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Questions and Answers
What is the hydraulic efficiency of a turbine defined as?
What is the hydraulic efficiency of a turbine defined as?
- The ratio of power available at the shaft to the power delivered to the runner
- The ratio of power supplied by water to the power available at the shaft
- The ratio of power delivered to the runner to the power supplied by water at the inlet (correct)
- The ratio of power supplied by water to the power delivered to the runner
What is the main cause of power decrease from the inlet to the outlet of a turbine?
What is the main cause of power decrease from the inlet to the outlet of a turbine?
- Hydraulic losses (correct)
- Electrical losses
- Volumetric losses
- Mechanical losses
What is the mechanical efficiency of a turbine defined as?
What is the mechanical efficiency of a turbine defined as?
- The ratio of power delivered to the runner to the power supplied by water at the inlet
- The ratio of power supplied by water to the power available at the shaft
- The ratio of power at the shaft to the power delivered to the runner (correct)
- The ratio of power available at the shaft to the power supplied by water at the inlet
What is the volumetric efficiency of a turbine defined as?
What is the volumetric efficiency of a turbine defined as?
What is the overall efficiency of a turbine defined as?
What is the overall efficiency of a turbine defined as?
How are hydraulic turbines classified according to the type of energy available at the inlet?
How are hydraulic turbines classified according to the type of energy available at the inlet?
What is the characteristic of a tangential flow turbine?
What is the characteristic of a tangential flow turbine?
What is the purpose of the air-tight casing in a reaction turbine?
What is the purpose of the air-tight casing in a reaction turbine?
What is the result of hydraulic losses in a turbine?
What is the result of hydraulic losses in a turbine?
What is the factor that affects the classification of hydraulic turbines according to the specific speed?
What is the factor that affects the classification of hydraulic turbines according to the specific speed?
What is the width of the buckets of a Pelton wheel in relation to the diameter of the jet?
What is the width of the buckets of a Pelton wheel in relation to the diameter of the jet?
What is the direction of water flow at the outlet of a Francis turbine?
What is the direction of water flow at the outlet of a Francis turbine?
What is the purpose of the draft tube in a Kaplan turbine?
What is the purpose of the draft tube in a Kaplan turbine?
What type of turbine is characterized by radial discharge at the outlet?
What type of turbine is characterized by radial discharge at the outlet?
What is the name of the Austrian engineer who designed the Kaplan turbine?
What is the name of the Austrian engineer who designed the Kaplan turbine?
What is the term for the ratio of the width of the wheel to its diameter in a Francis turbine?
What is the term for the ratio of the width of the wheel to its diameter in a Francis turbine?
What is the direction of water flow in an axial flow reaction turbine?
What is the direction of water flow in an axial flow reaction turbine?
What is the purpose of the guide vanes mechanism in a Kaplan turbine?
What is the purpose of the guide vanes mechanism in a Kaplan turbine?
What is the term for the velocity of whirl at the outlet of a Francis turbine?
What is the term for the velocity of whirl at the outlet of a Francis turbine?
What is the name of the turbine that is suitable for a large quantity of water at low head?
What is the name of the turbine that is suitable for a large quantity of water at low head?
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?
What is the effect of the increased centrifugal force on the fly-balls?
What is the effect of the increased centrifugal force on the fly-balls?
What happens to the valve V when the sleeve moves upward?
What happens to the valve V when the sleeve moves upward?
What is the effect of the decrease in the area of flow of water at the outlet of the nozzle?
What is the effect of the decrease in the area of flow of water at the outlet of the nozzle?
What happens to the piston rod of the control valve when the sleeve moves downward?
What happens to the piston rod of the control valve when the sleeve moves downward?
What is the effect of the increase in the area of flow of water at the outlet of the nozzle?
What is the effect of the increase in the area of flow of water at the outlet of the nozzle?
What is the primary function of turbines?
What is the primary function of turbines?
Which term defines the head difference between the head race level and tail race level?
Which term defines the head difference between the head race level and tail race level?
What is the electric power obtained from hydraulic energy known as?
What is the electric power obtained from hydraulic energy known as?
What is the efficiency of a turbine that accounts for losses such as friction, bends, and pipe fittings?
What is the efficiency of a turbine that accounts for losses such as friction, bends, and pipe fittings?
Which term represents the head available at the inlet of the turbine?
Which term represents the head available at the inlet of the turbine?
How is the net head on a turbine calculated?
How is the net head on a turbine calculated?
What type of turbine is a Pelton wheel?
What type of turbine is a Pelton wheel?
In which direction does water flow in an inward radial flow turbine?
In which direction does water flow in an inward radial flow turbine?
What regulates the amount of water striking the buckets of a Pelton wheel?
What regulates the amount of water striking the buckets of a Pelton wheel?
What part of the Pelton turbine prevents the splashing of water?
What part of the Pelton turbine prevents the splashing of water?
What directs the jet of water on the back of the vanes to stop the Pelton wheel in a short time?
What directs the jet of water on the back of the vanes to stop the Pelton wheel in a short time?
What divides the jet of water into two equal parts in a Pelton wheel?
What divides the jet of water into two equal parts in a Pelton wheel?
Which material are the buckets of a Pelton wheel typically made of?
Which material are the buckets of a Pelton wheel typically made of?
Where does the water strike the bucket in a Pelton wheel?
Where does the water strike the bucket in a Pelton wheel?
What is the primary energy form at the inlet of a Pelton wheel?
What is the primary energy form at the inlet of a Pelton wheel?
What is the purpose of the nozzle in a Pelton turbine?
What is the purpose of the nozzle in a Pelton turbine?
Why is a draft-tube used in turbines?
Why is a draft-tube used in turbines?
What happens to the pressure at the outlet of a reaction turbine without a draft-tube?
What happens to the pressure at the outlet of a reaction turbine without a draft-tube?
What is the main purpose of governing a turbine?
What is the main purpose of governing a turbine?
Which type of draft-tube is considered most efficient?
Which type of draft-tube is considered most efficient?
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?
What purpose does the control valve serve in an oil pressure governor for a Pelton turbine?
What purpose does the control valve serve in an oil pressure governor for a Pelton turbine?
Why is governing of a turbine essential when it is coupled to an electric generator?
Why is governing of a turbine essential when it is coupled to an electric generator?
What happens to the speed of the turbine if there is a decrease in load on the generator?
What happens to the speed of the turbine if there is a decrease in load on the generator?
Which type of draft-tube requires less space compared to other types?
Which type of draft-tube requires less space compared to other types?
What drives the centrifugal governor or pendulum in a Pelton turbine system?
What drives the centrifugal governor or pendulum in a Pelton turbine system?
