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多选题 The optimum speed ratio's physical meaning is
学科：汽轮机设备及系统（AISEC）
时间：2025-06-13 00:50:07
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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 includeA. 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 isA. 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 ratioA. 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 trueA. 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 isA. 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 areA. Wheel balance holeB. Axial thrust bearingC. Balancing pistonD. Reverse arrangement
题目8多选题
The optimum speed ratio's physical meaning isA. 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 isA. 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 ofA. peripheral velocity(u)B. absolute velocity(C1)C. relative velocity(w1)D. absolute velocity(C0)
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