15 Questions
What is the purpose of the auxiliary lubrication oil supply?
To cool the gas turbine bearings
What is the purpose of the anti-icing system in gas turbines operating in cold climates?
To reintroduce hot air into the compressor inlet section
What type of pumps are generally employed for liquid fuel utilized for a gas turbine?
Volumetric pumps
What happens during a major overhaul of a gas turbine?
The gas turbine undergoes total strip down for inspection, cleaning, and repair
What is observed or checked for aging or maintenance in gas turbines?
Increased roughness on turbine blades caused by impurities in the fuel
How does an increase in air temperature affect air density?
It decreases air density
What effect does high barometric pressure have on air density?
It increases air density
Why do changes in atmospheric pressure and temperature dramatically affect the output of a gas turbine?
Because they affect the mass of air flow and therefore the density
What are the factors considered when programming fuel admission and ignition sequences during startup?
Compressor inlet temperature, compressor discharge pressure, and engine speed
Which type of fuel systems are mentioned in the text?
Natural gas, liquid, or gas-liquid dual fuels
What is the purpose of the fuel shutoff valve in a gas turbine system?
To control the flow of fuel to the combustor
In a fully automatic gas turbine startup, at what point does the ignition turn off and the starter motor disengage?
At 50% of the maximum RPM
Which device is used to bring the gas turbine to rest if the turbine speed exceeds a pre-determined RPM?
Overspeed trip device
What does a high stator temperature in a gas turbine generator indicate?
An impending cooling system problem
Which system is used to start gas turbines and requires periods of cranking, purging, firing, acceleration, and load acceptance?
Gas Turbine Starting System
Test your knowledge of how ambient temperatures and atmospheric pressure affect the operation and performance of gas turbines. Learn about the inverse relationship between air temperature and density, as well as the direct effect of barometric pressure on air density.
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