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多选题 If there is greater variation of initial pressure, the impact of safety is

A. The steam humidity increases at the last stage

B. The stress of governing stage blades is danger at the full load

C. Governing stage is safety at any time

D. The working conditions deteriorate at the last stage

汽轮机设备及系统（AISEC）课程封面

学科：汽轮机设备及系统（AISEC）

时间：2025-06-13 00:50:06

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题目1
单选题
The conversion of steam heat to kinetic energy in impulse stage is in the ()
A. nozzleB. nozzle and bladeC. moving bladeD. cylinder
题目2
多选题
The efficiency of a turbine include
A. Mechanical efficiencyB. Wheel efficiencyC. Relative internal efficiencyD. Stage efficiency
题目3
多选题
If there is greater variation of initial pressure, the impact of safety is
A. The steam humidity increases at the last stageB. The stress of governing stage blades is danger at the full loadC. Governing stage is safety at any timeD. The working conditions deteriorate at the last stage
题目4
多选题
When the steam flow rate decrease for condensing turbine, the pressure ratio
A. Increase in governing stageB. Decrease in final stageC. Decrease in governing stageD. Increase in final stage
题目5
多选题
Which description about the thermal process line is true
A. The steam flux is showedB. There is a ideal line about stageC. The process parameter in moving blade is showedD. The ideal enthalpy drop of nozzle can be known
题目6
多选题
The method of compound sliding pressure governing in 300MW turbine is
A. above 280 MW, constant pressureB. below 80 MW, sliding pressureC. below 80 MW, constant pressureD. above 280 MW, sliding pressure
题目7
多选题
The balancing methods of axial thrust are
A. Wheel balance holeB. Axial thrust bearingC. Balancing pistonD. Reverse arrangement
题目8
多选题
The optimum speed ratio's physical meaning is
A. leaving-velocity loss is minimalB. The wheel efficiency is maximalC. The wheel efficiency is minimalD. Leaving-velocity is minimal
题目9
多选题
For the stage group, the correct is
A. Multiple blades arranged sequentially can form groupsB. The steam velocity through the stage group is the sameC. Multiple blades can form a groupD. The steam flow through the stage group is the same
题目10
多选题
Steam flow velocity triangle consist of
A. peripheral velocity(u)B. absolute velocity(C1)C. relative velocity(w1)D. absolute velocity(C0)
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