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Questions and Answers
What is the main function of a turbine?
What is the main function of a turbine?
- Convert electrical energy into hydraulic energy
- Convert hydraulic energy into electrical energy
- Convert hydraulic energy into mechanical energy (correct)
- Convert mechanical energy into hydraulic energy
What is the difference between Gross Head and Net Head in a turbine system?
What is the difference between Gross Head and Net Head in a turbine system?
- Gross Head accounts for all losses; Net Head considers only friction losses.
- Net Head is the total head; Gross Head is the available head at the turbine inlet.
- Net Head is the head when no water is flowing; Gross Head is the available head at the turbine inlet.
- Gross Head includes friction losses; Net Head is the effective head at the turbine inlet. (correct)
Which loss is primarily considered when calculating the Net Head on a turbine?
Which loss is primarily considered when calculating the Net Head on a turbine?
- Loss at the entrance of the penstock
- Head loss due to friction between water and penstocks (correct)
- Loss due to bends in the penstocks
- Loss due to pipe fittings
What is the formula to calculate the Net Head on a turbine?
What is the formula to calculate the Net Head on a turbine?
Why is hydroelectric power considered one of the cheapest forms of power generation?
Why is hydroelectric power considered one of the cheapest forms of power generation?
Which term refers to the hydraulic machines converting hydraulic energy into electrical energy?
Which term refers to the hydraulic machines converting hydraulic energy into electrical energy?
What type of turbine is characterized by the water flowing through the runner along the direction parallel to the axis of rotation?
What type of turbine is characterized by the water flowing through the runner along the direction parallel to the axis of rotation?
Which part of a Pelton turbine controls the amount of water striking the buckets of the runner?
Which part of a Pelton turbine controls the amount of water striking the buckets of the runner?
What is the purpose of the casing in a Pelton turbine?
What is the purpose of the casing in a Pelton turbine?
Which type of flow impulse turbine is the Pelton wheel?
Which type of flow impulse turbine is the Pelton wheel?
What does the breaking jet do in a Pelton turbine?
What does the breaking jet do in a Pelton turbine?
How are the buckets of a Pelton wheel shaped?
How are the buckets of a Pelton wheel shaped?
What happens when the spear in the nozzle of a Pelton turbine is pushed forward?
What happens when the spear in the nozzle of a Pelton turbine is pushed forward?
Which type of turbine is characterized by water flowing from outwards to inwards, radially?
Which type of turbine is characterized by water flowing from outwards to inwards, radially?
'Velocity Triangles and Work done for Pelton Wheel' section is associated with what location on the Pelton wheel?
'Velocity Triangles and Work done for Pelton Wheel' section is associated with what location on the Pelton wheel?
'Breaking Jet' is provided in a Pelton turbine to primarily address which issue?
'Breaking Jet' is provided in a Pelton turbine to primarily address which issue?
What is the formula for hydraulic efficiency of a turbine?
What is the formula for hydraulic efficiency of a turbine?
How is mechanical efficiency of a turbine mathematically expressed?
How is mechanical efficiency of a turbine mathematically expressed?
What does volumetric efficiency of a turbine represent?
What does volumetric efficiency of a turbine represent?
What is the formula for overall efficiency of a turbine?
What is the formula for overall efficiency of a turbine?
What classification criterion is used for hydraulic turbines based on energy at inlet?
What classification criterion is used for hydraulic turbines based on energy at inlet?
Which type of turbine has water under pressure and converts pressure energy into kinetic energy as it flows through?
Which type of turbine has water under pressure and converts pressure energy into kinetic energy as it flows through?
In a reaction turbine, what happens to pressure energy as water flows through?
In a reaction turbine, what happens to pressure energy as water flows through?
What distinguishes tangential flow turbines from other types of hydraulic turbines?
What distinguishes tangential flow turbines from other types of hydraulic turbines?
What occurs in a mixed flow turbine?
What occurs in a mixed flow turbine?
Which head category does a low head turbine belong to?
Which head category does a low head turbine belong to?
What happens to the turbine speed when the load on the generator decreases?
What happens to the turbine speed when the load on the generator decreases?
How does the control valve respond when the centrifugal governor rotates at an increased speed?
How does the control valve respond when the centrifugal governor rotates at an increased speed?
What effect does the movement of the fly-balls have on the sleeve?
What effect does the movement of the fly-balls have on the sleeve?
How does the control valve react when the sleeve moves upward?
How does the control valve react when the sleeve moves upward?
Which direction does the piston move when oil under pressure is exerted on face A?
Which direction does the piston move when oil under pressure is exerted on face A?
What is the result of increasing the area of flow of water at the outlet of the nozzle?
What is the result of increasing the area of flow of water at the outlet of the nozzle?
What is the purpose of the draft tube in a turbine?
What is the purpose of the draft tube in a turbine?
In a Francis Turbine, what is the flow ratio defined as?
In a Francis Turbine, what is the flow ratio defined as?
What type of turbine is suitable for a large quantity of water at low head?
What type of turbine is suitable for a large quantity of water at low head?
What is the significance of the hub in an axial flow reaction turbine?
What is the significance of the hub in an axial flow reaction turbine?
What characteristic distinguishes a Kaplan Turbine from a Propeller Turbine?
What characteristic distinguishes a Kaplan Turbine from a Propeller Turbine?
What does the design of a Pelton Wheel involve determining?
What does the design of a Pelton Wheel involve determining?
What type of turbine has water entering and leaving in the axial direction?
What type of turbine has water entering and leaving in the axial direction?
What is the name given to an inward flow reaction turbine with radial discharge at outlet?
What is the name given to an inward flow reaction turbine with radial discharge at outlet?
What is one purpose served by establishing a negative head at the outlet of the runner using a draft tube?
What is one purpose served by establishing a negative head at the outlet of the runner using a draft tube?
What parameter does the speed ratio represent for Francis Turbines?
What parameter does the speed ratio represent for Francis Turbines?
What is the purpose of a draft-tube in a turbine?
What is the purpose of a draft-tube in a turbine?
Why is governing of a turbine necessary?
Why is governing of a turbine necessary?
What happens to the pressure at the outlet of a runner if a reaction turbine is not fitted with a draft-tube?
What happens to the pressure at the outlet of a runner if a reaction turbine is not fitted with a draft-tube?
What is the primary role of a governor in governing a turbine?
What is the primary role of a governor in governing a turbine?
Which type of draft-tube requires less space compared to others?
Which type of draft-tube requires less space compared to others?
What drives the gear pump in an oil pressure governor for Pelton turbines?
What drives the gear pump in an oil pressure governor for Pelton turbines?
What does a spear rod or needle do in an oil pressure governor for Pelton turbines?
What does a spear rod or needle do in an oil pressure governor for Pelton turbines?
How does a draft-tube impact the net head on a turbine?
How does a draft-tube impact the net head on a turbine?
What term is used to describe keeping the speed of a turbine constant under all conditions of working?
What term is used to describe keeping the speed of a turbine constant under all conditions of working?
Why is it important for an electric generator to run at a constant speed under all fluctuating load conditions?
Why is it important for an electric generator to run at a constant speed under all fluctuating load conditions?
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