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Power prep quiz 7

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power engineering 3b2 Quiz on Power prep quiz 7, created by TRAVIS CANNING on 28/02/2016.
TRAVIS CANNING
Quiz by TRAVIS CANNING, updated more than 1 year ago
TRAVIS CANNING
Created by TRAVIS CANNING about 8 years ago
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Resource summary

Question 1

Question
Early gas turbines were handicapped by
Answer
  • metal not being able to withstand high speed centrifugal forces
  • the inability to get enough air into the combustion chamber
  • metals not standing the high temperatures involved
  • their high operating speeds
  • their inadequate power cabability

Question 2

Question
The temperature to which the air can be raised at the turbine inlet is
Answer
  • an indication of a units power
  • directly related to the unit's size
  • a function of the air compressor input
  • an indication of the units efficiency
  • improper for proper compressor performance

Question 3

Question
The output power of a gas turbine is directly related to the
Answer
  • mass of gas passing though the turbine per second
  • temperate at the turbine inlet
  • mass of the unit
  • slippage between the turbine and compressor
  • turbine exhaust temperature

Question 4

Question
The low installation cost of a gas turbine is
Answer
  • due to cheap materials in the blades
  • due to short fuel lines
  • because no fuel pump is required
  • because no electrical wiring is required
  • because less auxillary equipment is needed

Question 5

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

Question 6

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

Question 7

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 8

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 high capacity system

Question 9

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 10

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

Question 11

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 12

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 13

Question
The output power on a gas turbine increases when its colder outside because:
Answer
  • cooling water requirements 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 14

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 15

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 16

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

Question 17

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

Question 18

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 19

Question
A gas turbine operates on the
Answer
  • otto cycle
  • daltons law
  • brayton cycle
  • Charles law
  • diesel

Question 20

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

Question 21

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 22

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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