选择题：
1.If the system does not exchange energy with surroundings, it is an _________
A open system
B clod system
C isolated system
D ontrol volume
2. If the temperature of the liguid is lower than the saturation emperature for the existing
pressure,it is called a_________liquid.
A superheated
B subcooled
C saturation
D dry saturated
3. If the efficiency of a real engine is significantly_______ the efficiency of a Carnot
engine between the same limits, thenadditional improvements may be possible.
A lower than
B more than
C equal to
D greater than
4. The velocity bector of a flow is expresd as V =ax2i+byztj, such a flow is a ____
dimensional flow.
A one
B two
C three
D four
5. the critical Reynolds number of a rough-walled pipe is about_______.
A 3x106
B 3x105
C 2000
D 1500
6. If _______，the density variations influence the flow and compressibility effects shuld
be accounted for;such flows are compressinle flows.
A M>0.3
B M<0.3
C M>0.2
D M>0.1
7. Any _______effects that may exist are confined to a thin layer,called a boundary
layer,that is attached to the boundary ,the velocity in a boundary laryer is always
zero at a fixed wall.
A shear
B gravitational
C inertial
D viscous
8. The ratio of the heat transfer surface area of a heat exchanger to its volume is called
the area densityβ.A heat exchanger with_______is classifiedas being compact.
A β<700m2/m3Bβ>700m2/m3Cβ>500m2/m3Dβ>1000m2/m3
9. The type of heat exchanger that involves the alternate passage of the hot and clod
fluid streams through the same flow area is the _______heat exchanger.
A regenerative
B compact Cplate and frame Dshell-and -tube
10. Not all the radiation leaving one surface will reach the other surface since
electromagnetic radiation travels in straight lines and some will be lost to the
surroundings,we introduce _______in net radiant exchange.
A reflectivity
B emissivity
C view factor
D transmissivity
11. _______u heat to conver water into steam for a variety of applications.
A Turbines
B Boilers
C Generators
D Condenrs
12. The modern 660MW coal-fired boilers has some _______tons of pressure parts.
A 600
B 2000
C 6000
D 20000
13. ______is burned in coal boilers to ignite the coal burners,to warm up the boiler and
rai pressure before coal is adimitted.
A Coal
B Gas
C Water
D Oil
14. The radiant superheater outlet temperature ______with an increasing boiler out-put.
A declines
B increas
C remains unchanged
D decreas.
15. The economizer is a ______heat exchanger for recovering enery from the flue
gas.
A parallelflow
B upstream
C downstream
D counterflow.
16. The ______utilis the heat in the boiler flue gas to heat the combustion air and
provide hot air for drying coal.
A economizer
B air heater
C reheater
D air preheater.
17. There are no boiler tubes in the ______furnace of CFB becau the rapidly moving
solids cau excessive erosion.
A topping
B lower
C upper
D middle
18. The job of the pulverizers is to ______the feed coal down to a suitable size.
A grind
B heat
C crush
D warm
19. The ball-and tube mill is a ______cylinder,partly filled with small diameter balls .
A declining
B vertical
C screwy
党建基础知识D horizontal
20. The Universal Pressure boiler is designed to maintain a ______flow inside the来开头的诗句
furance circuits to prevent furace tube overheating during all operating conditions
A maximal
B minimum
C middley
D generic
21. The steam after expending through the ______condens in the condenr at a low
press.
A turbine
B heater
C boiler
D HP cylinder
22. Machines in which there is no change of static or pressure head of the fluid in the
rotor are known as ______machine.
A reaction
B impul
C combined impul and reaction
D multi-stage
23. The ______of a turbo-machine stage is defined as the ratio of the static or
pressure head change occurring in the rotor to the total change across the stage.
A degree of reaction
B pressure
C efficiency
D enthalpy
24. For a turbine cylinder, substantial flanges and _____are required to withstand the
pressure forces at the horizontal joints.
A coupling
B pipe
C bolting
D flange warming syetem
25. With _____governing, the inlet belt is divided into ctions each controlled by a sper
–ate valve opening in quence,resulting in a more complicated casting.
A throttle
校园写真
B nozzle
C slide pressure
D constant pressure
26. _____rotors required very careful attention to shrink fit and location geometries to
avoid problems in running and with fatigue cracking.
A integral
B Monobloc
C built-up
D drum
27. _____construction has the advantage of smaller forging components at the expen
of high integrity welding.
A integral
B shrink-on disc
C sub-critical
D Welded
28. _____means that the weight is evenly dispod around the axis of the
范子文
shaft. .
A Static balance
B Dynamic balance
C balance
D Unbalance
29. If critical speed is below running speed,the shaft is regarded as _____
A rigid
B flexible
C mi-flexible
D super-critical
30 As a_____stage us approximately the same heat drop as four impul stage, it is ud
to provide a shorter and cheaper turbine ,although with some sacrifice in efficiency.
A impul
B reaction Cvelocity-compounded D single
单词及词组
aiabatic
baffle
blade
boiler
boundary layer
Carnot cycle
composition
compressibility
马不停蹄的意思
condensation
conduction
convenction
diffusion
dry saturated vapor
emissivity
equilibrium
friction loss
internal combustion engine
intropic
isobaric
isolated system
isometric
isothermal
laminar
manuscript
moisture
molecule
pathline
pump
quality
渴的成语radiation
Rankine cycle
Reversible
Saturation
steady
streamline
subcooled liquid
superheated vapor
surrounding
turbulent
ultrasonic
vacuum
viscous
Anchor 支座，固定Atomized 雾化Blast 鼓风
Blowdown 排污
Axis 轴
Circulating fluidized bed CFB循环流化床锅炉Compressor 压缩机、压气机
Coordinated 坐标，定位
Counterflow 逆流（换热器）
Creep strength 蠕变强度
Critical pressure 临界压力
Deterioration 恶化
粮票价格Distortion 变形
Distillate 馏出物
Drainage 疏水
Drum 汽包
Economizer 省煤器
Erosive 侵蚀的，腐蚀的
Embrittlement 脆性，脆化
Evaluate 评估，评价
Ferrite 铁素体
Furnace 炉膛
Generator 发电机
Govern 控制、调节
Hydraulic 水力的，液压的
Ignite 点火
Inert 惰性
Ingredients 成分
Inorganic 无机的
Limestone 石灰石
Margin 裕量，安全系数
Mill 磨煤机
Organisms 有机体
Heterogeneous 不均匀的
Hydraulic 水力的，液压的
Ignite 点火
精准扶贫政策Plasma spray coating 等离子喷涂
Impurity 杂质
Prefabricated 预制的
Inert 惰性
Inferior 低级的，劣质的
Ingredients 成分
Premium fuel 优质燃料
Oxidation 氧化
Polymer 聚合物
Porosity多空的
Radius 半径，范围
Retract缩回
Resonant 共振
Reynolds number 雷诺数
Rare earth element 稀土元素Regulate 控制，调节
Rigid 刚性的，紧密地
Rollers 辊子
Regenerator 回热器，蓄热器Sootblower 吹灰器
Saturated 饱和的
Stress corrosion 应力腐蚀Superheater 过热器Temperature-entropy 温熵图Tenacious 黏的Thermodynamics 热力学Turbine 汽轮机
Viscosity 黏度
Velocity 速度
Wear磨损
Welded 焊接
Access
Asmbly
Back press
Balance piston
Bearing box
Blower
Boundary layer
Brittle fracture
Carrier ring
Casing
Cast
Chord
Convergent-divergent type nozzle Coupling
Coverband
Crane
Double-shell casing
Ductility
Dynamic balance
Fabrication
Fatigue cracking
Fixed blade
Flexible rotor
Forging
