GSM 3 STUDY GUIDE WITH VERIFIED
SOLUTIONS
In a gas turbine engine, specific components are designed to perform each function
seperately, these functions are known as? - Correct Answers -Intake, compression,
combustion, expansion, and exhaust
A GTE turbine nozzle consists of? - Correct Answers -A stator ring and a series of
vanes
What is the function of the inlet section on a GTE? - Correct Answers -Directs air into
the compressor
How is a GTE classified? - Correct Answers -Bu thpe of compressir and direction of
airflow
What are the two principal types of GTE compressors? - Correct Answers -Centrifugal
and acial-flow type
How long must a GTE be colled prior to commencing water washing? - Correct Answers
-1 hour
Ater waterwashing a GTE the engine must remain idke for what period of time? -
Correct Answers -5 minutes
How is a GTE classified? - Correct Answers -By type of compressor and direction of
airflow
What determines whether a GTE is of the axial flow type or the centrifugal-flow type? -
Correct Answers -It is dependant on the airflow leaving the compressor rotor
What are the three advantages of a centrifugal-flow type GTE? - Correct Answers -1)
Rugged, simple in design
2) Light in weight
3) develops a high pressure ratio per stage
The two main elements of an axial-flow type GTE are? - Correct Answers -The rotor and
the stator
Most present day axial-flow type GTE's have how many stages? - Correct Answers -8 to
16.
, Rotor blades are attached to the rotor disk rim by what methods? - Correct Answers -
Bulb or fir-tree root
An inlet pressure of 14.7 psia will be compressed to what pressure in the first stage of
an axial-flow GTE? - Correct Answers -17.64 psi
How is compressor surge controlled on a constant-speed axial flow GTE? - Correct
Answers -By proper fuel scheduling and use of bleed valves
Annular and can-annular combustion chambers are found on what type of GTE? -
Correct Answers -Axial-flow type
Centrifugal-flow type GTEs use what type of combustion chamber? - Correct Answers -
Can-type
What type of thermocouples are used in GTGs - Correct Answers -Chromel-Alumel,
duel element
Where are the GTGs water-wash spray nozzles located? - Correct Answers -In the
forward wall of the inlet plenum
What is the set point for the automatic solenoid on the GTG blow-in door? - Correct
Answers -8 inches of water
Wha is provided to drain water from the exhaust duct system? - Correct Answers -A
seawater trap
What detects the presence of fire in a gas turbine module? - Correct Answers -An
ultraviolet flame detector
How is a voltmeter always connected? - Correct Answers -In parallel
GTE rotors are usually supported by what types of bearings? - Correct Answers -Ball or
roller type
What are three types of GTE air seals? - Correct Answers -Labyrinth, honeycomb, and
fishmouth
What are three types of oil seals associated with a GTE? - Correct Answers -Lip-type,
labyrinth, and carbon rings
Wha type of oil seal has a serrated surface with a stationary seal having wingback
threads and a smooth surface? - Correct Answers -Labyrinth seal
What are three types of GTE shafts used in the navy? - Correct Answers -Single shaft,
split shaft, and twin spool
SOLUTIONS
In a gas turbine engine, specific components are designed to perform each function
seperately, these functions are known as? - Correct Answers -Intake, compression,
combustion, expansion, and exhaust
A GTE turbine nozzle consists of? - Correct Answers -A stator ring and a series of
vanes
What is the function of the inlet section on a GTE? - Correct Answers -Directs air into
the compressor
How is a GTE classified? - Correct Answers -Bu thpe of compressir and direction of
airflow
What are the two principal types of GTE compressors? - Correct Answers -Centrifugal
and acial-flow type
How long must a GTE be colled prior to commencing water washing? - Correct Answers
-1 hour
Ater waterwashing a GTE the engine must remain idke for what period of time? -
Correct Answers -5 minutes
How is a GTE classified? - Correct Answers -By type of compressor and direction of
airflow
What determines whether a GTE is of the axial flow type or the centrifugal-flow type? -
Correct Answers -It is dependant on the airflow leaving the compressor rotor
What are the three advantages of a centrifugal-flow type GTE? - Correct Answers -1)
Rugged, simple in design
2) Light in weight
3) develops a high pressure ratio per stage
The two main elements of an axial-flow type GTE are? - Correct Answers -The rotor and
the stator
Most present day axial-flow type GTE's have how many stages? - Correct Answers -8 to
16.
, Rotor blades are attached to the rotor disk rim by what methods? - Correct Answers -
Bulb or fir-tree root
An inlet pressure of 14.7 psia will be compressed to what pressure in the first stage of
an axial-flow GTE? - Correct Answers -17.64 psi
How is compressor surge controlled on a constant-speed axial flow GTE? - Correct
Answers -By proper fuel scheduling and use of bleed valves
Annular and can-annular combustion chambers are found on what type of GTE? -
Correct Answers -Axial-flow type
Centrifugal-flow type GTEs use what type of combustion chamber? - Correct Answers -
Can-type
What type of thermocouples are used in GTGs - Correct Answers -Chromel-Alumel,
duel element
Where are the GTGs water-wash spray nozzles located? - Correct Answers -In the
forward wall of the inlet plenum
What is the set point for the automatic solenoid on the GTG blow-in door? - Correct
Answers -8 inches of water
Wha is provided to drain water from the exhaust duct system? - Correct Answers -A
seawater trap
What detects the presence of fire in a gas turbine module? - Correct Answers -An
ultraviolet flame detector
How is a voltmeter always connected? - Correct Answers -In parallel
GTE rotors are usually supported by what types of bearings? - Correct Answers -Ball or
roller type
What are three types of GTE air seals? - Correct Answers -Labyrinth, honeycomb, and
fishmouth
What are three types of oil seals associated with a GTE? - Correct Answers -Lip-type,
labyrinth, and carbon rings
Wha type of oil seal has a serrated surface with a stationary seal having wingback
threads and a smooth surface? - Correct Answers -Labyrinth seal
What are three types of GTE shafts used in the navy? - Correct Answers -Single shaft,
split shaft, and twin spool
