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Gas Turbine Operation and Performance Quiz

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Gas Turbine Operation and Performance Quiz

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Questions and Answers

What is the purpose of the auxiliary lubrication oil supply?

To cool the gas turbine bearings (correct)

To clean the compressor blading

To control the temperature of the gas turbine

To adjust the fuel flow to the combustor

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 (correct)

To clean the compressor blading

To protect against fire hazards

To increase the power output and efficiency

What type of pumps are generally employed for liquid fuel utilized for a gas turbine?

Reciprocating pumps

Diaphragm pumps

Volumetric pumps (correct)

Centrifugal pumps

What happens during a major overhaul of a gas turbine?

The gas turbine undergoes total strip down for inspection, cleaning, and repair Signup and view all the answers

What is observed or checked for aging or maintenance in gas turbines?

Increased roughness on turbine blades caused by impurities in the fuel Signup and view all the answers

How does an increase in air temperature affect air density?

It decreases air density Signup and view all the answers

What effect does high barometric pressure have on air density?

It increases air density Signup and view all the answers

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 Signup and view all the answers

What are the factors considered when programming fuel admission and ignition sequences during startup?

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

Which type of fuel systems are mentioned in the text?

Natural gas, liquid, or gas-liquid dual fuels Signup and view all the answers

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

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

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 Signup and view all the answers

Which device is used to bring the gas turbine to rest if the turbine speed exceeds a pre-determined RPM?

Overspeed trip device Signup and view all the answers

What does a high stator temperature in a gas turbine generator indicate?

An impending cooling system problem Signup and view all the answers

Which system is used to start gas turbines and requires periods of cranking, purging, firing, acceleration, and load acceptance?

Gas Turbine Starting System Signup and view all the answers