4661236
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
While gas turbines exist in many different designs, every gas turbine has three major components, compressor section, combustion section, and:
Respuesta
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Turbine section
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Shell section
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Steam section
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Low pressure section
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High pressure section
Pregunta 2
Pregunta
Ambient air entering the combustion chamber is first pressurized to about (?) Kpa
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50 to 100
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500 to 1000
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1100 to 3000
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3000 to 5000
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5000 to 10000
Pregunta 3
Pregunta
In the single shaft arrangements the compressor, turbine and load are all connected and rotate
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Opposite of one another
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Counterclockwise
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Clockwise
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Together
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None of the above
Pregunta 4
Pregunta
A disadvantage of a closed style gas turbine is:
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Cooling water is needed
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The working fluid is dirty
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Only cheap fuel can be used
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The working fluid may support combustion
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Low pressure, Low output
Pregunta 5
Pregunta
A gas turbine installation involves a number of additional components, systems and equipment that vary widely depending on the type of gas turbine, its location, environmental conditions and:
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Cost
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Size
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Application
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Pressure rating
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None of the above
Pregunta 6
Pregunta
Many gas turbines are contained in an enclosure that protects it from the environment, provides protection for personnel in case of failure and:
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Keeps costs down
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Keep it clean
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Prevent damage
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Reduce noise
Pregunta 7
Pregunta
Modern gas turbines are able to reach efficiencies of (?) in simple cycle mode without the cycle improvements or combined cycle:
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5-10%
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15-20%
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25-30%
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35-40%
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45-50%
Pregunta 8
Pregunta
On a gas turbine the most common cycle improvements to be made is:
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Inter cooling
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After cooling
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Reheating
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Combined cycle
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Regeneration
Pregunta 9
Pregunta
A highly efficient and capable compressor is critical for the efficient operation of a gas turbine. Two types of compressors are used in gas turbines are Centrifugal and:
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Differential
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Positive flow
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Negative flow
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Radial
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Axial
Pregunta 10
Pregunta
Advantages of the radial or compressor are simplicity, short length and:
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Cost
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Size
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Strength
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Noise reduction
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Power
Pregunta 11
Pregunta
For a gas turbine there are three basic designs for combustors. The can-annular, annular and:
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Annular-can
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Can
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Single can
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Double can
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None of the above
Pregunta 12
Pregunta
About (?) per cent of the air entering the combustor is mixed with the fuel in the flame tube as combustion air; the remainder flows on the outside of the tube and services as cooling air.
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10
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20
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30
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40
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50
Pregunta 13
Pregunta
Turbines can be of the axial-flow or (?) type:
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Differential flow
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Radial flow
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Radial inflow
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Axial inflow
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None of the above
Pregunta 14
Pregunta
What is used in blade cooling on a gas turbine?
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Air
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Oxygen
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Nitrogen
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Fans
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All of the above
Pregunta 15
Pregunta
An automatic emergency trip system closes the main fuel shutoff valve if:
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The Lubricating oil pressure drops to an unsafe pressure
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The exhaust temperature exceeds the allowable limit
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Either of the rotor speed becomes excessive
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All of the above
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None of the above
Pregunta 16
Pregunta
A number of protective devices will first alarm and then shutdown the engine if certain levels are exceeded. They normally protect against:
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Power turbine overspeed
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Exhaust gas temperatures higher than the maximum limit
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Excessive vibration
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Excessive oil and bearing temperatures
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All of the above
Pregunta 17
Pregunta
The temperature of the air entering the gas turbine has a great impact on its operation and performance. As the air temperature decreases, its
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Density decreases
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Density increases
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Pressure increases
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None of the above
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Pressure decreases
Pregunta 18
Pregunta
A gas turbine will produce more power at:
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Higher temperatures
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Lower temperatures
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Higher pressures
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Lower pressures
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All of the above
Pregunta 19
Pregunta
All lubricating systems provide two basic functions, to lubricate sliding surfaces in the bearing and:
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Keep the bearing clean
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Cool the bearings
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Keep water away
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Reduce corrosion
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All of the above
Pregunta 20
Pregunta
Gas turbines use two different types of bearings, Antifriction bearings and:
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Greased bearings
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Roller
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Ball
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Radial
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Rotor
Pregunta 21
Pregunta
Maintenance of fuel gas systems are relatively maintenance free and automatic protection is usually provided. Maintenance operators may do consist of:
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Checking for fuel gas leaks
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Monitoring pressure and temperature
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Changing fuel filters
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Calibrating instrumentation and testing protective devices
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All of the above
Pregunta 22
Pregunta
Fuel for a gas turbine that would promote the most efficient combustion and produce the lowest environmental emissions world be:
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Methane
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Ammonia
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Natural gas
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Fuel gas
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Kerosene
Pregunta 23
Pregunta
A gas turbine can operate on a wide range of liquid fuels such as blended heavy distillantes, residuals and heavy ash crudes, and:
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Distillantes
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Blended ash crudes
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Low ash crudes
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All of the above
-
None of the above
Pregunta 24
Pregunta
A liquid fuel which requires considerable cleaning and treatment would be:
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Kerosene
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Distillants
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Low ash crudes
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Blended heavy distillants
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Heavy ash crudes
Pregunta 25
Pregunta
NOx Emissions are formed during combustion from the reaction of:
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Water or steam
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Soda ash
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Lime
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Air
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None of the above
Pregunta 26
Pregunta
What system can be used to provide the initial rotation of the main compressor?
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Pneumatic starters using compressed air or gas
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Electric motors
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Small diesel engines
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Steam turbine expanders
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All of the above
Pregunta 27
Pregunta
What problems to sagging or bowing cause in a gas turbine?
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Prevent start up
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High vibration
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Excessive heat
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A and B
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None of the above
Pregunta 28
Pregunta
Various methods of inlet cooling used today are spray cooling, fog cooling and:
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Special evaporative pads
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Steam cooling
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Water pan cooling
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Forced Air cooling
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Natural air cooling
Pregunta 29
Pregunta
Anti-icing systems may operate by:
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Beating off the ice
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Installing heating coils
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Feeding heated air from some other source into air intake
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B and C
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None of the above
Pregunta 30
Pregunta
In an internal combustion engine what are the three major types of fuels?
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Gasoline, Diesel, and kerosene
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Gasoline, Natural gas, Gaseous fuels
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Gasoline, Fuel oils, and Diesel
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Gasoline, Gaseous fuels, and Fuel oils
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None of the above
Pregunta 31
Pregunta
For a normal shutdown of a gas turbine the procedure is basically the reverse of a startup procedure.
Respuesta
- True
- False
Pregunta 32
Pregunta
When a fast shutdown for a gas turbine has been initiated the cooldown period is eliminated and the fuel valve is closed immediately.
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- True
- False
Pregunta 33
Pregunta
To perform an off-line waterwash, the engine is stopped and does not need to cool first.
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- True
- False
Pregunta 34
Pregunta
To perform an on-line wash the gas turbine is slowed slightly and has no need to cool.
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- True
- False
Pregunta 35
Pregunta
One major difference in a diesel engine compared to the gasoline engine is:
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One engine is larger then the other
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Gasoline engines do not require a spark for ignition
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Gasoline engines require compression for ignition
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Diesel engines do not require a spark for ignition
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All of the above
Pregunta 36
Pregunta
How many camshafts are there in a Combustion engine?
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1
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2
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3
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4
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5
Pregunta 37
Pregunta
A cylinder head on a combustion engine is made of:
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Special Heat resisting cast iron
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Aluminum
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Steal
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Heat treated nickel iron alloy
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Heat treated Steal
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