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Examoogle • User • info@examoogle.com • EE-2024-8821
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Which of the following is a type of Gas Turbine Plant?
Single Acting
Double Acting
Open
None of the mentioned
Open
Quick Summary: Gas turbine plants are classified based on the flow cycle into open-cycle and closed-cycle systems. An open-cycle gas turbine plant takes in atmospheric air, compresses it, combusts fuel within the air stream, expands the resulting hot gases through a turbine, and exhausts them directly to the atmosphere.
Gas turbine plants are classified based on the flow cycle into open-cycle and closed-cycle systems. An open-cycle gas turbine plant takes in atmospheric air, compresses it, combusts fuel within the air stream, expands the resulting hot gases through a turbine, and exhausts them directly to the atmosphere.
Wnet=Wt−Wc — Total net work output of the cycle
ηthermal=QinWnet — Thermal efficiency of the gas turbine plant
In an open-cycle gas turbine plant, air is drawn from the atmosphere by a compressor. This compressed air enters the combustion chamber where fuel is injected and ignited at constant pressure. The resulting high-temperature, high-pressure gas expands through the turbine to generate work, after which it is exhausted into the environment, making it a non-recirculating process.
Open cycle plants are simpler and cheaper compared to closed cycle plants.
The Brayton cycle is the theoretical thermodynamic cycle for gas turbine plants.
Air is taken as the working fluid in open cycles, while specific gases like Helium or Argon are used in closed cycles.
Low capital cost compared to steam power plants.
Quick starting time from cold condition.
Requires less floor space.
Lower overall thermal efficiency.
High exhaust gas temperatures lead to significant energy loss.
Sensitive to changes in ambient air temperature and pressure.
Peaking power plants in electrical grids.
Aircraft propulsion (Jet engines).
Combined Cycle Power Plants (CCPP).
Single Acting and Double Acting are terms primarily used for reciprocating engines or pumps, not gas turbines.
Closed-cycle systems recirculate the working fluid, allowing for the use of external combustion or nuclear heat sources.
C is correct — An Open-cycle gas turbine plant is a standard configuration where atmospheric air is continuously taken in, heated, and exhausted.
Always distinguish between thermodynamic cycles (Brayton for gas, Rankine for steam) as this is a frequently tested concept in thermal engineering.