Gas Turbine Maintenance and Overhaul
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Questions and Answers

Where is the regenerator located in a gas turbine cycle?

  • Between the load turbine and generator
  • Between the turbine outlet and compressor inlet (correct)
  • Between the power and load turbine
  • Between the compressor and combustor

    • What is the purpose of a regenerator in a gas turbine?

  • To raise the air temperature before compression
  • To clean the exhaust gases
  • To improve the efficiency of the turbine (correct)
  • To decrease the air temperature after compression

    • What is the effect of an intercooler on a gas turbine air compressor?

  • It is only used with axial type compressors
  • It increases the output at the turbine
  • It increases the volume of air being supplied
  • It decreases the temperature of the air after compression (correct)

    • What is the function of the combustion chamber in a gas turbine?

    <p>To burn fuel with excess air</p> Signup and view all the answers

    What is a requirement for a gas turbine combustion chamber?

    <p>A safety pressure relief device</p> Signup and view all the answers

    Why does the capacity of a gas turbine increase in cold weather?

    <p>The density of the air is increased</p> Signup and view all the answers

    What is a characteristic of a dual shaft gas turbine arrangement?

    <p>The load turbine drives the prop on a turbo prop engine</p> Signup and view all the answers

    What is another name for the gas turbine cycle?

    <p>The Joule cycle</p> Signup and view all the answers

    Which of the following is NOT a characteristic of industrial gas turbines compared to aero-derivative turbines?

    <p>Light weight</p> Signup and view all the answers

    What is the primary function of vibration accelerometers in large industrial gas turbines?

    <p>To monitor bearing condition</p> Signup and view all the answers

    What is the approximate percentage of exhaust heat recovered by a regenerator in a gas turbine cycle?

    <p>70%</p> Signup and view all the answers

    What would cause a protective device to shutdown the turbine?

    <p>Governor oil pressure is too low</p> Signup and view all the answers

    What is the primary function of turbine nozzles?

    <p>To convert heat energy into kinetic energy</p> Signup and view all the answers

    What is the purpose of labyrinth seals in a steam turbine?

    <p>To provide a positive leak-proof seal arrangement</p> Signup and view all the answers

    What is the ideal application for gas turbine systems?

    <p>Unmanned and remote locations</p> Signup and view all the answers

    Where is the regenerator located in a gas turbine cycle?

    <p>Between the turbine outlet and compressor inlet</p> Signup and view all the answers

    What is the effect of flange warming on a steam turbine?

    <p>It decreases start-up time</p> Signup and view all the answers

    How does the expansion of steam occur in a pressure compound steam turbine?

    <p>In multiple stages with separate nozzles and blades for each stage</p> Signup and view all the answers

    What is the greatest limitation on increased turbine output?

    <p>Heat resisting steels</p> Signup and view all the answers

    What does the maximum power achieved by a gas turbine depend on?

    <p>Life expectancy of hot gas components</p> Signup and view all the answers

    In which type of turbine does the pressure across the moving blades remain constant?

    <p>Reaction turbine</p> Signup and view all the answers

    Why are discs heated during the assembly of disc rotors?

    <p>To make them easier to slide onto the shaft</p> Signup and view all the answers

    What is the purpose of the small clearance between the discs in a disc rotor?

    <p>To allow for thermal expansion</p> Signup and view all the answers

    What type of turbine is characterized by a difference in pressure across the blades?

    <p>Impulse turbine</p> Signup and view all the answers

    What is an essential auxiliary in a gas turbine installation?

    <p>A starting motor</p> Signup and view all the answers

    Why is good quality fuel important in a gas turbine?

    <p>To keep the gas pass clean</p> Signup and view all the answers

    What is the primary function of the lubricating oil system in a gas turbine?

    <p>Lubricating sliding surfaces in the bearings</p> Signup and view all the answers

    What is the purpose of inspecting and cleaning air intake filters in a gas turbine?

    <p>To keep the gas pass clean</p> Signup and view all the answers

    What is the result of water washing of compressor blades in a gas turbine?

    <p>Cleaner gas pass</p> Signup and view all the answers

    What is the purpose of the total energy arrangement in a gas turbine cycle?

    <p>To provide all necessary forms of energy</p> Signup and view all the answers

    Why is it important to inspect and clean air intake ducts in a gas turbine?

    <p>To keep the gas pass clean</p> Signup and view all the answers

    What is the function of the lubricating oil system in relation to the bearings in a gas turbine?

    <p>Lubricating sliding surfaces in the bearings</p> Signup and view all the answers

    What maintenance tasks are required for a combustion unit of a gas turbine?

    <p>Re-adjusting fuel flows, cleaning of fuel burners, and testing igniters and retraction gears</p> Signup and view all the answers

    When is a major overhaul performed on a gas turbine?

    <p>According to manufacturers specifications</p> Signup and view all the answers

    What are the basic components of a gas turbine oil system?

    <p>Oil reservoir, filters, pumps, and coolers</p> Signup and view all the answers

    What must be done to keep the gas passages of a gas turbine clean?

    <p>Inspect and clean air intake filters, inspect air intake ducts, and use good quality fuel</p> Signup and view all the answers

    What interlocks must be in the start position to start a gas turbine?

    <p>Dampers and ducting open, and control circuits energized</p> Signup and view all the answers

    What is the purpose of filters in a gas turbine oil system?

    <p>To ensure the oil is clean</p> Signup and view all the answers

    Study Notes

    Steam Turbine Principles and Design

    • Turbine nozzles convert heat energy into kinetic energy.
    • Labyrinth seals are made of brass or stainless steel and are designed to have small clearances between the shaft and casing.
    • Flange warming on a steam turbine decreases creep.
    • In pressure compound steam turbines, the expansion of steam from boiler pressure to exhaust pressure is carried out in a number of steps or stages, with each stage having a set of nozzles and a row of blades.
    • In an impulse turbine, there is a difference in pressure across the stationary blades, causing steam to tend to leak around the periphery of the blades instead of passing through them.
    • The pressure at the outlet from the moving blades is the same as the pressure at the inlet to the moving blades in a reaction turbine.

    Gas Turbine Principles and Design

    • The purpose of a regenerator in a gas turbine is to raise the air temperature before compression.
    • A gas turbine air compressor with an intercooler increases the volume of air being supplied.
    • The combustion chamber of a gas turbine burns fuel with excess air and utilizes 70% of the air supplied by the compressor for the actual combustion process.
    • A gas turbine combustion chamber requires a safety pressure relief device.
    • The capacity of a gas turbine will increase in cold weather because the density of the air is increased.
    • In a dual shaft gas turbine arrangement, the load turbine is downstream from the compressor turbine.
    • A gas turbine cycle is also known as the Joule cycle.
    • Vibration accelerometers are used to trip the turbine on rapid acceleration.
    • Protective devices will shut down the turbine if the lube oil pressure is too high or the governor oil pressure is too low.

    Gas Turbine Auxiliaries and Operation

    • An essential auxiliary in a gas turbine installation is a starting motor.
    • To keep the gas pass of a gas turbine clean, good quality fuel must be used, and air intake filters and ducts must be inspected and cleaned regularly.
    • Gas turbine lubricating oil systems provide the basic functions of lubricating sliding surfaces in the bearings, sealing out dirt and moisture, and cooling of the bearings.
    • The term "total energy arrangement" in gas turbine cycles refers to the system's ability to provide all necessary forms of energy.
    • When performing maintenance on a combustion unit of a gas turbine, tasks include readjusting fuel flows, cleaning fuel burners, and checking flame tubes for proper ignition.
    • A major overhaul is performed on a gas turbine according to the manufacturer's specifications.
    • Gas turbine oil systems consist of an oil reservoir, filters, pumps, coolers, and protective, monitoring, and control devices.
    • To keep the gas passages of a gas turbine clean, good quality fuel must be used, and air intake filters and ducts must be inspected and cleaned regularly.

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    Related Documents

    Steam Turbine Principles and Design Assignment Module 1 PDF

    Description

    This quiz assesses your knowledge of maintenance procedures and schedules for gas turbines, including combustion unit maintenance and major overhaul timelines.

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