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Power prep material
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Preguntas del test (27)
1The two classifications of steam turbines include:
- Ainduction and extraction
- Bcondensing and non-condensing
- Cimpulse and reaction
- Dcompound and cross-compound
- Eall of the above
2The two types of steam turbines include
- Ainduction and extraction
- Bcondensing and non-condensing
- Cimpulse and reaction
- Dcompound and cross-compound
- Eall of the above
3Impulse turbine blades
- Acreate considerable end thrust
- Bconvert heat energy into kinetic energy
- Care either bucket shape or nozzle shaped
- Dconvert kinetic energy into useful work
- Eare typically used in the low pressure stages of a turbine
4Reaction turbine blades
- Aare nozzle shaped
- Bare bucket shaped
- Care a combination of bucket and nozzle shaped
- Dproduce little end thrust
- Eall of the above
5The pressure remains constant across the moving blades of an impulse turbine
- AVerdadero
- BFalso
6The force applied to the blade is caused by changing the direction of the stream flow in an impulse turbine
- AVerdadero
- BFalso
7Steam pressure drops across the moving blades of an impulse turbine
- AVerdadero
- BFalso
8In a reaction turbine the steam pressure drops in both the stationary and rotating blades
- AVerdadero
- BFalso
9In a reaction turbine the steam expands in the moving blades producing a reaction force
- AVerdadero
- BFalso
10In a reaction turbine the velocity of the steam decreases in the stationary and moving blades
- AVerdadero
- BFalso
11In a reaction turbine blade clearance between the rotor and the casing must be kept at a maximum to prevent rubbing.
- AVerdadero
- BFalso
12Nozzles are used on steam turbines to
- Areduce the steam velocity to the blading
- Bincrease the enthalpy of the incoming steam
- Cprevent moisture from entering the low pressure stages of the turbine
- Dconvert heat energy into kinetic energy
- Econvert pressure energy into potential energy
13The throttling effect of steam through a turbine nozzle
- Aincreased superheat, reduces pressure and increases the steam volume
- Breduced superheat, increases pressure and increase the steam volume
- Cno change in superheat, reduces pressure and increases the steam volume
- Dincreased superheat, increased pressure, increased volume
- Eheat loss, enthalpy gain and increase in velocity
14In which type of turbine does the steam pressure drop in the nozzle and then remain constant through both the stationary and moving blades:
- Apressure compounding impulse turbine
- Breaction turbine
- Cvelocity compounded impulse turbine
- Dnon-condensing impulse turbine
- Enone of the above
15Steam velocity, blade velocity may be reduced in a multistage impulse turbine by:
1. Reducing turbine vacuum
2. pressure compounding
3. increasing blading length
4. velocity compounding- A1,2
- B2,3
- C1,3
- D2,4
- E3,4
16Compounding steam turbines is used primarily to:
1. counteract axial thrust
2. reduce turbine rotor speed
3. Reduce friction losses
4. reduce turbine blade erosion
5. reduce turbine noise- A1,3,5
- B2,3,4
- C2,3
- D1,2,3,4,5
- E2,4
17A dummy piston with balance pipe is used primarily on reaction turbines to:
- Areduce the clearance space between the blade tip and the casing
- Breduce turbine vibration
- Celiminate the use of a thrust bearing
- Doffset the end thrust produced
- Enone of the above
18A turbine thrust bearing is typically lined with a soft metal known as
- Abrass
- Bbabbit
- Clead
- Dcarbon
- Einconel
19The purpose of a thrust bearing on a steam turbine is to:
1. Absorb rotor axial thrust
2. Reduce turbine vibration
3. Prevent steam leakage
4. Reduce steam velocity
5. keep the rotor in place within the casing- A1,2,5
- B1,2,3,4
- C2,3,4,5
- D1,2,3,4,5
- E1,5
20Different types of steam turbine plants may be classified as:
- Aimpulse and reaction
- Bcompound and cross compound
- Ccondensing and non-condensing
- DSAGD and HRSG
- ESteam turbine and gas turbine
21In addition to having a high thermal cycle efficiency, condensing steam plants have the following advantage.
- Aa large amount of cooling water is required
- Blow initial cost
- Clittle space is required
- Drecovery of condensate is possible
- Eall of the above
22This type of turbine acts like a pressure reducing valve.
- ABack pressure Turbine
- BRateau Turbine
- CExtraction turbine
- DInduction turbine
- ECross-compound Turbine
23This type of steam turbine has a better overall efficiency than a purely condensing steam turbine.
- Agas turbine
- Bcross-compounded
- Ctandem double-flow
- Dbleeder turbine
- Enone of the above
24Another name for a condensing bleeder turbine would be referred to as
- Ainduction turbine
- Bclosed cycle steam turbine
- Cextraction turbine
- Dtopping turbine
- Eback pressure turbine
25This type of turbine allows new high pressure boilers to provide steam to old lower pressure systems and could also be the back pressure turbine of a cross compound system
- Agoverning turbine
- Btopping turbine
- Cinduction/extraction turbine
- Dcondensing turbine
- Ereducing station turbine
26The purpose of a coupling on a turbine is to:
- AA) compensate for axial expansion and contraction of the rotor
- BB) transmit power from one shaft to the other
- CC) keep the shaft from vibrating
- DD) both a and b
- EE) all of the above
27The following pump is utilized on a turbine rotor while on barring gear to prevent rubbing inside the bearings
- Alifting oil pump
- Bboilerfeed pump
- Chydraulic oil pump
- Djacking oil pump
Información
- Descripción
- power engineering 3b2 Test sobre Power prep material, creado por TRAVIS CANNING el 27/02/2016.
- Autor
- TRAVIS CANNING
- Idioma
- English
- Visitas
- 15
- Historial
- Creado el 27 feb 2016 · actualizado el 7 mar 2018
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