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77 Cards in this Set
- Front
- Back
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What is the greatest gas turbine engine asset? |
Power to weight ratio |
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Within how many days can a GTE be changed out on a frigate or cruiser? |
4 |
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How many hours would it take for a GTE on a hovercraft to be changed out? |
8 |
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Which type of cycle does combustion occur at constant pressure? |
Brayton |
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The type of shaft used on GTE may be what? |
Single, split, or twin spool |
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What are the two types of compressors? |
Centrifugal flow and axial flow |
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What are the three types of combustion chambers? |
Can, annular, and can-annular |
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What are the two types of air seals used in GTEs? |
Labyrinth and honeycomb |
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What are the three types of oil seals used in GTEs? |
Lip-type, labyrinth/windback, and carbon ring |
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What are the three types of starters used in GTEs? |
Electric, hydraulic, and pneumatic |
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How long can the inner wall of the LM2500 withstand a temperature of 2000 degrees? |
15 mins |
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What is the starter operating air pressure for starting the LM2500? |
35-41 psig |
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The LM2500 has how many fuel nozzles? |
30 |
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About what percent of the compressor discharge air entering the combustion section passes to the burner can in the Allison 501k? |
25% |
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GTG engine speed is measured by what? |
Magnetic pickup |
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How many and what type of thermocouples are used in the GTG? |
18, chromel-alumel |
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What type of friction exists between a body at rest and the surface upon which it rests? |
Static |
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What type of friction exists between moving bodies? |
Kinetic |
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What is the minimum flash point for lube oil? |
300 degrees |
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How many hours at a minimum must fuel oil be circulated before a service tank is placed in operation? |
3 hours |
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Main drainage system has eductors of how many GPM? |
1250 |
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How many rpm can hovercrafts accelerate to? |
100 |
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What are the two elements required for proper operation of a GTE? |
Newton's third law and Bernoulli's principle |
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The two main elements of an axial flow compressor are what? |
A rotor and stator |
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What are the two main types of axial compressor rotors? |
Disc and drum |
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The pressure rise of about how many times the preceding stage is about as much as a single stage can handle in a compressor? |
1.2 |
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What are used to straighten airflow and directed to the first stage rotor? |
Inlet guide vanes |
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What have the critical function of supporting the main engine rotor? |
Main bearings |
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What are the high voltage electrical spark producers power from the ignition exciter circuits? |
Spark igniters |
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The heater in the LM 2500 enclosure maintains air temperature above how many degrees it is not operating to ensure suitable fuel viscosity is maintained for engine starting? |
60 degrees Fahrenheit |
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Navy GTEs are not rated for operation in ambient temperatures above how many degrees? |
130 degrees Fahrenheit |
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FOD screen prevents foreign objects larger than how many inches from entering the engine? |
0.25" |
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Which components direct air from the inlet plenum to the compressor? |
bellmouth and bulletnose |
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Which type of combustor is the LM2500 combustor? |
Annular |
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How many disks does the power turbine rotor have with integral disk spacers bolted together to form the rotor spool? |
6 |
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Air from the ship's start air system is supplied through an inlet fitting on the enclosure base to the starter valve at 0 to what psig? |
75 |
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What are the two pumping elements of fuel pumps? |
centrifugal boost element and HP gear |
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Which sensor controls or meters fuel across an orifice? |
compressor inlet temperature (CIT) |
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Which type of rotary actuator moves the internal components of the main fuel control to control the fuel flow to the engine? |
power level angle (PLA) |
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Which type of DC generator is directly coupled to the motor shaft and outputs a DC voltage proportional to the motor speed? |
tachometer |
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Engine vibration is measured by a displacement type of what? |
vibration transducer |
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Which governor system provides constant speed regardless of load? |
isochronous |
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Which governor mode regulates speed but will decrease slightly with an increase in load? |
droop |
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What supplies field excitation to its associated GTE? |
governor control unit (GCU) |
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Where are the resistance temperature detectors embedded in the generator stator winding slots? |
Babbitt |
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What are the three types of kinetic friction? |
sliding, rolling, fluid |
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What is the molecular attraction between particles called that holds a substance or body together? |
cohesion |
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What is the molecular attraction between particles called that causes unlike surfaces to stick together? |
adhesion |
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Which oil property is its tendency to resist flow or change of shape? |
viscosity |
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What are the two types of bowls that centrifugal purifiers used on ships? |
tubular and disc |
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Which program provides spectrometric analysis of ship's L/O at a designated laboratory? |
navy oil analysis program (NOAP) |
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What is the last conditioning station before F/O is used in the GTE? |
coalescer |
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What psi is bleed air regulated at? |
75 |
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An icing condition exists when the inlet air temperature to a GTE is what? |
41 degrees Fahrenheit or less and 70% humidity or greater |
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Which type of air system modifies the thrashing noise produced by the ship's propellers to disguise the sonar signature of the propellers? |
prairie |
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Halon 1301 decomposes on hot surfaces above how many degrees? |
900 degrees Fahrenheit |
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What will battle override not override? |
PT overspeed trip and flameout |
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Which system provides centralized and remote monitoring and control of the propulsion, electrical, auxiliary, and damage controls on the arleigh-burke class ship? |
machinery control system (MCS) |
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Which oil property is its ability to separate cleanly from any water present? |
demulsibility |
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What is a bowl or hollow cylindrical vessel called that rotates at high speed while liquid passes through it? |
centrifuge |
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Bleed air is cooled to what temperature and distributed to the masker emitter rings outside the ship's hull on the CG and DD? |
190 degrees Fahrenheit |
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What are the three systems that make up a ship's drainage system? |
main drainage, secondary drainage, and ballast system |
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How many manual/hydraulic operated butterfly valves are associated with the SWS? |
9 |
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Which panel is at the bottom panel of the propulsion control console? |
propulsion control |
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What is the engine room console on the FFG class ship? |
local operating panel (LOP) |
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Which high speed printer can print bell commands as well as changes in propulsion system status? |
bell logger |
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What computer performs centralized monitoring and controlling functions for the console which is embedded in each MCS console? And how many consoles in the MCS have these computers? |
AN/UYK-44/6 |
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Which tape unit is used as a data logger to record MCS machinery status changes and alarms? |
AN/USH-26(V) |
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Which panel is used by the EOOW to monitor selected parameters of the engineering plant? |
A2 |
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Which units provide the local control for LM2500 that drive the shafts and they provide the interfaces with the auxiliary machinery plant? |
SCU |
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The PACC communicates with the SCU and with other consoles in the MCS over ship's what? |
data multiplexing system (DMS) |
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Which control system is used on DD class ships? |
electric plant console equipment (EPCE) |
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How many 60/400hz converters does the DD class ship have? |
3 |
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How many panels is the EPCC on the FFG divided into? |
9 |
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How many sections does the rear of the DCC consist of? |
5 |
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Which system is a general purpose user oriented electronic information transfer system that provides data transfer for the major systems aboard the DDG-51 class ships? |
data multiplex system (DMS) |
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The bell logger provides an automatic printout each hour or when the propeller RPM or pitch is changes by more that what percent in addition to other events? |
5% |
