4661236
Descrição
Quiz por TRAVIS CANNING, atualizado more than 1 year ago
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Criado por TRAVIS CANNING
aproximadamente 8 anos atrás
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Questão 1
Questão
While gas turbines exist in many different designs, every gas turbine has three major components, compressor section, combustion section, and:
Responda
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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
-
High pressure section
Questão 2
Questão
Ambient air entering the combustion chamber is first pressurized to about (?) Kpa
Responda
-
50 to 100
-
500 to 1000
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1100 to 3000
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3000 to 5000
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5000 to 10000
Questão 3
Questão
In the single shaft arrangements the compressor, turbine and load are all connected and rotate
Responda
-
Opposite of one another
-
Counterclockwise
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Clockwise
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Together
-
None of the above
Questão 4
Questão
A disadvantage of a closed style gas turbine is:
Responda
-
Cooling water is needed
-
The working fluid is dirty
-
Only cheap fuel can be used
-
The working fluid may support combustion
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Low pressure, Low output
Questão 5
Questão
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:
Responda
-
Cost
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Size
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Application
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Pressure rating
-
None of the above
Questão 6
Questão
Many gas turbines are contained in an enclosure that protects it from the environment, provides protection for personnel in case of failure and:
Responda
-
Keeps costs down
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Keep it clean
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Prevent damage
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Reduce noise
Questão 7
Questão
Modern gas turbines are able to reach efficiencies of (?) in simple cycle mode without the cycle improvements or combined cycle:
Responda
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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%
Questão 8
Questão
On a gas turbine the most common cycle improvements to be made is:
Responda
-
Inter cooling
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After cooling
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Reheating
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Combined cycle
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Regeneration
Questão 9
Questão
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:
Responda
-
Differential
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Positive flow
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Negative flow
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Radial
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Axial
Questão 10
Questão
Advantages of the radial or compressor are simplicity, short length and:
Responda
-
Cost
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Size
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Strength
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Noise reduction
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Power
Questão 11
Questão
For a gas turbine there are three basic designs for combustors. The can-annular, annular and:
Responda
-
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
Questão 12
Questão
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.
Responda
-
10
-
20
-
30
-
40
-
50
Questão 13
Questão
Turbines can be of the axial-flow or (?) type:
Responda
-
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
Questão 14
Questão
What is used in blade cooling on a gas turbine?
Responda
-
Air
-
Oxygen
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Nitrogen
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Fans
-
All of the above
Questão 15
Questão
An automatic emergency trip system closes the main fuel shutoff valve if:
Responda
-
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
-
None of the above
Questão 16
Questão
A number of protective devices will first alarm and then shutdown the engine if certain levels are exceeded. They normally protect against:
Responda
-
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
Questão 17
Questão
The temperature of the air entering the gas turbine has a great impact on its operation and performance. As the air temperature decreases, its
Responda
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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
-
Pressure decreases
Questão 18
Questão
A gas turbine will produce more power at:
Responda
-
Higher temperatures
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Lower temperatures
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Higher pressures
-
Lower pressures
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All of the above
Questão 19
Questão
All lubricating systems provide two basic functions, to lubricate sliding surfaces in the bearing and:
Responda
-
Keep the bearing clean
-
Cool the bearings
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Keep water away
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Reduce corrosion
-
All of the above
Questão 20
Questão
Gas turbines use two different types of bearings, Antifriction bearings and:
Responda
-
Greased bearings
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Roller
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Ball
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Radial
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Rotor
Questão 21
Questão
Maintenance of fuel gas systems are relatively maintenance free and automatic protection is usually provided. Maintenance operators may do consist of:
Responda
-
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
Questão 22
Questão
Fuel for a gas turbine that would promote the most efficient combustion and produce the lowest environmental emissions world be:
Responda
-
Methane
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Ammonia
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Natural gas
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Fuel gas
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Kerosene
Questão 23
Questão
A gas turbine can operate on a wide range of liquid fuels such as blended heavy distillantes, residuals and heavy ash crudes, and:
Responda
-
Distillantes
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Blended ash crudes
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Low ash crudes
-
All of the above
-
None of the above
Questão 24
Questão
A liquid fuel which requires considerable cleaning and treatment would be:
Responda
-
Kerosene
-
Distillants
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Low ash crudes
-
Blended heavy distillants
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Heavy ash crudes
Questão 25
Questão
NOx Emissions are formed during combustion from the reaction of:
Responda
-
Water or steam
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Soda ash
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Lime
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Air
-
None of the above
Questão 26
Questão
What system can be used to provide the initial rotation of the main compressor?
Responda
-
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
-
All of the above
Questão 27
Questão
What problems to sagging or bowing cause in a gas turbine?
Responda
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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
Questão 28
Questão
Various methods of inlet cooling used today are spray cooling, fog cooling and:
Responda
-
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
Questão 29
Questão
Anti-icing systems may operate by:
Responda
-
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
-
None of the above
Questão 30
Questão
In an internal combustion engine what are the three major types of fuels?
Responda
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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
Questão 31
Questão
For a normal shutdown of a gas turbine the procedure is basically the reverse of a startup procedure.
Responda
- True
- False
Questão 32
Questão
When a fast shutdown for a gas turbine has been initiated the cooldown period is eliminated and the fuel valve is closed immediately.
Responda
- True
- False
Questão 33
Questão
To perform an off-line waterwash, the engine is stopped and does not need to cool first.
Responda
- True
- False
Questão 34
Questão
To perform an on-line wash the gas turbine is slowed slightly and has no need to cool.
Responda
- True
- False
Questão 35
Questão
One major difference in a diesel engine compared to the gasoline engine is:
Responda
-
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
-
All of the above
Questão 36
Questão
How many camshafts are there in a Combustion engine?
Responda
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1
-
2
-
3
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4
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5
Questão 37
Questão
A cylinder head on a combustion engine is made of:
Responda
-
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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