Let’s all answer question 49: Basic knowledge of mechanical equipment-related fields

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This post was last edited by zx9527007 on 09/06/2009 at 00:25. This event is organized to help all HaiChuan members review their mechanical theory knowledge; we hope everyone will participate actively! True or False: 1. A turbine is a rotary power machine that converts the energy of steam into mechanical work. Also known as a steam turbine. It is mainly used as a prime mover for power generation, and can also directly drive various pumps, fans, compressors, and ship propellers. The exhaust steam or intermediate extraction steam from the turbine can also be used to meet the heating needs for production and daily life. Turbines are classified by their operating principle into condensing turbines and back-pressure turbines. 2. After the safety valve is reinstalled, if there are stop valves present, the operator should fully open the stop valves before and after it and apply lead seals to them. 3. The function of key coupling is mainly to achieve radial fixation between shafts and to transmit torque. 4. For positive displacement pumps, the change in the sealed volume is the fundamental reason for liquid suction and discharge. 5. The main function of the balance device in a centrifugal pump is to counteract and reduce centrifugal force. 6. The most dangerous form of degradation in stainless steel is intergranular corrosion. 7. The basic indicators of the mechanical properties of steel include strength, hardness, fatigue strength, impact toughness, and plasticity. 8. The grade of lubricating oil refers to its density. 9. In a crank-rocker mechanism, those with the crank as the driving element may exhibit slipping behavior ； Mechanisms with a rocker as the driving element may have dead center positions. 10. Cranes that use wire ropes for amplitude control shall be equipped with amplitude limiting devices, but devices to prevent the boom from tilting backward may not be necessary. Answers for issue 49: ×√×√× √√×××. When replying, please choose hidden mode; see the instructions for hiding. Note: Be careful when posting – edits are invalid ； Answers from the same IP address are accepted, but only the first one is valid. If answers from the same IP address are found to be similar, strict action will be taken. Everyone is welcome to continue to participate actively. If you have any questions or suggestions, please post them in the feedback thread. Starting from issue 17, those who answer all questions correctly can come here to claim their prizes; those who answer all questions correctly will receive their prizes