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Questions and Answers
Where is the regenerator located in a gas turbine cycle?
What is the purpose of a regenerator in a gas turbine?
What is the effect of an intercooler on a gas turbine air compressor?
What is the function of the combustion chamber in a gas turbine?
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What is a requirement for a gas turbine combustion chamber?
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Why does the capacity of a gas turbine increase in cold weather?
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What is a characteristic of a dual shaft gas turbine arrangement?
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What is another name for the gas turbine cycle?
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Which of the following is NOT a characteristic of industrial gas turbines compared to aero-derivative turbines?
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What is the primary function of vibration accelerometers in large industrial gas turbines?
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What is the approximate percentage of exhaust heat recovered by a regenerator in a gas turbine cycle?
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What would cause a protective device to shutdown the turbine?
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What is the primary function of turbine nozzles?
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What is the purpose of labyrinth seals in a steam turbine?
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What is the ideal application for gas turbine systems?
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Where is the regenerator located in a gas turbine cycle?
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What is the effect of flange warming on a steam turbine?
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How does the expansion of steam occur in a pressure compound steam turbine?
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What is the greatest limitation on increased turbine output?
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What does the maximum power achieved by a gas turbine depend on?
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In which type of turbine does the pressure across the moving blades remain constant?
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Why are discs heated during the assembly of disc rotors?
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What is the purpose of the small clearance between the discs in a disc rotor?
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What type of turbine is characterized by a difference in pressure across the blades?
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What is an essential auxiliary in a gas turbine installation?
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Why is good quality fuel important in a gas turbine?
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What is the primary function of the lubricating oil system in a gas turbine?
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What is the purpose of inspecting and cleaning air intake filters in a gas turbine?
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What is the result of water washing of compressor blades in a gas turbine?
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What is the purpose of the total energy arrangement in a gas turbine cycle?
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Why is it important to inspect and clean air intake ducts in a gas turbine?
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What is the function of the lubricating oil system in relation to the bearings in a gas turbine?
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What maintenance tasks are required for a combustion unit of a gas turbine?
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When is a major overhaul performed on a gas turbine?
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What are the basic components of a gas turbine oil system?
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What must be done to keep the gas passages of a gas turbine clean?
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What interlocks must be in the start position to start a gas turbine?
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What is the purpose of filters in a gas turbine oil system?
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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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Description
This quiz assesses your knowledge of maintenance procedures and schedules for gas turbines, including combustion unit maintenance and major overhaul timelines.
