WorksheetsIGT PO4.1&4.2
Total questions: 36
Worksheet time: 36mins
What is the purpose of the combustion chamber?
To filter air
To cool the metal parts
To burn the mixture of air and fuel
To store fuel
Which component is responsible for controlling the amount of fuel in the combustion chamber?
Combustion Liner
Transition Piece
Fuel Nozzle
Spark Plugs
What is the function of the ultraviolet flame detectors?
To ignite the fuel
To cool the combustion chamber
To mix fuel and air
To indicate the presence or absence of flame
What is the main purpose of the combustion liner?
To control fuel flow
To link the hot gas path
To contain and direct the combustion process
To detect flame presence
How is the inspection of the combustion liner typically carried out?
Using a Borescope
By removing the entire chamber
Using a thermal camera
By visual inspection only
What is the role of the transition piece in the combustion section?
To ignite the fuel
To filter the air
To link the hot gas path between combustion chambers and turbine
To cool the combustion gases
What percentage of air participates in the combustion process?
75% - 80%
10% - 15%
20% - 25%
50% - 60%
What is the purpose of the spark plugs in the combustion chamber?
To provide a place for an electric spark
To mix fuel and air
To detect flame presence
To cool the combustion gases
What happens if the flame is not detected by the flame sensor?
The turbine will continue to operate
It will inhibit further progress of the turbine start-up sequence
The combustion chamber will cool down
The fuel supply will be increased
What is the main function of the cross fire tubes?
To filter the air
To ignite the fuel
To allow for the cross-flow of combustion gases
To cool the combustion gases
What is the main purpose of cooling the gases before entering the turbine?
To increase pressure
To reduce temperature to safe limits
To improve fuel efficiency
To enhance combustion
What is the consequence of blocked cooling holes in the combustion liner?
Potential damage and unsafe operating conditions
Reduced maintenance costs
Increased fuel efficiency
Improved combustion efficiency
What is the primary function of the fuel nozzles?
To control the amount of fuel in the combustion chamber
To ignite the fuel
To detect flame presence
To cool the combustion chamber
What is the purpose of the combustion section in a gas turbine?
To store fuel
To cool the turbine
To mix air and fuel
To burn fuel and produce hot gases for the turbine
What is the typical temperature of gases from the combustion process?
540°C
1100°C
1900°C
2500°C
What is the primary purpose of the fuel-air mixing process in the combustion chamber?
To ensure complete combustion
To reduce emissions
To increase fuel efficiency
To cool the combustion gases
What is the effect of excessive fuel flow in the combustion chamber?
Increased efficiency
Higher emissions and potential damage
Lower operating temperatures
Improved flame stability
How does the design of the combustion chamber influence turbine performance?
By affecting the pressure drop
By controlling the flame temperature
By determining the fuel type used
By influencing the air intake
What is the impact of insufficient air supply on the combustion process?
It will enhance combustion efficiency
It may lead to incomplete combustion
It will have no effect on combustion
It will increase the flame temperature
What role do fuel injectors play in the combustion process?
To ignite the fuel
To atomize and distribute fuel evenly
To cool the combustion chamber
To monitor flame presence
What is the main requirement for fuel used in a gas turbine?
High sulfur content
High viscosity
Low ignition temperature
High heating value
Which of the following is NOT a type of fuel mentioned?
Liquid Fuel
Solid Fuel
Synthetic Fuel
Gaseous Fuel
What does HHV stand for in the context of fuel?
Heat Harmonic Value
Hydrogen Heating Value
High Heat Volume
High Heating Value
What is the significance of the Lower Heating Value (LHV)?
It indicates the fuel's ignition temperature.
It is important for practical efficiency calculations.
It measures the total energy content of the fuel.
It is used for theoretical maximum energy calculations.
What is a critical factor for the cleanliness of fuel?
High particulate matter
Low sulfur content
High water content
High viscosity
What is the maximum allowable contamination limit for solid particles in liquid fuel?
5 grams/1000 gal
10 grams/1000 gal
8 grams/1000 gal
15 grams/1000 gal
What is the purpose of having a low ignition temperature for fuel?
To increase viscosity
To ignite reliably under turbine conditions
To ensure high energy content
To reduce emissions
Which of the following is a requirement for the consistency of heat input to the turbine?
Fuel metering valve must not exceed 71°C
Supply temperature must be greater than 65°C
Supply temperature must be more than 55⁰C
Fuel metering valve must not exceed 93°C
What is the maximum viscosity allowed at the engine fuel shut-off valve?
20 centistokes
15 centistokes
10 centistokes
5 centistokes
What is the main component that fuels consist of?
Carbon
Helium
Nitrogen
Oxygen
What is the role of sulfur content in fuel?
To increase heating value
To reduce emissions and prevent corrosion
To enhance combustion stability
To improve fuel viscosity
What is a requirement for the storage and handling of fuel?
It must contain high levels of contaminants
It must be unstable
It should be compatible with existing systems
It should have high deposition tendencies
What is the purpose of having low deposition and fouling tendencies?
To increase fuel viscosity
To prevent clogging and erosion of turbine blades
To enhance the heating value
To improve ignition temperature
Which of the following fuels is classified as a gaseous fuel?
Coal
Distillate
Natural gas
Light crude
What is the primary advantage of using natural gas as a fuel?
Lower emissions compared to other fossil fuels
Higher viscosity
Higher sulfur content
Lower heating value
Which of the following is a characteristic of a good fuel for combustion?
High moisture content
Low energy density
High volatility
High carbon content
