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3b2 quiz 3

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power engineering 3b2 Quiz on 3b2 quiz 3, created by TRAVIS CANNING on 26/02/2016.
TRAVIS CANNING
Quiz by TRAVIS CANNING, updated more than 1 year ago
TRAVIS CANNING
Created by TRAVIS CANNING over 8 years ago
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Resource summary

Question 1

Question
While gas turbines exist in many different designs, every gas turbine has three major components, compressor section, combustion section, and:
Answer
  • Turbine section
  • Shell section
  • Steam section
  • Low pressure section
  • High pressure section

Question 2

Question
Ambient air entering the combustion chamber is first pressurized to about (?) Kpa
Answer
  • 50 to 100
  • 500 to 1000
  • 1100 to 3000
  • 3000 to 5000
  • 5000 to 10000

Question 3

Question
In the single shaft arrangements the compressor, turbine and load are all connected and rotate
Answer
  • Opposite of one another
  • Counterclockwise
  • Clockwise
  • Together
  • None of the above

Question 4

Question
A disadvantage of a closed style gas turbine is:
Answer
  • Cooling water is needed
  • The working fluid is dirty
  • Only cheap fuel can be used
  • The working fluid may support combustion
  • Low pressure, Low output

Question 5

Question
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:
Answer
  • Cost
  • Size
  • Application
  • Pressure rating
  • None of the above

Question 6

Question
Many gas turbines are contained in an enclosure that protects it from the environment, provides protection for personnel in case of failure and:
Answer
  • Keeps costs down
  • Keep it clean
  • Prevent damage
  • Reduce noise

Question 7

Question
Modern gas turbines are able to reach efficiencies of (?) in simple cycle mode without the cycle improvements or combined cycle:
Answer
  • 5-10%
  • 15-20%
  • 25-30%
  • 35-40%
  • 45-50%

Question 8

Question
On a gas turbine the most common cycle improvements to be made is:
Answer
  • Inter cooling
  • After cooling
  • Reheating
  • Combined cycle
  • Regeneration

Question 9

Question
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:
Answer
  • Differential
  • Positive flow
  • Negative flow
  • Radial
  • Axial

Question 10

Question
Advantages of the radial or compressor are simplicity, short length and:
Answer
  • Cost
  • Size
  • Strength
  • Noise reduction
  • Power

Question 11

Question
For a gas turbine there are three basic designs for combustors. The can-annular, annular and:
Answer
  • Annular-can
  • Can
  • Single can
  • Double can
  • None of the above

Question 12

Question
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.
Answer
  • 10
  • 20
  • 30
  • 40
  • 50

Question 13

Question
Turbines can be of the axial-flow or (?) type:
Answer
  • Differential flow
  • Radial flow
  • Radial inflow
  • Axial inflow
  • None of the above

Question 14

Question
What is used in blade cooling on a gas turbine?
Answer
  • Air
  • Oxygen
  • Nitrogen
  • Fans
  • All of the above

Question 15

Question
An automatic emergency trip system closes the main fuel shutoff valve if:
Answer
  • The Lubricating oil pressure drops to an unsafe pressure
  • The exhaust temperature exceeds the allowable limit
  • Either of the rotor speed becomes excessive
  • All of the above
  • None of the above

Question 16

Question
A number of protective devices will first alarm and then shutdown the engine if certain levels are exceeded. They normally protect against:
Answer
  • Power turbine overspeed
  • Exhaust gas temperatures higher than the maximum limit
  • Excessive vibration
  • Excessive oil and bearing temperatures
  • All of the above

Question 17

Question
The temperature of the air entering the gas turbine has a great impact on its operation and performance. As the air temperature decreases, its
Answer
  • Density decreases
  • Density increases
  • Pressure increases
  • None of the above
  • Pressure decreases

Question 18

Question
A gas turbine will produce more power at:
Answer
  • Higher temperatures
  • Lower temperatures
  • Higher pressures
  • Lower pressures
  • All of the above

Question 19

Question
All lubricating systems provide two basic functions, to lubricate sliding surfaces in the bearing and:
Answer
  • Keep the bearing clean
  • Cool the bearings
  • Keep water away
  • Reduce corrosion
  • All of the above

Question 20

Question
Gas turbines use two different types of bearings, Antifriction bearings and:
Answer
  • Greased bearings
  • Roller
  • Ball
  • Radial
  • Rotor

Question 21

Question
Maintenance of fuel gas systems are relatively maintenance free and automatic protection is usually provided. Maintenance operators may do consist of:
Answer
  • Checking for fuel gas leaks
  • Monitoring pressure and temperature
  • Changing fuel filters
  • Calibrating instrumentation and testing protective devices
  • All of the above

Question 22

Question
Fuel for a gas turbine that would promote the most efficient combustion and produce the lowest environmental emissions world be:
Answer
  • Methane
  • Ammonia
  • Natural gas
  • Fuel gas
  • Kerosene

Question 23

Question
A gas turbine can operate on a wide range of liquid fuels such as blended heavy distillantes, residuals and heavy ash crudes, and:
Answer
  • Distillantes
  • Blended ash crudes
  • Low ash crudes
  • All of the above
  • None of the above

Question 24

Question
A liquid fuel which requires considerable cleaning and treatment would be:
Answer
  • Kerosene
  • Distillants
  • Low ash crudes
  • Blended heavy distillants
  • Heavy ash crudes

Question 25

Question
NOx Emissions are formed during combustion from the reaction of:
Answer
  • Water or steam
  • Soda ash
  • Lime
  • Air
  • None of the above

Question 26

Question
What system can be used to provide the initial rotation of the main compressor?
Answer
  • Pneumatic starters using compressed air or gas
  • Electric motors
  • Small diesel engines
  • Steam turbine expanders
  • All of the above

Question 27

Question
What problems to sagging or bowing cause in a gas turbine?
Answer
  • Prevent start up
  • High vibration
  • Excessive heat
  • A and B
  • None of the above

Question 28

Question
Various methods of inlet cooling used today are spray cooling, fog cooling and:
Answer
  • Special evaporative pads
  • Steam cooling
  • Water pan cooling
  • Forced Air cooling
  • Natural air cooling

Question 29

Question
Anti-icing systems may operate by:
Answer
  • Beating off the ice
  • Installing heating coils
  • Feeding heated air from some other source into air intake
  • B and C
  • None of the above

Question 30

Question
In an internal combustion engine what are the three major types of fuels?
Answer
  • Gasoline, Diesel, and kerosene
  • Gasoline, Natural gas, Gaseous fuels
  • Gasoline, Fuel oils, and Diesel
  • Gasoline, Gaseous fuels, and Fuel oils
  • None of the above

Question 31

Question
For a normal shutdown of a gas turbine the procedure is basically the reverse of a startup procedure.
Answer
  • True
  • False

Question 32

Question
When a fast shutdown for a gas turbine has been initiated the cooldown period is eliminated and the fuel valve is closed immediately.
Answer
  • True
  • False

Question 33

Question
To perform an off-line waterwash, the engine is stopped and does not need to cool first.
Answer
  • True
  • False

Question 34

Question
To perform an on-line wash the gas turbine is slowed slightly and has no need to cool.
Answer
  • True
  • False

Question 35

Question
One major difference in a diesel engine compared to the gasoline engine is:
Answer
  • One engine is larger then the other
  • Gasoline engines do not require a spark for ignition
  • Gasoline engines require compression for ignition
  • Diesel engines do not require a spark for ignition
  • All of the above

Question 36

Question
How many camshafts are there in a Combustion engine?
Answer
  • 1
  • 2
  • 3
  • 4
  • 5

Question 37

Question
A cylinder head on a combustion engine is made of:
Answer
  • Special Heat resisting cast iron
  • Aluminum
  • Steal
  • Heat treated nickel iron alloy
  • Heat treated Steal
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