100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
EOOW study UPDATED Exam Questions and CORRECT Answers $8.99   Add to cart

Exam (elaborations)

EOOW study UPDATED Exam Questions and CORRECT Answers

 2 views  0 purchase
  • Course
  • EOOW
  • Institution
  • EOOW

EOOW study UPDATED Exam Questions and CORRECT Answers What are the 5 events that take place in the Brayton cycle? - CORRECT ANSWER- Intake, compression, combustion, expansion(power), exhaust What does an increase in ambient air temp result in? - CORRECT ANSWER- A decrease in fuel economy and...

[Show more]

Preview 3 out of 16  pages

  • September 11, 2024
  • 16
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • EOOW
  • EOOW
avatar-seller
MGRADES
EOOW study UPDATED Exam Questions
and CORRECT Answers
What are the 5 events that take place in the Brayton cycle? - CORRECT ANSWER-✔✔
Intake, compression, combustion, expansion(power), exhaust


What does an increase in ambient air temp result in? - CORRECT ANSWER-✔✔ A decrease
in fuel economy and power output


What are the metering point? - CORRECT ANSWER-✔✔ Positions 2,3 & 5.4



What is position 2 in the GTM? - CORRECT ANSWER-✔✔ The compressor inlet which
measured values include T2- temperature at position 2 and Pt2 pressure total at position 2


What is position 3 in the GTM? - CORRECT ANSWER-✔✔ The compressor discharge
which measures the static pressure (ps3) expressed in psi (commonly referred to as CDP,
compressor discharge pressure)


What is position 5.4 in the GTM? - CORRECT ANSWER-✔✔ The inlet to the power turbine
which measured values are T5.4, power turbine inlet temp and Pt5.4, power turbine inlet
pressure expressed in psi


What is the LM 2500 GTM rated at? - CORRECT ANSWER-✔✔ Ambient temp: 100
degrees
Barometric pressure: 29.92 inches Hg
Relative humidity: 0%
Brake horsepower: 26,250
Fuel consumption: 0.42 LB/Hr/Hp


What 2 major assemblies does the LM 2500 consist of ? - CORRECT ANSWER-✔✔ The gas
generator and the power turbine


How many stages is the GTM compressor? - CORRECT ANSWER-✔✔ 16 stages

,What does the compressor stator assembly consist of? - CORRECT ANSWER-✔✔ One set
of inlet guide vanes (IGV) and 16 sets of stationary blades


What are the first six stages stator blading that can be moved called? - CORRECT
ANSWER-✔✔ Variable stator vanes (VsVs)



The VsVs adjusts as a function of what? - CORRECT ANSWER-✔✔ The compressor inlet
temp (CIT), Ngg, and compressor discharge pressure (CDP)


The VsVs minimize the chances of what? - CORRECT ANSWER-✔✔ A stall



The compressor rear frame houses what? - CORRECT ANSWER-✔✔ The combustor, HP
turbine, fuel manifold, 30 fuel nozzles, two spark ignitors, and costumer service bleed air
manifold


What type of combustor is in the GTM? - CORRECT ANSWER-✔✔ An annular type
combustor located inside the compressor rear frame


What percentage of air mixes with the fuel to burn in the combustor? - CORRECT
ANSWER-✔✔ 30%


What percentage of air is used for cooling, flame centering, and bleed air? - CORRECT
ANSWER-✔✔ 70%



Describe the HP Turbine - CORRECT ANSWER-✔✔ A high pressure, two stage, axial flow
turbine


What cools the HP turbine rotary assembly? - CORRECT ANSWER-✔✔ CDP air (16th stage
bleed air)


How are the gas generator and power turbine rotar shaft connected? - CORRECT ANSWER-
✔✔ Aerodynamically coupled

, What does the accessory gear box provide? - CORRECT ANSWER-✔✔ Mounting for and
drives the components needed to start and sustain engine operations


What are the mounted accessories included in the gear box? - CORRECT ANSWER-✔✔
FLAP, (fuel pump, lubo supply, air/oil separator, pneumatic starter)


Describe the power turbine - CORRECT ANSWER-✔✔ A six stage axial flow turbine
aerodynamically coupled to the gas generator, used to drive the main reduction gear via a
high speed flexible coupling shaft (HSFCS)


At what stages is bleed air extracted from the GTM? - CORRECT ANSWER-✔✔ 8th stage-
provides air for the bearing sump pressurization and cooling
9th stage- provides air to the power turbine balance chamber
13th stage- provides air to cool the 2nd stage HP turbine nozzles
16th stage- provides air to the gas generator balance chamber, HP turbine 1st and 2nd rotor
blade cooling, 1st stage HP turbine nozzle and costumer service bleed air system


What are symptoms of a stall in the GTM? - CORRECT ANSWER-✔✔ Higher than normal
or rapid rise in T5.4, decreasing or fail to increase Ngg, low frequency rumble or roar,
sluggish throttle response, higher than normal vibration, and lower than normal Pt5.4


What does the starting and motoring consist of? - CORRECT ANSWER-✔✔ A pneumatic
turbine starter and a start air valve


What does the starter air valve regulates start air to? - CORRECT ANSWER-✔✔ 35-41 psi


Prior to initiating the start command what checks to see if the start permissive are met ? -
CORRECT ANSWER-✔✔ The AN/UYK-44 computer in the SCU



What are the permissive that must be met prior to engine start? - CORRECT ANSWER-✔✔
1.MRG lube oil pressure greater than 13 psig
2.LM 2500 gas generator speed (Ngg) less than 3500 RPM

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller MGRADES. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $8.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

80364 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$8.99
  • (0)
  Add to cart