4678909
Descripción
Test por TRAVIS CANNING, actualizado hace más de 1 año
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Creado por TRAVIS CANNING
hace casi 9 años
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Pregunta 1
Pregunta
A cogeneration system incorporating a diverter valve uses this to do which of the following?
Respuesta
-
Allow combustion gases to enter the HRSG
-
Allow steam entering into the steam turbine
-
Expel the combustion gases back into the turbine
-
All of the above
-
None of the above
Pregunta 2
Pregunta
Which of the following is the first step in starting up a cogeneration system?
Respuesta
-
The gearbox will engage the starting motor
-
Turbine is rotated to about 55% of rated speed
-
Diverter valve will open to atmosphere
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Operator initiates a turbine start up from the control room
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None of the above
Pregunta 3
Pregunta
Water jackets used in a cogeneration system are used to serve which purpose?
Respuesta
-
Recover the heat produced to cool the engine
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Cool the air surrounding the engine
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Cool the lubricating oil of the engine
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All of the above
-
None of the above
Pregunta 4
Pregunta
Carbon dioxide, one of the most important parts of the combustion process is well known for which of the following?
Respuesta
-
Climatic change
-
Greenhouse effect
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Acid rain
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1 and 2
-
None of the above
Pregunta 5
Pregunta
The level of NOx emissions is dependant on which of the following?
Respuesta
-
Combustion chamber geometry
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Air/fuel mixture
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Pressure
-
Temperature
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All of the above
Pregunta 6
Pregunta
The main application for a HRSG is to do which of the following?
Respuesta
-
Steam generation using gas turbine exhaust
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Steam generation using BFW
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Decrease the load on a single piece of equipment
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All of the above
-
None of the above
Pregunta 7
Pregunta
A HRSG unit may include auxiliary or duct burners that are used to do which of the following?
Respuesta
-
Increase the production of steam
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Control the superheater temperatures
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Meet process steam temperature requirements
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All of the above
-
None of the above
Pregunta 8
Pregunta
Low thermal requirements of a control system may occur during which of the following times?
Respuesta
-
During start-up
-
During times of low production
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During times of low electrical requirements
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All of the above
-
None of the above
Pregunta 9
Pregunta
A cogeneration system that is not connected to the electrical grid will do which of the following?
Respuesta
-
Supply all the electrical requirements at the site
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Supply emergency back up electrical requirements
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Supply back up electrical requirements
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All of the above
-
None of the above
Pregunta 10
Pregunta
The biggest advantages of a combined cycle power plant with a single- shaft gas/steam turbine arrangement are?
Respuesta
-
Highest level of thermal efficiency
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Extremely low capital cost
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Short project and construction times
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Low operation and maintenance costs
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All of the above
Pregunta 11
Pregunta
Multi shaft combined- cycle power plants have high efficiency at base load operation.
Respuesta
- True
- False
Pregunta 12
Pregunta
The extra electricity produced by the combined cycle plant gives it which of the following advantages over the conventional steam generating plant?
Respuesta
-
Significant increase in thermal efficiency
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Emissions to atmosphere are lower
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Less fuel is needed
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All of the above
-
None of the above
Pregunta 13
Pregunta
A fully- fired combined cycle cogeneration system may include which of the following?
Respuesta
-
Fired HRSG
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Gas turbine
-
Steam turbine
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Generators
-
All of the above
Pregunta 14
Pregunta
Combined cycle cogeneration refers to which of the following?
Respuesta
-
Production of electricity from two sources utilizing one fuel source
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Production of electricity from one source utilizing two fuel sources
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Production of electricity from one source utilizing only a single fuel source
-
All of the above
-
None of the above
Pregunta 15
Pregunta
The acronym HRSG represents which of the following?
Respuesta
-
Hot reboiler steam generator
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Hot recovery steam generator
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Heat recovery steam generator
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Heater reboiler steam generator
Pregunta 16
Pregunta
Cogeneration can increase the overall plant efficiency to a value between __ and __%?
Respuesta
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30 and 40
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40 and 60
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40 and 50
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60 and 90
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95 and 100
Pregunta 17
Pregunta
Various types of simple-cycle cogeneration plants include which of the following?
Respuesta
-
Waste heat cogeneration
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Heat engine cogeneration
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Back pressure steam turbine
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Gas turbine
-
All of the above
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