Gas Turbine - 1st Asst/Chief

How do you gain access to the burner units of a can-annular combustor to perform maintenance?

Boyle's law can best be defined as which of the following?

On the gas turbine shown in the illustration, which of the following best describes the main principle of operation of t...

In the operation of a marine propulsion gas turbine, kinetic and thermal energy required to drive the main propeller sha...

On a gas turbine propulsion vessel, you notice a slow but steady increase in gas turbine vibration and specific fuel con...

On a gas turbine powered vessel, what is the last step after an off-line water wash?

The effectiveness of an off-line wash wash of a LM2500 gas turbine engine can be enhanced by doing which of the followin...

When conducting a borescope inspection of the compressor, why can airfoil and tip cracks be difficult to detect?

Zero reference for the GE LM2500 gas turbine engine is established by the use of which of the following engine component...

On an GE LM2500 gas turbine powered vessel you are conducting a borescope inspection of the compressor. What is used on ...

Which of the following statements about the intercooled-recuperated gas turbine cycle is true? Illustration GT-0031 ...

For the same amount of available power, how does a low speed two-stroke diesel engine compare to a recuperated gas turbi...

In a regenerative or recuperative gas turbine cycle configuration, the heat of the turbine exhaust gas is used to do wha...

What type of gas turbine cycle configuration is shown in the illustration? Illustration GT-0031

Compressor tip clang can be usually attributed to which of the following operating conditions?

Once a compressor is broken in, which of the following factors will most likely cause blade tips to rub?

What type of metallurgical failure does Item B represent in the illustration? Illustration GT-0014

Compressor rotor blade tip curl is usually caused by which of the following?

You are conducting a borescope inspection of the compressor section of a GE LM2500 gas turbine. In stage four, you see a...

When tip clang takes place on a gas turbine engine, the major damage occurs to what area of the blade?

A compressor blade platform that is tilted or raised may indicate which of the following failures?

What type of metallurgical failure does Item A represent in the illustration? Illustration GT-0014

Distortion of the combustor liner assembly is evident when you observe which of the following conditions?

You are conducting a borescope inspection of the combustor section of a GE LM2500 gas turbine engine. You observe a one ...

The dimples of a combustor dome band that has a low operating time will usually have what kind of damage?

What does the term "lockout" of a Synchro-Self-Shifting (SSS) clutch system mean? Illustration GT-0018

How is the clutch shown in the attached illustration engaged? Illustration GT-0018

On a gas turbine powered vessel equipped with a synchro self shifting (SSS) clutch, you are preparing for a power turbin...

On a ship with a marine gas turbine as shown in the illustration, a fire emergency stop is initiated when ______________...

If a fire is detected in a main propulsion gas turbine enclosure, which of the following would occur prior to automatic ...

On the marine gas turbine engine shown in the illustration, what temperature should be carefully monitored following a s...

A total of how many shock mounts are used to secure the LM2500 enclosure to the ship's foundation?

What is the primary purpose of the diffuser and distributor on the GE LM2500 gas turbine engine?

What is the purpose of the GE LM2500 gas turbine enclosure heater?

What type of combustor is used by the GE LM2500 gas turbine engine?

Where are the CO2 nozzles located in the GE LM2500 gas turbine enclosure?

The gas generator section of the GE LM2500 gas turbine engine is composed of all of the following components EXCEPT for ...

Which of the following components prevent(s) objects smaller than 1/4 inch from entering the engine?

How many stages are in the HP turbine of the GE LM2500 gas turbine engine?

The struts of the compressor front frame provide passages for all of the following mediums EXCEPT for which of the follo...

The power turbine (PT) of the GE LM2500 gas turbine engine has a total of how many stages?

How is the HP turbine rotor of the GE LM2500 gas turbine engine cooled?

If after reducing power to a gas turbine engine in response to a high lube oil supply temperature alarm, the temperature...

Which of the following is the most likely cause for the main propulsion gas turbine engine tripping during start up? ...

During an operation of a main propulsion gas turbine, the engine shuts down. Which of the following is the most probable...

What are the two prime sources of deposits that build up on compressor blades?

Which of the following components are installed in the lube oil system shown in the illustration? Illustration GT-0024 ...

How many lube oil sumps are installed on the marine gas turbine engine shown in the illustration? Illustration GT-0024 ...

Which of the following is true concerning the main engine lube oil system of the marine gas turbine shown in the illustr...

What type of main lube oil supply and scavenging pump is installed on the marine gas turbine engine shown in the illustr...

On a gas turbine engine, a high outside air temperature can cause high turbine inlet temperature, low mass/weight of air...

Assuming you maintain the same power output, how will a decrease in the compressor inlet air temperature effect a gas tu...

Assuming that the turbine inlet temperature of a gas turbine engine remains constant, which of the following operating p...

What action should you take if full power vibration limits are exceeded on a gas turbine engine?

The build-up of contamination in a gas turbine will cause all of the following conditions EXCEPT which of the following...

Why is safety-wiring, or lock wiring of gas turbine parts required?

You are preparing for a borescope inspection of a gas turbine engine. Prior to the inspection it is recommended that you...

To manually rotate the GE LM2500 gas turbine engine, you should use which of the following tools?

The lubrication principal used by the Kingsbury thrust bearing is which of the following?

The main thrust bearing directly positions which part(s) of the main reduction gear?

The purpose of the main reduction gear in a marine gas turbine propulsion installation is which of the following? ...

What type of main reduction gear arrangement prevents independent axial and rotational movement of the pinions?

A gas turbine that has a regenerator between the compression and combustion sections in which exhaust gas heat energy is...

The term used to describe a gas turbine in which the turbine exhaust passes through a cooler and back to the compressor ...

The term used to describe a gas turbine in which air drawn from the atmosphere passes through the engine only once is wh...

On the marine gas turbine shown in the illustration, the gas generator speed sensor is located where? Illustration GT-00...

Which of the following conditions will NOT be the result of a build-up of deposits in a gas turbine compressor?

A reddish-colored oxide usually forms on which of the following metals?

Cadmium and zinc coatings provide which of the following type of protection for the base metal?

Active corrosion on copper alloys is indicated by which of the following?

A white-gray powdery deposit can usually found on which of the following metals?

When dissimilar metals come in contact with a conductor, which of the following types of metal deterioration takes place...

What design feature is incorporated into the main propulsion gas turbine to eliminate compressor surge?

The two main types of "compressor" stalls are known as which of the following?

What is the designed compressor pressure ratio of the gas turbine compressor rotor shown in the illustration? Illustrati...

When inspecting the combustion section of a gas turbine engine, what wattage light source should you use?

A gas turbine engine is experiencing a high rate of corrosion in the hot section of the engine. Which of the following f...

During an operation of a gas turbine equipped with an intercooler and recuperator, a low combustion air temperature to t...

A fuel analysis report for a gas turbine propelled vessel indicates a calcium level in excess of 0.5 ppm. High calcium l...

When performing a static check to determine tooth contact, you should use which of the following compounds to coat the g...

In cases where both the pinion and gear teeth of the main reduction gear have been slightly indented by foreign material...

Gear backlash is best described as which of the following?

On the marine gas turbine engine panel shown in the illustration, which of the following conditions would prevent the au...

The purpose of the air shroud (swirl cup) around the tip of the fuel nozzle of an GE LM2500 gas turbine engine is which ...

How many fuel igniters would be installed on the marine gas turbine engine shown in the illustration? Illustration GT-00...

The fuel oil back pressure regulator on the fuel system shown in the illustration, returns fuel to the which of the foll...

The Main Fuel Control module used on a marine gas turbine engine as shown in the illustration, is responsible for managi...

The secondary passages on the gas turbine engine fuel nozzles shown in the illustration are designed to open at approxim...

What is the primary function of the main fuel control on the GE LM2500 gas turbine engine?

As shown in the illustration of a gas turbine fuel oil system, when the engine fuel oil valves are de-energized, the rem...

You are preparing for a borescope inspection of a GE LM2500 gas turbine engine. You are reviewing the correct geometric ...

When conducting a borescope inspection, you must be aware of all of the following factors EXCEPT which?

The six borescope ports located in the compressor rear frame casing of the marine propulsion gas turbine shown, can be u...

While underway on a ship with gas turbine engines, the most likely indication of an engine stall is which of the followi...

Which of the following is the most probable cause if, while underway, the main propulsion gas turbine air intake blow-in...

In which of the following ways can compressor surge cause excessive temperatures in the turbine section?

To prevent overheating of the illustrated turbine blade, which of the following fluids is circulated through it via the ...

As shown in the illustration, the HP turbine 2nd stage blades are cooled by convection, with the cooling air being disch...

In the marine gas turbine engine shown in the illustration, the 9th stage bleed air is used for which of the following? ...

In the marine gas turbine engine shown in the illustration, the 13th stage bleed air is used for which of the following?...

In the marine gas turbine engine shown in the illustration, the 13th stage bleed air is used for which of the following?...

In the marine gas turbine engine shown in the illustration, the HP turbine 1st stage nozzle vanes are cooled by which of...

In the marine gas turbine engine shown in the illustration, the HP turbine 2nd stage nozzle vanes are cooled by which of...

In order to get a ready indication for a normal start with a GE LM2500 marine gas turbine, what permissive(s) must be me...

Your first step in response to a gas turbine engine high lube oil sump temperature alarm would be which of the following...

Which of the following is the most probable cause for the sump oil to be excessively aerated on an aero-derivative main ...

Lubricating oil contamination in a gas turbine bearing oil sump will most likely come from which of the following?