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Power prep quiz 7
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Questions in this quiz (22)
1Early gas turbines were handicapped by
- Ametal not being able to withstand high speed centrifugal forces
- Bthe inability to get enough air into the combustion chamber
- Cmetals not standing the high temperatures involved
- Dtheir high operating speeds
- Etheir inadequate power cabability
2The temperature to which the air can be raised at the turbine inlet is
- Aan indication of a units power
- Bdirectly related to the unit's size
- Ca function of the air compressor input
- Dan indication of the units efficiency
- Eimproper for proper compressor performance
3The output power of a gas turbine is directly related to the
- Amass of gas passing though the turbine per second
- Btemperate at the turbine inlet
- Cmass of the unit
- Dslippage between the turbine and compressor
- Eturbine exhaust temperature
4The low installation cost of a gas turbine is
- Adue to cheap materials in the blades
- Bdue to short fuel lines
- Cbecause no fuel pump is required
- Dbecause no electrical wiring is required
- Ebecause less auxillary equipment is needed
5Some 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- A1,2,3,4
- B1,2,3
- C1,2,4
- D1,3,4
- E2,3,4
6The air side of a gas turbine regenerator is located
- Abefore the compressor
- Bafter the combustion chamber
- Cbetween the turbine and the combustion chamber
- Dbetween the turbine and atmosphere
- Edownstream of the compressor
7A gas turbine performs most effectively if
- Alube oil is of the proper viscosity
- Bcooling water temperature is kept low
- Cambient air temperature is high
- Dambient air temperature is low
- Eloaded immediately after starting
8A combined steam and gas turbine arrangement can be termed
- Aan ideal system
- Ba cogeneration system
- Ca once through system
- Dideal relative to system efficiency
- Ea high capacity system
9The purpose of a regenerator is
- Ato clean the exhaust gases
- Bto improve the efficiency of the turbine
- Cto increase the temperature in the combustion chamber
- Dto lower the temperature in the combustion chamber
- Eto recirculate the exhaust gases back through the compressor
10A _________ is suitable for use in the unmanned and remote locations
- Asteam turbine plant
- Bcogeneration plant
- Cgas turbine system
- Dnuclear plant
- Ethermal generating plant
11Gas 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- A1,2,3
- B2,3,4,5,6
- C1,2,4,6
- D1,3,4
- E1,2,3,4,5,6
12Disadvantages 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- A1,2
- B2,3,4
- C1,2,4
- D1,2,3
- E1,2,3,4
13The output power on a gas turbine increases when its colder outside because:
- Acooling water requirements are lower
- Bcolder air has the ability to hold more moisture
- Chigher compressor volumetric efficiency
- Dmass flow of the incoming air is greater
- Eall of the above
14A ________ gas turbine system uses the same working fluid over and over again
- Aopen cycle
- Bdual shaft
- Cclosed cycle
- Dregenerator
- Eemergency power
15The major components of a gas turbine system include
- Alow pressure compressor, turbine and duxt burner
- Bcompressor, combustor and regenerator
- Ccompressor, combustor and turbine
- Dstarting motor, oil coolers and flux capacitor
- Egenerator, compressor, turbine and combustor
16Two stage compression is used in a gas turbine system to:
- Aincreased turbine output
- Breduce the size of the machine
- Clower the amount of fuel consumed
- Dreduce maintenance costs
- Eincrease the compressor life
17A regenerator in a gas turbine cycle is located:
- Abetween the combustor and the turbine
- Bbetween the compressor stages
- Cprior to air compression
- Dbetween the compressor and the combustor
- Eat the turbine outlet
18A 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- A1,2,3,4,6
- B1,2,3,4,5
- C2,3,4,5,6
- D1,3,5
- E1,2,3,5
19A gas turbine operates on the
- Aotto cycle
- Bdaltons law
- Cbrayton cycle
- DCharles law
- Ediesel
20Remote gas turbines may be started by:
1. mechanical linkages 2. telephone
3. radio link 4. timer relays- A2,3
- B1,2
- C3,4
- D1,4
- E2,4
21In a total energy arrangement a gas turbine may exhaust its flue gas to:
1. HRSG 2. waste heat boiler 3. atmosphere 4. SAGD- A1,2
- B1,3
- C2,4
- D1,4
- E1,2,4
22A gas turbine may be used as a prime mover to operate:
- Aair compressors
- Bfire pumps
- Cgenerators
- Demergency equipment
- Eall of the above
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- power engineering 3b2 Quiz on Power prep quiz 7, created by TRAVIS CANNING on 28/02/2016.
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- TRAVIS CANNING
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- English
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