Gas Turbine Systems Technician – Mechanical (GSM) A School Test 1 Practice

These questions are part of the practice quiz. Start practicing

• The LO cooler construction is which type of heat exchanger?
• The FO system provides what?
• How is fuel scheduling typically managed during engine start?
• Outline a normal shutdown sequence for a gas turbine.
• Name the primary sections of a stationary gas turbine engine and their general purposes.
• What is the purpose of labyrinth seals around the compressor shaft?
• Which entity provides system level information to ship operating personnel and other naval parties?
• What are typical starting limitations for gas turbine engines?
• Fuel contaminants can cause which problems in turbine operation?
• What is the main LO capacity measured in TEP?
• What does the condenser filter dehydrator do?
• How does the fuel control respond to changes in ambient conditions to maintain speed?
• Identify common causes of flameout and how to recover.
• How does inlet distortion affect compressor performance?
• How many LO relief valves are at each pump and what is their lift setting?
• What role do instrumentation readings such as RPM, ITT/EGT play in control?
• In a dry-sump lubrication system, what is the role of the external reservoir?
• What is the rated capacity of the fire pumps?
• What is surge margin in relation to compressor operation?
• In flameout scenarios, which component is primarily responsible for re-ignition?
• What does thermal growth mean in engine components, and how does it affect clearances?
• What is a typical consequence if turbine blade clearance is excessive?
• What is the starboard fuel capacity in engine room #1?
• What is engine pressure ratio (EPR) and how is it used?
• The LO cooler is of which type?
• The LP air system provides air throughout the ship for which purposes?
• Borescope inspection in gas turbine maintenance is primarily used to:
• Which description best matches the LPAC's compressor design?
• Why might a fuel preheater be used in a gas turbine installation?
• What is the normal operating capacity of the LO sumo on the port side?
• The fire pump location includes which of the following spaces?
• What does EGT measure and why is it important?
• In a two-spool gas turbine, which statement is true about the LP and HP compressors?
• Which seal type is commonly used to prevent oil leakage in the turbine lubrication system?
• During start, which parameter is a critical limit to avoid engine damage?
• What are the LPAC lead, standby, and emergency pressures for LPAC air?
• Which statement correctly describes compressor inlet pressure, compressor discharge pressure, and their relation to Engine Pressure Ratio (EPR)?
• Why is compressor stability margin important?
• Fuel gravity feed tanks have what gallon capacity?
• What is the purpose of an oil cooler bypass valve?
• Outline a generic start-to-idle sequence and key parameters to monitor during the test.
• What is the primary outcome of a fuel manifold design in a multi-burner combustor?
• How are the fire pumps operated?
• The seawater cooling system backup provides emergency backup cooling water for which component?
• What is the function of the accessory gearbox (AGB) on a gas turbine engine?
• Which statement describes the function of the foreman system?
• LPAC is powered by which motor horsepower?
• The LO strainer basket has which micron rating?
• What is the purpose of active clearance control mechanisms in some engines?
• Why is oil sampling after operation important for engine health monitoring?
• In a two-spool gas turbine, what do N1 and N2 refer to?
• List essential personal protective equipment and safety practices when performing maintenance on gas turbines.
• A wrecking bar is used for which tasks?
• What is overspeed protection and how does it operate?
• Which practice is commonly used to prevent FOD in air intakes?
• Which statement best describes surge margin?
• When performing a hot section borescope inspection, what is primarily being looked for?
• When both LO sumo tanks are at normal operating capacity, what is the total volume?
• What is the purpose of a hot section inspection and which areas are inspected?
• What is a typical consequence of oil-system contamination?
• Why are turbine blades cooled and what is the primary cooling method?
• What is the purpose of a fire extinguisher bottle in an engine bay?
• In addition to accelerometers, what practice is used to assess rotational vibration over time?
• What is EGT and why is it monitored during operation?
• What is the function of inlet anti-ice and how is it typically implemented?
• List three common indicators of fuel system trouble.
• Which fluid does the fuel oil ballasting/compensation system use to replace used fuel?
• How is rotational vibration typically monitored in a gas turbine engine?
• What is the role of the ignition exciter in the ignition system?
• Pumps 1, 3, and 5 supply which area?
• SIBS provides system level information for which groups?
• What is an overspeed trip and where is it implemented?
• During start-to-idle progression, what indicates readiness to transition to idle?
• Which temperature parameter is commonly used to set start/run limits in gas turbine operation?
• What is included in a Revision record?
• If the fuel-air ratio is too low during operation, what is typically observed?
• The LO cooler is constructed as which type of heat exchanger?
• What is the basic sequence of events in a Brayton cycle for a gas turbine engine?
• FM services include which combination?
• Blue prints are copies of mechanical drawings and include which elements?
• Which combination of factors generally increases Brayton cycle efficiency?
• What is the purpose of temperature sensors (thermocouples) in turbine instrumentation?
• Which symptom would indicate the presence of ferrous particles as flagged by a chip detector?
• In a two-spool gas turbine engine, which statement correctly describes the LP and HP compressors?
• Blue prints include which elements?
• How many propulsion GTEs and GTGs are there?
• Which type of tank has a capacity of 600 gallons?
• Why is verifying spray pattern and atomization important during fuel nozzle maintenance?
• How is the gas path through a gas turbine described?
• Which item would you expect to find in a revision record?
• Why are turbine blade clearances important and how are they managed?
• Which are the major sections of a typical gas turbine engine?
• What is the discharge pressure rating of the fire pumps?
• During borescope inspections, which internal components are evaluated?
• What are the two LPAC 2 operating modes?
• What types of bearings are commonly used in gas turbine assemblies?
• Why is air filtration important for gas turbine intake air?
• In a wet-sump lubrication system, where is the oil stored?
• What is the main purpose of a turbine blade inspection program?
• What safety precautions should be observed when working near operating gas turbines?
• Describe the procedure for performing a manual rotation of the engine for inspection.
• Which LO component is hydraulically operated?
• Which of the following is a common reason for a turbine to fail to relight after a flameout?
• Where is ITT (intermediate turbine temperature) typically measured?
• LPAC furnishes compressed air through which categories?
• What is a chip detector and what does it indicate?
• The LO unloader actuation medium is which?
• Which sequence correctly describes the Brayton cycle as applied in a gas turbine engine?
• What is the function of an oil cooler in the lubrication system?
• What navy fuels are used as primary and backup?
• The LP air system provides LP air at 125 psig throughout the ship for which purposes?
• Which statement about LPAC's compressor type is true?
• Which of the following is a typical sign of bearing or shaft wear in a turbine?
• What occurs when surge happens in a compressor?
• What is the micron rating of the LO strainer basket?
• In the Brayton cycle, what is net work?
• What is the normal operating capacity of the LO sumo on the starboard side?
• Which of the following is NOT a common non-destructive testing method used for turbine blades and disks?
• Which space is explicitly noted in the fire pump location list?
• Which stability control devices are commonly used to increase surge margin in high-pressure ratio operation?
• Which of the following is NOT a category of air supplied by the LPAC?
• What is non-destructive testing (NDT) and give two common methods used on turbine components?
• What is the role of an engine fire detection and suppression system?
• Describe the role of the fuel control unit in meeting engine speed commands.
• What are the rated flow and pressure for the fuel service pump at low and high speeds?
• The LO strainer basket rating in microns is which option?
• Which statement best describes engine health monitoring in field trend analysis?
• What is the role of an engine starting motor or generator in the GSM starting system?
• What does a variable bleed valve (VBV) do in compressor stability control?
• What is the role of the ignition system in a gas turbine?
• Technical work documents include which items?
• What maintenance actions are typical for ensuring fuel system integrity during PM?
• What checks are performed on fuel nozzles during maintenance?
• What is the function of the combustion chamber liner?
• What color are the fire main valve hand wheels?
• Which TM section contains deficiency and evaluation reports?
• The flat bar described is used to pull nails in enclosed areas. Which dimension best matches its description?
• Which statement correctly describes a dry-sump lubrication system?
• What is bleed air and where is it used in gas turbine systems?
• Why is correct torque critical when tightening engine fasteners?
• Distinguish between ITT and EGT in terms of measurement location and use.
• What types of oil are typically used in turbine lubrication and why is oil cleanliness critical?
• LPAC intake air passes through how many filters?
• How does vibration analysis contribute to predictive maintenance of GSM engines?
• What is an air start system and how does it operate?
• What is the purpose of seals in a gas turbine and name a common seal type?
• What is the primary reason for ensuring oil viscosity is within specification?
• What is the function of the combustor in a gas turbine engine?
• Why is fuel filter replacement important, and what monitoring is used?
• Which action best supports preventing surge during start?
• How does increasing compressor pressure ratio affect engine performance and stability?
• What is blade root dovetail retention and why is it critical?
• Why is spray pattern check important during PM?
• What is the starboard fuel capacity in engine room #2?
• What is the purpose of the fuel control unit in a gas turbine?
• Which component is not typically inspected during a borescope inspection?
• What is the function of the fuel manifold in a multi-burner combustor arrangement?
• What units are commonly used to express fuel flow in gas turbines?
• Fuel head tanks have what gallon capacity?
• Define compressor surge and describe a common cause.
• What is borescope inspection and what is it used for in GSM maintenance?
• How is the LO unloader operated?
• Which statement about the exhaust in a gas turbine is true?
• Define surge margin in the context of compressor stability.
• Which description best classifies the attached LO pump?
• What is the total fuel capacity in engine room #2?
• What are the normal operating capacities for the LO sumo on the starboard and port sides?
• Which statement best describes how efficiency relates to pressure and temperature ratios in the Brayton cycle?
• Maintaining oil viscosity in the lubrication system is achieved primarily by the oil cooler in what way?
• What is the activation pressure of the built-in relief valve for the fuel service pumps?
• Which is the typical sequence when starting a gas turbine with an air-start system?
• What is the fire pump location designation?
• Which component filters debris before entering the LO system?
• Tank level indicator alarms are set at which high and low levels?
• Engine Pressure Ratio (EPR) is commonly used to estimate which parameter on some engines?
• Which set of non-destructive testing methods is commonly used for turbine blades and disks?
• What are common causes of abnormal vibration in a running turbine?
• What is the impact of fuel quality and cleanliness on gas turbine operation?
• A sudden drop in oil pressure in a turbine lubrication system most likely indicates?
• What is the purpose of lockout/tagout in turbine maintenance?
• Which space is included in the fire pump location list?
• What is the purpose of performing a hot section inspection with a borescope?
• How do ambient temperature and altitude affect fuel metering and engine performance?
• What are the main functions of the lubrication system in a gas turbine?
• What is the port fuel capacity in engine room #2?
• What is the total fuel capacity in engine room #1?
• How do mineral oil and synthetic oil differ in performance in turbine lubrication?
• How is engine health monitoring performed in the field?
• How many volumes does PPM have?
• Describe the function of the accessory gearbox (AGB) in a gas turbine engine.
• Which space is explicitly noted in the fire pump location list?
• What is the function of the compressor in a gas turbine?
• Which maintenance practices support gas turbine reliability?
• Which item is used for demolition tasks?
• In a hydromechanical/engine control system, what is the function of the fuel control servo?
• What is the primary purpose of the ignition system in starting and relighting the combustor?
• Which statements best describe how turbine blade clearance is managed in engines that require tight tolerances?
• A flat bar is best described as which tool?
• How can fuel nozzle leaks be detected and what precautions should be taken?
• LPAC draws in air through which filters?
• LPAC is powered by which horsepower electric motor?
• Schematic drawings show which of the following?
• How is oil pressure monitored and controlled in a turbine lubrication system?
• What is the purpose of bleed air in gas turbine systems and where is it typically taken from?
• What are typical causes and consequences of oil-system contamination?
• LPAC is classified as which type of compressor?
• What is the general purpose of Tech Manuals?
• The LO unloader senses and maintains pressure at the most remote bearing at what setpoint?
• What is the purpose of an oil cooler in the engine lubrication system?
• How do carbonizing or soot deposits form on fuel nozzles, and what is the impact?
• Why are turbine blade inspections critical and what methods are used?
• The vital air service maintains what pressure?
• If a variable bleed valve fails to operate properly, what is a likely consequence?
• How many fuel tanks are in each engine room?
• The flat bar described is used to pull nails in enclosed areas. Which dimension best matches its description?
• Which component is NOT typically driven by the accessory gearbox (AGB)?
• Which locations contain the tank level indicators?
• Which method is used to detect fuel/oil contamination in the lubrication system?
• The LO basket used for filtration has what micron rating?
• Which component contains a 40-micron basket?
• Pumps 2, 4, and 6 supply which area?
• If a fuel leak is suspected during operation, what steps should be taken?
• What is the purpose of the lubrication system in a gas turbine engine?
• The LO unloader maintains a setpoint pressure of which value at the farthest bearing?
• Which component is used to scavenge oil in a dry-sump system?
• Which subsystem is included as an accessory system in a gas turbine?
• Tech Manuals are used to contain information for which of the following?
• What is cross-bleed starting and when is it used?
• Fire pumps are which type of pump?
• The LO sump pump relief system uses how many relief valves and what is the lift setting?
• What type are fuel oil (FO) systems?
• What is the port fuel capacity in engine room #1?
• Which engine room has the larger total fuel capacity?
• Which statement best explains why ITT is used for start/run limits and EGT for exhaust health?
• How is fuel/oil contamination detected in the lubrication system?
• How does foreign object damage (FOD) occur and how is it typically mitigated?
• In an ignition system, what action is taken if flameout occurs and ignition is lost?
• What are common indicators of compressor stall or surge during operation?
• What happens during the combustion section of a gas turbine cycle?
• Which LO device is described as a filtration device using a micron-rated basket?