15 Questions
How does an increase in air temperature affect air density?
Decreases air density
What effect does high barometric pressure have on air density?
Increases air density
How do changes in atmospheric pressure and temperature affect gas turbine performance?
They decrease power output
What parameters are considered during the startup of gas turbines?
Compressor inlet temperature, compressor discharge pressure, and engine speed
What type of fuels are preferred for gas turbine fuel systems?
Clean gaseous fuels
What is activated by temperature-sensitive relays in the event of a fire?
Pressurized halon or carbon dioxide nozzles
What may be washed during a short shutdown maintenance procedure?
Inlet air filters
What experiences a loss of 0.5% in power and efficiency for every 1000 hours of service?
Gas turbines
What is involved in a major overhaul maintenance procedure for gas turbines?
Total strip down of the gas turbine
What may cause increased roughness on the turbine blades according to the text?
Corrosion due to impurities present in the fuel
What is the purpose of the fuel shutoff valve in a gas turbine system?
To control the fuel flow to the combustor
In a typical automatic gas turbine startup, what happens at approximately 20% of the maximum engine RPM?
The fuel shutoff valve opens and ignition starts
What is the function of the overspeed trip devices in gas turbines?
To cut off fuel if the turbine speed exceeds a pre-determined RPM
What indicates an impending cooling system problem in a gas turbine?
A high stator temperature
Why is an anti-icing system required in gas turbines operating in cold climates?
To introduce hot air into the compressor inlet section
Test your knowledge about how ambient temperatures and atmospheric pressure affect the operation and performance of gas turbines. Learn about the inverse effect of air temperature changes on air density and the direct effect of barometric pressure on air density.
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