Gas Turbine Operation and Performance

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How does an increase in air temperature affect air density?

Increases air density

Has no effect on air density

Decreases air density (correct)

Increases atmospheric pressure

What effect does high barometric pressure have on air density?

Has no effect on air density

Increases air density (correct)

Decreases air density

Decreases atmospheric pressure

How do changes in atmospheric pressure and temperature affect gas turbine performance?

They vary the type of fuel used

They increase power output

They have no effect on gas turbine performance

They decrease power output (correct)

What parameters are considered during the startup of gas turbines?

Compressor inlet temperature, compressor discharge pressure, and engine speed Signup and view all the answers

What type of fuels are preferred for gas turbine fuel systems?

Clean gaseous fuels Signup and view all the answers

What is activated by temperature-sensitive relays in the event of a fire?

Pressurized halon or carbon dioxide nozzles Signup and view all the answers

What may be washed during a short shutdown maintenance procedure?

Inlet air filters Signup and view all the answers

What experiences a loss of 0.5% in power and efficiency for every 1000 hours of service?

Gas turbines Signup and view all the answers

What is involved in a major overhaul maintenance procedure for gas turbines?

Total strip down of the gas turbine Signup and view all the answers

What may cause increased roughness on the turbine blades according to the text?

Corrosion due to impurities present in the fuel Signup and view all the answers

What is the purpose of the fuel shutoff valve in a gas turbine system?

To control the fuel flow to the combustor Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

What indicates an impending cooling system problem in a gas turbine?

A high stator temperature Signup and view all the answers

Why is an anti-icing system required in gas turbines operating in cold climates?

To introduce hot air into the compressor inlet section Signup and view all the answers

Gas Turbine Operation and Performance

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