Gas Turbine 2024/2025 questions and answers | verified
What are the two common forms of blade roots? - Fir tree and bulb
How do the high-velocity, high-temperature gases cause the rotor of a gas turbine to rotate? - By
transferring velocity energy and thermal energy to the turbine blades
A gas turbine in which exhaust gas heat energy is added to the air charge between the compressor and
combustion chamber is classified as a/an? - Regenerative cycle engine.
Which of the following is an advantage of a single-shaft GTE compared to a split Shaft GTE? -
Fewer moving parts
What type of seal is used in the gearbox of a GTE? - Carbon Ring
What type of starter is commonly used on smaller GTEs? - Electric
The term "Lockout" on the Synchro-self-shifting (SSS) clutch system means that the - SSS clutch
will not engage
Where are the CO2 nozzles located on the LM2500 enclosure? - On the cross beam under the
compressor front frame
What is the primary purpose of the diffuser and the distributor on the LM2500 GTE? - To provide
uniform airflow to the combustor
How is the HP Turbine rotor of the LM2500 GTE cooled? - By a continuous flow of compressor
discharge air
In the marine gas turbine shown in the illustration, the 13th stage bleed air is used for - High
pressure turbine 2nd stage nozzle cooling
, In the marine gas turbine engine shown in the illustration, the HP Turbine 2nd stage nozzle vanes are
cooled by - 13th stage compressor air
Boyle's law can beat be defined as - The volume of an enclosed gas varies inversely with the
applied pressure, provided the temperature remains constant
The term used to describe the gas turbine in which air drawn from the atmosphere passes through the
engine only once is which of the following - Open cycle
A gas turbine that has a re-generator between the compression and combustion sections in which
exhaust gas heat energy is added to the air charge is classified as what type of engine? - Semi-
closed cycle engine
The term used to describe the gas turbine in which the turbine exhaust passes through a cooler and back
to the compressor inlet is which of the following - Closed cycle
What type of gas turbine cycle configuration as shown in the illustration, see illustration GT-0031 -
Inter-cooled recuperated type
In a regenerative or recuperative gas turbine cycle configuration the heat of the turbine exhaust gases is
used to do what? - Heat the compressor discharge air before it enters the combustor
Which of the following statements about the intercooled recuperated gas turbine cycle is true? See
illustration GT-0031 - The intercooler Serge to reduce their required high-pressure compressor
power while the recuperator utilizes waste heat from the exhaust to decrease required Fuel to achieve
the turbine inlet temperature
For shipboard mean propulsion application, how does a intercooled recuperated cycle gas turbine
configuration compare to a combined cycle gas turbine configuration? - Although the ICR cycle
configuration is lower in efficiency, it is lighter takes up less space than a combined cycle configuration
What are the two common forms of blade roots? - Fir tree and bulb
How do the high-velocity, high-temperature gases cause the rotor of a gas turbine to rotate? - By
transferring velocity energy and thermal energy to the turbine blades
A gas turbine in which exhaust gas heat energy is added to the air charge between the compressor and
combustion chamber is classified as a/an? - Regenerative cycle engine.
Which of the following is an advantage of a single-shaft GTE compared to a split Shaft GTE? -
Fewer moving parts
What type of seal is used in the gearbox of a GTE? - Carbon Ring
What type of starter is commonly used on smaller GTEs? - Electric
The term "Lockout" on the Synchro-self-shifting (SSS) clutch system means that the - SSS clutch
will not engage
Where are the CO2 nozzles located on the LM2500 enclosure? - On the cross beam under the
compressor front frame
What is the primary purpose of the diffuser and the distributor on the LM2500 GTE? - To provide
uniform airflow to the combustor
How is the HP Turbine rotor of the LM2500 GTE cooled? - By a continuous flow of compressor
discharge air
In the marine gas turbine shown in the illustration, the 13th stage bleed air is used for - High
pressure turbine 2nd stage nozzle cooling
, In the marine gas turbine engine shown in the illustration, the HP Turbine 2nd stage nozzle vanes are
cooled by - 13th stage compressor air
Boyle's law can beat be defined as - The volume of an enclosed gas varies inversely with the
applied pressure, provided the temperature remains constant
The term used to describe the gas turbine in which air drawn from the atmosphere passes through the
engine only once is which of the following - Open cycle
A gas turbine that has a re-generator between the compression and combustion sections in which
exhaust gas heat energy is added to the air charge is classified as what type of engine? - Semi-
closed cycle engine
The term used to describe the gas turbine in which the turbine exhaust passes through a cooler and back
to the compressor inlet is which of the following - Closed cycle
What type of gas turbine cycle configuration as shown in the illustration, see illustration GT-0031 -
Inter-cooled recuperated type
In a regenerative or recuperative gas turbine cycle configuration the heat of the turbine exhaust gases is
used to do what? - Heat the compressor discharge air before it enters the combustor
Which of the following statements about the intercooled recuperated gas turbine cycle is true? See
illustration GT-0031 - The intercooler Serge to reduce their required high-pressure compressor
power while the recuperator utilizes waste heat from the exhaust to decrease required Fuel to achieve
the turbine inlet temperature
For shipboard mean propulsion application, how does a intercooled recuperated cycle gas turbine
configuration compare to a combined cycle gas turbine configuration? - Although the ICR cycle
configuration is lower in efficiency, it is lighter takes up less space than a combined cycle configuration
