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power prep quiz 6

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power engineering 3b2 Quiz on power prep quiz 6, created by TRAVIS CANNING on 27/02/2016.
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
Some of the characteristics which make the gas turbine a better choice over other prime movers are 1. low maintenance 2. minimum cooling water 3. high thermal efficiency 4. rapid start-up and loading
Answer
  • 1,2,3,4
  • 1,2,3
  • 1,2,4
  • 1,3,4
  • 2,3,4

Question 2

Question
The air side of a gas turbine regenerator is located
Answer
  • before the compressor
  • after the combustion chamber
  • between the turbine and combustion chamber
  • downstream of the compressor

Question 3

Question
A gas turbine performs most effectively if
Answer
  • lube oil is of the proper viscosity
  • cooling water temperature is kept low
  • ambient air temperature is high
  • ambient air temperature is low
  • loaded immediately after starting

Question 4

Question
A combined steam and gas turbine arrangement can be termed
Answer
  • an ideal system
  • a cogeneration system
  • a once through system
  • ideal relative to system efficiency
  • a higher capacity system

Question 5

Question
The purpose of a regenerator is
Answer
  • to clean the exhaust gases
  • to improve the efficiency of the turbine
  • to increase the temperature in the combustion chamber
  • to lower the temperature in the combustion chamber
  • to recirculate the exhaust gases back through the compressor

Question 6

Question
A __________ is suitable for use in unmanned and remote locations
Answer
  • steam turbine plant
  • cogeneration plant
  • gas turbine system
  • nuclear plant
  • thermal generating plant

Question 7

Question
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
Answer
  • 1,2,3
  • 2,3,4,5,6
  • 1,2,4,6,
  • 1,3,4
  • 1,2,3,4,5,6

Question 8

Question
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
Answer
  • 1,2
  • 2,3,4
  • 1,2,4
  • 1,2,3
  • 1,2,3,4

Question 9

Question
The output power on a gas turbine increases when its colder outside because
Answer
  • cooling water requiremetns are lower
  • colder air has the ability to hold more moisture
  • higher compressor volumetric efficiency
  • mass flow of the incoming air is greater
  • all of the above

Question 10

Question
A ________ gas turbine system uses the same working fluid over and over again.
Answer
  • open cycle
  • dual shaft
  • closed cycle
  • regenerator
  • emergency power

Question 11

Question
The major components of a gas turbine system include.
Answer
  • low pressure compressor, turbine and duxt burner
  • compressor, combustor and regenerator
  • compressor, combustor and turbine
  • starting motor, oil coolers and flux capacitor
  • generator, compressor, turbine and combustor

Question 12

Question
Two stage compression is used in a gas turbine system to:
Answer
  • increase turbine output
  • reduce the size of the machine
  • lower the amount of fuel consumed
  • reduce maintenance costs
  • increase the compressor life

Question 13

Question
A regenerator in a gas turbine cycle is located:
Answer
  • between the combustor and the turbine
  • between air compressor stages
  • prior to air compression
  • between the compressor and the combustor
  • at the turbine outlet

Question 14

Question
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
Answer
  • 1,2,3,4,6
  • 1,2,3,4,5
  • 2,3,4,5,6
  • 1,3,5
  • 1,2,3,5

Question 15

Question
A gas turbine operatos on the:
Answer
  • otto cycle
  • Daltons law
  • brayton cycle
  • Charles law
  • diesel

Question 16

Question
Remote gas turbines may be started by: 1. mechanical linkages 2. telephone 3. radio link 4. tiber relays
Answer
  • 2,3
  • 1,2
  • 3,4
  • 1,4
  • 2,4

Question 17

Question
In a total energy arrangement a gas turbine may exhaust its flue gas to 1.HRSG 2. waste heat boiler 3. atmosphere 4. SAGD
Answer
  • 1,2
  • 1,3
  • 2,4
  • 1,4
  • 1,2,4

Question 18

Question
A gas turbine may be used as a prime mover to operate:
Answer
  • air compressors
  • fire pumps
  • generators
  • emergency equipment
  • all of the above
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