Let’s all answer Question 48: Basic knowledge of mechanical equipment-related fields

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This post was last edited by zx9527007 on 2009-9-5 01:29. 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 spring-loaded safety valve uses the pressure of a spring as the forcing force; the opening pressure of the safety valve is adjusted by changing the magnitude of this spring pressure using adjustment screws or nuts. In some spring-loaded safety valves, an adjustment ring is provided outside the valve seat; by adjusting the position of this ring, it is possible to change the flow cross-sectional area of the safety valve. 2. The piston rings of a piston compressor achieve sealing through flow guidance and throttling. 3,45 steel is a high-quality carbon structural steel with an average carbon content of 4.5%. 4. Automotive transmission gears generally undergo carburizing chemical heat treatment. 5. The most traditional and accurate method for determining the chemical composition of metal materials is the flame method. 6. Before the crane enters a live area to carry out operations, insulating measures should be taken for components such as the boom and the control cabin; during operation, a dedicated person should be assigned to monitor safety on site. 7. After completing the operation of the truck crane, the outriggers and boom must be retracted first, followed by the retraction of the boom’s outriggers. 8. Carbon steel can be classified into carbon structural steel and carbon tool steel based on their uses. The former is primarily used for manufacturing various structural components and machine parts, and it generally falls under low-carbon and medium-carbon steels ； The latter is used to manufacture cutting tools, measuring instruments, molds, etc., and is generally high-carbon steel. 9. The tower support is the connecting part that fixes the tower to the foundation, and saddles are generally used for this purpose. 10. The pressure test refers to the hydraulic or pneumatic test conducted during the shutdown inspection of pressure vessels, at a pressure higher than the maximum operating pressure. Answers for issue 48: √××√× √×√×√. 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 submission is valid. If answers from the same IP address are found to be similar, strict action will be taken. Everyone is welcome to continue participating 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