Hydroelectric power (correct)
- Thermal power
- Electric power
- Hydraulic power
What is the Gross Head of a turbine?
What is the Gross Head of a turbine?
- The head race level minus tail race level when no water is flowing (correct)
- The efficiency of a turbine
- The head loss due to friction between penstocks and water
- The head available at the inlet of the turbine
Which term is used interchangeably with 'effective head' for a turbine?
Which term is used interchangeably with 'effective head' for a turbine?
What are losses caused by bend, pipe fittings, and entrance of penstock collectively known as?
What are losses caused by bend, pipe fittings, and entrance of penstock collectively known as?
In the equation H = Hg - hf, what does 'hf' represent?
In the equation H = Hg - hf, what does 'hf' represent?
What is the main difference between an inward radial flow turbine and an outward radial flow turbine?
What is the main difference between an inward radial flow turbine and an outward radial flow turbine?
Which type of turbine is a Pelton wheel?
Which type of turbine is a Pelton wheel?
What is the function of the casing in a Pelton turbine?
What is the function of the casing in a Pelton turbine?
Why is a breaking jet used in a Pelton turbine?
Why is a breaking jet used in a Pelton turbine?
What is controlled by a spear in the nozzle of a Pelton turbine?
What is controlled by a spear in the nozzle of a Pelton turbine?
How are the buckets of a Pelton wheel shaped to deflect the water jet?
How are the buckets of a Pelton wheel shaped to deflect the water jet?
What part of a Pelton wheel divides the jet into two equal parts before it strikes the buckets?
What part of a Pelton wheel divides the jet into two equal parts before it strikes the buckets?
What describes a tangential flow impulse turbine like a Pelton wheel?
What describes a tangential flow impulse turbine like a Pelton wheel?
Which material is NOT typically used for making the buckets of a Pelton wheel?
Which material is NOT typically used for making the buckets of a Pelton wheel?
What is the mathematical expression for hydraulic efficiency?
What is the mathematical expression for hydraulic efficiency?
Which type of turbine is identified by having only kinetic energy at the inlet?
Which type of turbine is identified by having only kinetic energy at the inlet?
What does volumetric efficiency measure?
What does volumetric efficiency measure?
In a reaction turbine, what happens to the pressure energy as water flows through the runner?
In a reaction turbine, what happens to the pressure energy as water flows through the runner?
Which type of turbine is enclosed in an air-tight casing?
Which type of turbine is enclosed in an air-tight casing?
What is the definition of mechanical efficiency?
What is the definition of mechanical efficiency?
'Specific speed' is a classification criterion based on what aspect of hydraulic turbines?
'Specific speed' is a classification criterion based on what aspect of hydraulic turbines?
What is the primary reason for a decrease in power as water flows over the vanes of a turbine?
What is the primary reason for a decrease in power as water flows over the vanes of a turbine?
'Overall Efficiency' is defined as the ratio of what variables?
'Overall Efficiency' is defined as the ratio of what variables?
'Volumetric Efficiency' measures the ratio of what volumes?
'Volumetric Efficiency' measures the ratio of what volumes?
What is the purpose of the draft-tube in a turbine system?
What is the purpose of the draft-tube in a turbine system?
In the design of a Pelton wheel, what is determined as 5 times the diameter of the jet?
In the design of a Pelton wheel, what is determined as 5 times the diameter of the jet?
Who is the modern Francis Turbine named after?
Who is the modern Francis Turbine named after?
What type of turbine is a Francis Turbine?
What type of turbine is a Francis Turbine?
What is the speed ratio for a Francis Turbine?
What is the speed ratio for a Francis Turbine?
In an inward flow reaction turbine, where does the water enter and leave?
In an inward flow reaction turbine, where does the water enter and leave?
'Hub' or 'boss' in an axial flow reaction turbine serves as what?
'Hub' or 'boss' in an axial flow reaction turbine serves as what?
'Flow ratio' for a Francis Turbine is expressed as?
'Flow ratio' for a Francis Turbine is expressed as?
What happens to the speed of the turbine when the load on the generator decreases?
What happens to the speed of the turbine when the load on the generator decreases?
How does the centrifugal governor respond when the speed of the generator increases?
How does the centrifugal governor respond when the speed of the generator increases?
What is the role of the fly-balls in the centrifugal governor system?
What is the role of the fly-balls in the centrifugal governor system?
When the sleeve moves upward, what happens to the piston rod of the control valve?
When the sleeve moves upward, what happens to the piston rod of the control valve?
What effect does closing valve V have on the rate of flow of water to the turbine?
What effect does closing valve V have on the rate of flow of water to the turbine?
How does increasing the area of flow of water at the outlet of the nozzle affect the speed of the turbine?
How does increasing the area of flow of water at the outlet of the nozzle affect the speed of the turbine?
What is the purpose of a draft-tube in a turbine?
What is the purpose of a draft-tube in a turbine?
What is the main function of governing in a turbine system?
What is the main function of governing in a turbine system?
Which type of draft-tube is known to be most efficient?
Which type of draft-tube is known to be most efficient?
What happens if a reaction turbine is not fitted with a draft-tube?
What happens if a reaction turbine is not fitted with a draft-tube?
Why is it important to keep the speed of a turbine constant?
Why is it important to keep the speed of a turbine constant?
How does governing help in maintaining constant speed of a turbine?
How does governing help in maintaining constant speed of a turbine?
What drives the gear pump in an oil pressure governor for a Pelton turbine?
What drives the gear pump in an oil pressure governor for a Pelton turbine?
Which element is responsible for driving the centrifugal governor in governing a Pelton turbine?
Which element is responsible for driving the centrifugal governor in governing a Pelton turbine?
What part of an oil pressure governor receives power from the turbine shaft?
What part of an oil pressure governor receives power from the turbine shaft?
