4678015
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
Early gas turbines were handicapped by
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metal not being able to withstand high speed centrifugal forces
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the inability to get enough air into the combustion chamber
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metals not standing the high temperatures involved
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their high operating speeds
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their inadequate power cabability
Pregunta 2
Pregunta
The temperature to which the air can be raised at the turbine inlet is
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an indication of a units power
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directly related to the unit's size
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a function of the air compressor input
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an indication of the units efficiency
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improper for proper compressor performance
Pregunta 3
Pregunta
The output power of a gas turbine is directly related to the
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mass of gas passing though the turbine per second
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temperate at the turbine inlet
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mass of the unit
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slippage between the turbine and compressor
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turbine exhaust temperature
Pregunta 4
Pregunta
The low installation cost of a gas turbine is
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due to cheap materials in the blades
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due to short fuel lines
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because no fuel pump is required
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because no electrical wiring is required
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because less auxillary equipment is needed
Pregunta 5
Pregunta
Some of the characteristics which make the gas turbine a better choice over other prime movers are
1. Low maintenance
2. Minimal cooling water
3. high thermal efficiency
4. rapid start-up and loading
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1,2,3,4
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1,2,3
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1,2,4
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1,3,4
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2,3,4
Pregunta 6
Pregunta
The air side of a gas turbine regenerator is located
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before the compressor
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after the combustion chamber
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between the turbine and the combustion chamber
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between the turbine and atmosphere
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downstream of the compressor
Pregunta 7
Pregunta
A gas turbine performs most effectively if
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lube oil is of the proper viscosity
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cooling water temperature is kept low
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ambient air temperature is high
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ambient air temperature is low
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loaded immediately after starting
Pregunta 8
Pregunta
A combined steam and gas turbine arrangement can be termed
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an ideal system
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a cogeneration system
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a once through system
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ideal relative to system efficiency
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a high capacity system
Pregunta 9
Pregunta
The purpose of a regenerator is
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to clean the exhaust gases
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to improve the efficiency of the turbine
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to increase the temperature in the combustion chamber
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to lower the temperature in the combustion chamber
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to recirculate the exhaust gases back through the compressor
Pregunta 10
Pregunta
A _________ is suitable for use in the unmanned and remote locations
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steam turbine plant
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cogeneration plant
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gas turbine system
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nuclear plant
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thermal generating plant
Pregunta 11
Pregunta
Gas turbine advantages include:
1. high thermal efficiency 2. lower initial cost
3. quick start-up 4. little cooling water requirements
5. power to mass ratio is high 6. remote operation
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1,2,3
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2,3,4,5,6
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1,2,4,6
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1,3,4
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1,2,3,4,5,6
Pregunta 12
Pregunta
Disadvantages of a closed cycle gas turbine include:
1. higher initial cost
2. increased cooling water requirements
3. turbine blade fouling
4. they require more creep resistant material than open cycle turbines
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1,2
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2,3,4
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1,2,4
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1,2,3
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1,2,3,4
Pregunta 13
Pregunta
The output power on a gas turbine increases when its colder outside because:
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cooling water requirements are lower
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colder air has the ability to hold more moisture
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higher compressor volumetric efficiency
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mass flow of the incoming air is greater
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all of the above
Pregunta 14
Pregunta
A ________ gas turbine system uses the same working fluid over and over again
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open cycle
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dual shaft
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closed cycle
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regenerator
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emergency power
Pregunta 15
Pregunta
The major components of a gas turbine system include
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low pressure compressor, turbine and duxt burner
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compressor, combustor and regenerator
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compressor, combustor and turbine
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starting motor, oil coolers and flux capacitor
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generator, compressor, turbine and combustor
Pregunta 16
Pregunta
Two stage compression is used in a gas turbine system to:
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increased turbine output
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reduce the size of the machine
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lower the amount of fuel consumed
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reduce maintenance costs
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increase the compressor life
Pregunta 17
Pregunta
A regenerator in a gas turbine cycle is located:
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between the combustor and the turbine
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between the compressor stages
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prior to air compression
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between the compressor and the combustor
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at the turbine outlet
Pregunta 18
Pregunta
A gas turbine is most efficient when:
1. clean fuel is used 2. turbine blades are clean
3. gas path is clean 4. lubricating oil is clean
5. ambient air temp is low 6. operated at 1/2 load
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1,2,3,4,6
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1,2,3,4,5
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2,3,4,5,6
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1,3,5
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1,2,3,5
Pregunta 19
Pregunta
A gas turbine operates on the
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otto cycle
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daltons law
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brayton cycle
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Charles law
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diesel
Pregunta 20
Pregunta
Remote gas turbines may be started by:
1. mechanical linkages 2. telephone
3. radio link 4. timer relays
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2,3
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1,2
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3,4
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1,4
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2,4
Pregunta 21
Pregunta
In a total energy arrangement a gas turbine may exhaust its flue gas to:
1. HRSG 2. waste heat boiler 3. atmosphere 4. SAGD
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1,2
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1,3
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2,4
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1,4
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1,2,4
Pregunta 22
Pregunta
A gas turbine may be used as a prime mover to operate:
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air compressors
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fire pumps
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generators
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emergency equipment
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all of the above
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