40 Questions
What is the main function of a steam turbine?
Convert thermal energy of steam into mechanical energy
What is the first step in the operation of a steam turbine?
Steam generation
How does the expansion of steam contribute to the operation of a steam turbine?
Causes the turbine blades to rotate
What is the final product after the mechanical energy generated by the turbine?
Electrical energy
Which part of a steam turbine is responsible for converting the rotational energy to electrical energy?
Turbine shaft
In the operation of a steam turbine, what drives the rotation of the turbine rotor?
High-pressure steam flow
What happens to the pressure in the nozzle as steam passes through it?
Drops
Which type of turbine has relatively low efficiency despite a lower initial cost?
Impulse Turbine
What is the key advantage of a velocity compounded impulse turbine with few stages?
Small heat drop
Which type of turbine requires a large number of stages but is the most efficient?
Pressure Compounding Turbine
In a pressure compounding turbine, what happens to the steam pressure as it passes through each stage?
Decreases
What material is typically used for cylinders in a single row wheel due to high steam temperature?
Cast Steel
What is the main disadvantage of velocity compounding impulse turbines with a single row wheel?
High material cost
Which turbine method combines both pressure and velocity compounding techniques?
Pressure-Velocity Compounding Turbine
In pressure velocity compounding, what remains constant during each stage?
Steam pressure
What is the function of the fixed blades in a reaction turbine stage?
Redirect the steam flow without altering its velocity
What is the primary objective of governing a steam turbine?
To control and regulate speed and power output
What are some common types of losses in steam turbines?
Exhaust Losses
Which type of losses occur due to friction between moving parts like rotor blades and stationary parts like the casing in a steam turbine?
Frictional Losses
What is the function of insulation in steam turbines?
To reduce heat losses
Which governing system for steam turbines focuses on controlling the power output or load of the turbine?
Load Governing
In throttle governing of steam turbines, what is the primary purpose of throttling the steam?
To maintain speed when there is a reduction of load
What is one of the main governing devices used in steam turbines for precise regulation?
Speed Sensors
What does governing of a steam turbine involve?
"Throttling" the steam as needed
How do engineers and researchers aim to improve turbine efficiency?
By reducing heat losses
What is the main difference between nozzle control governing and throttle governing in a steam turbine?
In nozzle control, the supply of steam to nozzle groups is varied based on load changes, while in throttle governing the valve simply opens or closes.
What happens in a steam turbine governed by bypass regulation when additional steam is required above the economic load?
A secondary valve opens, allowing steam to bypass to lower stages in the turbine.
What is the purpose of Willan's line in the context of a steam turbine governed by throttling?
To demonstrate how steam consumption changes with load in throttling-governed turbines.
In nozzle control governing, why is it important that the valves remain fully open under full load conditions?
To ensure that all nozzles are operational for maximum efficiency.
What effect does by-pass regulation have on the work output in lower stages of a steam turbine?
It increases work output by diverting steam from higher stages.
Why can nozzle control governing only be applied to the first stage of a turbine?
Because subsequent stages do not have individual nozzle groups.
What is the fundamental concept behind steam turbines?
Converting heat energy into mechanical energy
In which type of turbine does a gradual pressure drop continuously occur over the fixed and moving blades?
Reaction turbine
What is the primary function of the fixed blades in a reaction turbine?
Alter the direction of the steam
What is responsible for the loss of energy known as 'leaving loss' in a simple impulse turbine?
High exit velocity
How does a simple impulse turbine differ from a reaction turbine?
Simple impulse turbines expand steam in nozzles only
What is the name of the famous turbine mentioned as an example of a simple impulse turbine?
'De laval turbine'
Which method is used to reduce the tremendous rotor speed in steam turbines?
'Compounding'
What are the two main components involved in compounding methods for reducing rotor speed?
'Multiple rotors in series'
Why does the diameter of a reaction turbine increase after each group of blade rings?
To accommodate higher volume of steam at lower pressures
Test your knowledge of steam turbines and their operation. Learn about how steam turbines convert thermal energy into mechanical energy to drive electrical generators.
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