Relax a bit – here’s a trivia question

1. The basic policy for work safety in our country is ______. Safety first, prevention foremost. 2. According to national statistics on accidents and injuries, the construction industry has an accident rate second only to the mining industry. The \"five major types of injuries\" that occur most frequently in the construction industry are ______, ______, ______, ______, and ______. Falls from height, electric shock, object strikes, mechanical injuries, collapses. 3. New employees must undergo pre-job \"three-level\" training, which refers to ______, ______, ______. Corporate training, project-based training, team training. 4. In the event of an accident, it must be reported to superiors immediately; no concealment is allowed. Investigation, analysis, and handling should be carried out in accordance with the \"Four Nos for Improvement\" principle. “The “Four Nos” refer to ______, ______, ______, ______. 5. On March 25, 1995, the State Council issued Order No. 174, deciding to implement a working system of ______ hours per day and ______ hours per week starting from May 1, 1995. 8 hours, 40 hours. 6. Minors refer to workers who are at least __16__ years old but under __18__ years old; they shall not be assigned to perform work involving toxic or harmful substances or particularly strenuous physical labor, and night shifts that require overtime work are prohibited for them. 7. All workers who are directly involved in work on live electrical circuits must wear ______ and must wear ______ to prevent electric shock accidents. Insulated shoes, insulated gloves. 8. A clear sign should be placed at the location where fire-fighting equipment is kept on the construction site; colored warning lights should be used at night. The fire-fighting equipment must be placed on a raised surface, and no items are allowed to be stored within ______ meters around it. 3m 9. In the event of an electrical fire at the construction site, the power supply must be cut off first, and extinguishing agents such as sand, carbon dioxide, \"1211\" or __dry powder__ fire extinguishers should be used; water and ___foam___ fire extinguishers must not be used. 10. The Ministry of Construction stipulates: “It is strictly prohibited to go to work __after drinking____.” 11. The primary and secondary wires of the welding machine must be equipped with additional protection against electric shock. The length of the primary wire shall not exceed 5 mm (it must not be dragged on the ground), while the length of the secondary wire should be less than _30m_____m. The connections must be made firmly through crimping. 12. The operating switch for the rammer must be a __directional__ switch; ___reversing__ switches are strictly prohibited. The power inlet should be equipped with a protective rubber ring. 13. Class II tools not only have an insulated power supply unit, but their housing is also insulating; in other words, they feature double insulation, and the tool’s nameplate is marked with the words __return____. 14. Wear a safety helmet when entering the construction site? It must be correct. 15. For temporary electrical installations at construction sites, the __TN-S__ system must be used, with a dedicated __protective neutral wire__ provided. It is required to use five-core cables and adopt a distribution system based on __three-level power distribution and two-level protection__. 16. When the excavation depth exceeds __2m ____ m, two protective railings must be installed around the area, and red warning lights should be placed in dangerous areas at night. 17. When the depth of an excavated pit (trench) exceeds ___1.5m ___m, it is necessary to provide slope stabilization and reliable support based on the soil conditions and depth. 18. Electrical equipment used in construction must be equipped with leakage protectors, and the lighting used for work beneath holes must operate at a safe voltage of __24V ____V or less. 19. When working on the side of high-voltage lines, a horizontal distance of at least __6m ____m must be maintained. If this distance cannot be achieved, isolation measures must be taken to prevent metal tools used by workers from coming into contact with the high-voltage lines and causing electric shock accidents. 20. Cable joints must be handled in accordance with the provisions of “_Temporary Uses at Construction Sites_____”, with tight and secure wrapping as well as reliable insulation. 21. The switch box should be protected from rain and dust and locked: the typical installation height (above the ground) is __1.5m ____m, and its distance from the fixed electrical equipment it controls should not exceed _3m _____ m. 22. JGJ46-88 stipulates that all electrical equipment at the construction site must be equipped with _leakage protectors_, and these protectors must be installed at the beginning of the load circuit of the electrical equipment. 23. When the installation height of the lighting circuits and fixtures indoors at the construction site is below _2.4m _____ m, a safe voltage of 36V should be used. 24. The voltage of the hand-held lighting devices (flashlights) used at construction sites should be a safe voltage of __36V ____V. 25. The enclosure of the iodine-tungsten lamp should be provided with _neutral (grounding)_____ protection. 26. Lighting fixtures should be installed at a distance of more than 30 cm from flammable materials, and the installation height should be no less than _3m _____m. 27. Safe voltage refers to a range of voltages supplied by specific power sources to prevent electric shock accidents; it is divided into five levels: __42____ V, _36__ V, __24____ V, ____12__ V, and __6____ V. Depending on the different working conditions, an appropriate safe voltage is selected. 28. Work carried out at heights where a fall is possible from a reference level at ___2___ m or more above ground. 29. When working at heights, it is necessary to strictly comply with the \"Technical Specifications for Safety in High-Height Work in Building Construction\" (hereinafter referred to as the \"JGJ80-91 Specifications\"). 30. The perimeter of high-altitude work platforms must be equipped with protective railings that are 1–1.2 meters high; fine-mesh safety nets should be installed outside these railings, and the bottom part of the platforms should have guardrails that are 18 cm high. 31. The equipment used at construction sites for transporting materials up and down is called __vertical transportation__ equipment. 32. Oxygen and acetylene at construction sites are hazardous materials; when storing and using them, they must be kept at a distance of __10m ___m from open flames. 33. Code JGJ59-99 prohibits the use of horizontal nets around buildings, requiring instead full enclosure with vertical nets; fine-mesh safety nets must be used immediately, with the standard being that there should be __2000__ or more mesh points per 10cm × 10cm = 100cm2 area. 34. The “Safety Inspection Standards for Building Construction” JGJ59-99 came into effect on _May 1_, _1999_. 35. Our country’s fire protection policy is “_prevention first, combined with fire fighting_______”. 36. The fundamental spirit of the \"four comprehensives\" is to give top priority to safety for everyone, in every place, in all matters, and at all times. The so-called four comprehensives refer to __all employees, comprehensive coverage, the entire process, and 24/7 availability. 37. Implementing the “5S” initiative involves using people’s efforts to improve the working environment and develop good working* habits and living* habits, with the goal of increasing efficiency, enhancing the quality of employees, and ensuring safe production. “5S” refers to __organization, standardization, cleaning, tidiness, and attitude_. 38. The “three types of harm” refer to not harming others, not harming oneself, and not being harmed by others. 39. The three major regulations refer to the \"Regulations on Factory Safety and Health\", the \"Regulations on Safety Techniques for Construction and Installation Projects\", and the \"Regulations on Reporting Injuries and Deaths among Workers and Employees\". 40. The safety production responsibility system is an integral part of the enterprise’s post responsibility system; it represents the most fundamental safety system in an enterprise and constitutes the core of its safety regulations. The essence of the safety production responsibility system is _safe production ； Everyone has a responsibility. 41. The criteria for assessing and issuing certificates to operators of three types of machinery are _four understandings and three skills____; the four understandings refer to: performance, purpose, structure, and principles ； Three skills: know how to operate it, know how to troubleshoot faults, and know how to perform maintenance. 42. The content of \"abide by rules and oppose violations\" is: to abide by regulations and discipline, and to oppose illegal operations as well as illegal instructions. 43. The legal representative of an enterprise is the primary person responsible for its safe production. The project manager bears ___direct leadership___ responsibility for the safe production of the project under their oversight, while the construction supervisor bears _direct_____ responsibility. 44. The “three responsibilities” system is a requirement placed on enterprise production leaders; that is, production leaders at all levels must be responsible to their ___superiors___ in terms of safe production, responsible to the __workers__, and responsible to ___themselves___. 45. The basic principle of safe production is “safety first, prevention first”; the principle for ensuring safe work for workers is __those who use them are responsible for managing them and taking accountability for them____. 46. Ensure civilized construction at the site and clean up the “five types of waste”. The five types refer to bricks, earth blocks, concrete, wood, and rebar. Last edited by eleg on 2009-4-11 08:09]

Fire safety test questions and answers 1. What is the policy regarding work safety and fire prevention? (Safety first, prevention foremost.) Prevention first, combining prevention with suppression. ) 2. What are the main causes of fires in household appliances? (Electrical short circuits, overloading, electrical leakage, poor wiring connections.) ) 3. What should be done if the escape route is blocked after a fire breaks out? (One should return inside, close the doors and windows leading to the room where the fire is burning, and pour water on them to slow down the spread of the fire; at the same time, open the windows that are not threatened by the flames in order to send out a distress signal.) ) 4. What are the basic methods and measures to prevent fires? (Effectively manage combustible materials, control sources of fire, and avoid interactions among sources of fire, combustible materials, and oxidizing agents.) ) 5. What are the types of combustibles? Give one example for each. (Solid combustibles. Such as: wood, paper, cloth, etc. Flammable liquids. Such as: gasoline, paint, alcohol, etc. Flammable gases. Such as: gas, natural gas, liquefied petroleum gas, acetylene gas, etc. ) 6. Where are signs stating “No Smoking” usually placed? (Areas with a high risk of fire ； Important places ； Areas where supplies are concentrated and where fires can cause significant damage ； Places with a high concentration of people where fires can cause heavy casualties. ) 7. What aspects should we pay attention to in areas where fire prevention is crucial? (Do not smoke in these places, and avoid using open flames casually) ； Do not bring flammable and explosive items into areas designated as fire-sensitive zones ； Strictly comply with the requirements of various safety signs and fire safety signs, adhere to all fire safety regulations, and obey the instructions of fire safety personnel ； Deter those who violate regulations and stop such violations. Maintain the fire safety of key fire prevention areas. ) 8. What types of fires are foam fire extinguishers mainly used to extinguish? (Fires caused by gasoline, kerosene, diesel, and wood, etc.) ) 9. What types of fires are gun-type fire extinguishers mainly used to combat? (They are used to extinguish incipient fires involving petroleum and its products, flammable gases, and electrical equipment.) ) 10. What types of fires are extinguished by 1211 fire extinguishers? (They are used to put out fires involving oils, electrical equipment, precision instruments, meters, books and other materials.) ) 11. What types of fires are carbon tetrachloride fire extinguishers mainly used to extinguish? (They are mainly used to extinguish fires involving electrical equipment.) ) l2. When was China’s Fire Protection Law implemented? What is the National Fire Prevention Day? (September 11, 1998) l3. What are the main categories of fire sources? Provide one example for each. (Open flames: such as matches, gas stoves, water heaters, etc.) Productive sources of fire: such as welding, car engines, industrial boilers, etc. Natural sources of fire: lightning, static electricity, etc. ) 14. What are the phone numbers for fire emergencies, traffic accidents, and medical emergencies? (119, 122, 120) 15. How often should the total weight of a 1211 fire extinguisher be checked, and when does it need to be refilled or recharged? (Every six months, by 10%). 16. Within how many minutes after a building catches fire is it the best time to extinguish the fire? (5-7 minutes.) ) 17. When is the forest fire prevention lockdown period each year? (March 15 – April 15.) ) 18. What are the basic correct actions to take in case of a fire? (Activate the alarm, evacuate, and attempt to extinguish the fire if it is safe to do so.) ) 19. To prevent fires, how should oily waste cloth and cotton fibers from the workshop be disposed of? (Place them in suitable iron barrels.) ) 20. If a fire is caused by an electrical appliance, what should be done first, if permitted? (Turn off the power switch to cut off the electricity supply ； Use fine soil, sand, carbon tetrachloride, or L2LL fire extinguishers to put out the fire. ) 21. What are the four key points for escaping a fire? (Preventing smoke inhalation ； Escape the fire scene promptly and decisively ； Find a way to escape ； Wait for him to save you. ) 22. What are the most common causes of home fires? (Improper use of fire for daily activities and household appliances, or improper handling of flammable materials.) ) 23. What precautions should be taken by motor vehicles operating and moving through forest areas? (Fire prevention devices must be installed to prevent fires caused by leaks of fire, splashing of fire, or the detachment of brake pads on the vehicle.) ) 24. What are the main causes of death in fires? (Poisoning by toxic gases, such as carbon monoxide ； Hypoxia, asphyxia ； Death from burns ； Inhale hot air. ) 25. What should be noted when reporting a fire by phone? (It is necessary to clearly state the name of the building where the fire broke out, the exact address, the details of the fire, what items are on fire, whether there is a risk of explosion, whether anyone is trapped, as well as the phone number for calling the police and the name of the person making the call.) ） 26. What to do after reporting a fire?（Send someone to wait at the entrance of the building or at street intersections for the fire truck, and guide it to the location of the fire as quickly as possible. ) 27. What are the three basic methods of extinguishing fires? (Isolation, smothering, and cooling.) ） 28. What are the six rules regarding fire prevention? (Smoking is prohibited in areas where smoking is strictly forbidden ； Fire used for production and daily life must be under the supervision of a designated person, and the amount of fire used is not allowed to exceed specified limits ； Watchmen and those on duty must fulfill their responsibilities and are not allowed to leave their posts without permission ； When installing and using electrical equipment, it is forbidden to violate the regulations ； Teach children not to play with fire ； All kinds of fire-fighting equipment and extinguishing tools must not be damaged or misused. ） 29. What are the “five no-go rules” for fire prevention after work? (Do not leave until all matters have been clearly explained during the handover) ； Do not leave the ignition source of the fire-related equipment unextinguished ； Electrical equipment is not turned off by pulling the switch before leaving ； I won’t leave until the combustible materials are cleaned up ； If a danger is detected, one must not leave without reporting it and dealing with it properly. ) 30. What are the ways fire spreads? (Heat conduction, heat radiation, heat convection.) ) 31. What is the main cause of death in most fires? (Death due to suffocation from lack of oxygen or poisoning.) ） 32. What are the fire safety regulations in public places? (Smoking and the use of open flames are prohibited in public places) ； Do not bring flammable and explosive hazardous items such as fireworks, firecrackers, alcohol, or gasoline into public places ； Vehicles and items must not be placed in close contact with or on top of fire-fighting facilities; fire exits must not be blocked. It is strictly prohibited to misuse fire-fighting equipment, and facilities such as fire hydrants, fire doors, fire alarms, and fire sprinklers must not be damaged ； Learn to identify safety signs and be familiar with safety exits ； In the event of a fire, one should follow the unified instructions of the management at public places and evacuate to a safe area in an orderly manner. ) 33. How many forms of penalties are there for fire safety violations? (There are three: warning, fine, and detention.) ) 34. How many types of fires can be caused by welding? (Fires are caused by flying sparks, particles of molten metal and slag, as well as by flammable materials and gases located near the welding area catching fire) ； Prolonged dragging of the welding machine’s flexible cable can lead to damaged insulation and short circuits, resulting in fires; or messy wiring of the welding return circuit can also cause fires ； Fire can be caused by damaged insulation of the welding machine itself or its power cable, leading to short circuits and overheating. ) 35. What should be considered when installing light bulbs? (There should be a proper safety distance between the light bulb and flammable materials; it is strictly forbidden to use paper or cloth as lampshades or to cover the bulbs ； Explosion-proof lights should be installed in flammable and explosive areas ； The ballasts of lighting fixtures such as fluorescent lamps must not be installed on flammable materials or inside ceilings. ) 36. In what situations can smoking easily cause a fire? (Smoking in bed or on a sofa, especially after being drunk or overly tired) ； Some cigarettes left lying around, still lit ； Work while smoking ； Throwing cigarette butts and matchsticks carelessly ； Smoking while repairing, cleaning cars or machinery ； Put the unextinguished cigarette butt in your pocket ； Smoking in areas where smoking is strictly prohibited. ) 37. What is the simplest way to put out a fire in a frying pan? (Cover the pan with a lid, or pour something into it.) ) 38. When covering a burning television with a blanket or quilt, where should one stand and why? (Stand behind the side of the television to prevent the cathode ray tube from bursting and injuring people.) ) 39. What types of fires cannot be extinguished with carbon dioxide fire extinguishers? (It cannot be used to extinguish fires involving metals such as aluminum, sodium, potassium, magnesium, lithium, antimony, cadmium, uranium, plutonium, and their hydrides, nor can it be used to extinguish fires involving substances that supply their own oxygen in an inert atmosphere.) ) 40. Which of those substances are flammable and explosive? (It can be roughly divided into six categories: explosive substances ； Flammable and combustible liquids ； Flammable and oxidizing gases ； Substances that can catch fire on contact with water and air ； Oxidizers (substances that can form oxides or cause combustion) ； Flammable materials. ）

I. Fill-in-the-blank questions: 1. In the \"four comprehensives\" safety management approach, the \"four comprehensives\" refer to all employees, comprehensive coverage, the entire process, and 24/7 monitoring. 2. The work site must be well-ventilated, with no flammable or explosive materials present. The distance between various types of gas cylinders and open flames must be more than 10 meters. 3. The distance between the oxygen cylinder and the acetylene cylinder must be more than 5 m. Smoking is prohibited at the work site. 4. Any work location that is more than 2 meters above the ground (floor) is considered high-altitude work. When working at heights, it is necessary to follow the safety procedures for working at heights. 5. Guardrails (105 cm in height) must be installed at lift shafts, openings of various sizes, stairs, platforms, and walkways. At the entrances and exits, the railings should be easy to remove for use and can be reinstalled promptly afterward. It is strictly forbidden to throw items from a height. 6. In key fire prevention areas, open flames and smoking are prohibited. When electric or gas welding is necessary for maintenance or other work, approval from the fire department must be obtained, and necessary preventive measures must be taken before work can proceed. 7. No one is allowed to pass under or stay under lifted loads. No one is allowed to stand on lifted objects. 8. Welding equipment and tools must have good insulation. The welder’s enclosure must be grounded, and two-wire operation is required. 9. When inspecting equipment, the power-off and tag-out system must be strictly followed, and a dedicated person shall be assigned to supervise the process. 10. When working at heights, tools and equipment must not be placed on the edge of the work area. A sling should be used to transfer the object. It is strictly prohibited to throw tools and equipment up or down. II. Short-answer questions: 1. What is the theme of the 100-day safety campaign? Answer: Strong awareness, opposition to violations, identification of potential hazards, prevention of accidents, and ensuring safety. 2. What is the duration of the 100-day safety campaign? Answer: April 23, 2008 – July 31, 2008. 3. What was the theme of the Safety Production Month campaign? Answer: Addressing potential hazards and preventing accidents. 4. What does the concept of the “four skills” in fire safety work refer to? Answer: First, call the fire department; second, use a fire extinguisher; third, extinguish incipient fires; fourth, organize evacuation. 5. Three violations: giving illegal instructions, carrying out illegal operations, and violating labor discipline. 6. Four principles of not causing harm: not harming others, not being harmed by others, not harming oneself, and protecting others from harm. 7. Simultaneous implementation: Safety facilities must be designed, constructed, and put into use simultaneously with the main project. 8. Three rights: Employees have the right to stop illegal operations and refuse to follow unlawful instructions ； In the event of a hazard at the work site, there is the right to immediately stop working and retreat to a safe location ； When the hazard has not been addressed and personal safety cannot be guaranteed, one has the right to refuse to carry out the task. 9. Three principles for safe production: No production if it is not safe ； Production will not commence until potential hazards are eliminated ； Production will not proceed unless safety measures are implemented. III. Essay Questions 1. What is the principle of \"not letting go of four things\"? Answer: We will not let go until the cause of the accident is clarified, until those responsible for the accident are identified, until preventive measures against such accidents are put in place, and until both the responsible parties and the general public have received appropriate education ； 2. What is the usage method of a portable dry powder fire extinguisher? Answer: A portable dry powder fire extinguisher should be used at a distance of about 5 meters from the burning material. The procedure is as follows: first tear off the small lead weight, pull out the safety pin, then press down the handle with one hand while lifting the fire extinguisher ； Hold the nozzle in the other hand and direct the dry powder jet at the burning area. When using a portable dry powder fire extinguisher to put out a fire, it is important to keep the extinguisher in an upright position and direct the powder stream at the base of the burning flame. When using it outdoors, be sure to spray from the upwind direction, and as the range decreases, gradually move closer to the burning area to improve the fire-fighting efficiency. 3. How should a seat belt be used correctly? Answer: (1) The safety belt should be worn high and used low, taking care to prevent swaying and collisions ； (2) Do not remove any components from the safety belt arbitrarily; be careful to use cable ties when replacing it ； (3) Do not use the hanging rope with knots; the hook should be attached to the loop on the rope, not directly to the rope itself ； (4) Avoid sharp objects before use, and do not come into contact with open flames or corrosive substances such as acids and bases

Electrical Safety I. Multiple-choice Questions ● When current flows into the ground at a grounding point, a voltage drop is generated in the soil surrounding that grounding point. The voltage that appears between a person’s feet around the grounding point is called (A). A: Step voltage B: Step potential C: Critical voltage D: Fault voltage ● The power-frequency current of (D) can cause a fatal electric shock. A: Milliamps B: Milliamps C: Hundreds of milliamps D: Tens of milliamps ● When a device leaks electricity due to damage to its casing, the electric shock that occurs when a person comes into contact with the device’s metal casing is referred to as (B). A: Direct contact electric shock B: Indirect contact electric shock C: Static electric shock D: Contactless electric shock ● From the perspective of preventing electric shock, insulation, shielding, and spacing are safety measures to prevent (D). A: Electromagnetic field injury B: Indirect contact electric shock C: Static electric shock D: Direct contact electric shock ● Connecting the metal parts of electrical equipment that are not charged under normal conditions to the protective neutral wire of the power grid is referred to as (B). A: Protective grounding B: Protective neutral grounding C: Working grounding D: Working neutral grounding ● Protective neutral grounding belongs to the (C) system. A: IT B: TT C: TN D: Three-phase three-wire system. ● The voltage of portable lights must not exceed (A) V. In particularly humid areas or on surfaces with good electrical conductivity, and in situations where the working area is confined such as inside boilers or metal containers, making movement difficult, the voltage of portable lights must not exceed (A) V. A: 36 ； 12 B: 50 ； 42 C: 110 ； 36 D: 50 ； 36 ● In systems with protective neutral connection, the working neutral wire, which is also the neutral line, is usually denoted by ( ) ； The protective neutral wire, also known as the protective conductor, is usually denoted by ( ). If a wire serves both as the working neutral and the protective neutral, it is indicated with ( ). A: N ； PEN ； PE B: PE ； N ； PEN C: N ； PE ； PEN D: PEN ； N ； PE Answer: C ● The main purpose of a leakage protection device is ( ). A: Preventing electric shock incidents. B: Preventing power supply interruptions. C: Reducing line losses. D: Preventing electrical fire accidents. Answer: A, D. ● Installing lightning rods, lightning conductors, lightning grids, and lightning belts are all main measures for protecting ( ). A: Lightning intrusion wave B: Direct lightning strike C: Backstroke D: Secondary discharge Answer: B ● ( ) is the main measure used by various power distribution and transformation devices to protect against lightning intrusion waves. A: Use (valve-type) arresters. B: Use lightning rods. C: Use lightning strips. D: Use lightning meshes. Answer: A. ● Under normal circumstances, the human body’s resistance can be considered as ( ). A: 50~100Ω B: 800~1000Ω C: 100~500 kΩ D: 1~5 MΩ Answer: B ● ( ) Electrical equipment is equipment that can withstand the explosion of explosive mixtures inside it without being damaged, and that prevents internal explosions from causing explosions in external explosive mixtures through any joints or structural openings in its casing. A: Increased safety type B: Inherently safe type C: Flameproof type D: Oil-filled type. Answer: C. ● A residual current device is considered to be of high sensitivity if its rated residual current operating current is within ( ). A: 30mA~1A B: 30mA and below C: Above 1A D: Below 1A Answer: B ● When it is difficult to insulate electrical equipment or the insulation provided is not sufficient to ensure safety, protective measures should be taken. Power distribution and transformation equipment should be equipped with proper shielding devices, and the height of such barriers should not be less than ( ). A: 1.4m B: 1.7m C: 2.0m D: 2.4m Answer: B ● In order to ensure that a fault current path is formed under fault conditions, thereby providing the conditions for automatic disconnection, the protective conductor must be ( ) during use. A: Interrupts are allowed B: Interrupts are not allowed C: Connection to switching electrical equipment is allowed D: Automatic shutdown. Answer: B ● Which of the following power sources can be used as a safe power source? A: Autotransformer B: Voltage divider C: Battery D: Safety isolation transformer. Answer: C, D. ● The symbol “ Back” is an auxiliary marker for ( ). A: Basic insulation B: Double insulation C: Functional insulation D: Shielding Answer: B ● Overhead lines should not cross ( ). A: Buildings with combustible materials used for their roofs. B: Roads. C: Navigable rivers. D: Cable cars. Answer: A ● Among the following insulating safety tools, which ones belong to auxiliary safety tools? A: Insulating rod B: Insulating baffle C: Insulating boots D: Insulating pliers Answer: C ● Using safely low voltage is a measure of ( ). A: Protection only against direct contact electric shock B: Protection only against indirect contact electric shock C: Used to prevent explosion and fire hazards D: Protection against both direct and indirect contact electric shock. Answer: D ● At the point where the power supply lines enter a building, it is necessary to connect the PE main conductor, the grounding main conductor, the main water pipes, the main gas pipes, as well as the vertical pipes for heating and air conditioning. It is also advisable to connect the building’s metal components and other metal pipes as well. This measure is called ( ). A: Overload protection B: Main equipotential bonding C: Non-conductive environment D: Auxiliary equipotential bonding Answer: B ● When the gas explosion hazard zone is classified as Zone 0 or Zone 1, and the minimum ignition energy of the combustible materials is below ( ), workers should wear work clothing that poses no risk of static electricity ignition. Cotton work clothes can be worn when the relative humidity of the environment remains above 50%. A: 0.25mJ B: 0.025mJ C: 0.0025mJ D: 0.00025mJ Answer: A ● Explosive gas environments are classified based on the frequency and duration of the presence of explosive gas mixtures. A: Zones 0, 1, and 2 B: Zones 10 and 11 C: Zones 21, 22, and 23 D: Groups T1–T6 Answer: A II. True or False Questions ● Buildings should be classified into three categories based on their importance, purpose of use, likelihood of lightning strikes, and the consequences thereof, in accordance with lightning protection requirements. Answer: (√) ● Buildings that manufacture, use, or store large quantities of **, **, detonators, explosives, and other such materials, and which are prone to explosions caused by electric sparks, thus resulting in severe damage and casualties, should be classified as Category II lightning protection buildings. Answer: (×) (Note: It should be classified as Category 1.) ● All types of lightning protection buildings shall adopt measures to protect against direct lightning strikes and the intrusion of lightning waves. Answer: (√) ● When using the ball-movement method to determine the protection area of lightning arresters for Category III lightning protection buildings, the ball radius to be used should be 45 m. Answer: (×) (Note: It should be 60 m.) ● The location of the substation should not be directly above or below areas with explosion hazards, nor directly above or below areas with fire hazards. When it is adjacent to buildings in areas with explosion or fire hazards, it must comply with the provisions of the current **standard, ‘Code for Design of Electrical Installations in Explosive and Fire Hazardous Environments’. Answer: (√) ● The fire resistance rating of the fuel-immersed power transformer room is grade II. Answer: (×) (Note: It should be level 1.) ● The doors of transformer rooms, distribution rooms, and capacitor rooms should open outward. When there is a door between adjacent switchgear rooms, this door shall be capable of opening in both directions. Answer: (√) ● Transformer rooms, distribution rooms, capacitor rooms, etc., should be equipped with facilities to prevent rain, snow, as well as small animals such as snakes and rats from entering the rooms through lighting windows, doors, cable trenches, etc. Answer: (√) ● The heating devices in control rooms and power distribution rooms may be equipped with flanges, threaded connections, and valves. Answer: (×) (Note: There should be no flanges, threaded joints, or valves.) ) ● Mobile power tools and hand-held power tools should be equipped with highly sensitive leakage protectors. Answer: (√) ● Compared to corrosive environments, substations and distribution stations should be located on the upwind side of the wind direction with the lowest frequency throughout the year. Answer: (×) (Note: It should be located downwind of the wind direction with the lowest frequency throughout the year.) ) ● In explosive gas environments where flammable substances are heavier than air, the indoor floor of substations, distribution stations, and control rooms located in Zone 1 or Zone 2 should be 0.3 m higher than the outdoor floor level. Answer: (×) (Note: It should be 0.6m above the outdoor ground level. ) ● Overhead lines of 10 kV and below must not cross areas with explosive gases; the horizontal distance between such overhead lines and these areas should be at least equal to the height of the utility poles. Answer: (×) (Note: It should be no less than 1.5 times the height of the tower.) ● In areas with fire hazards, electrical circuits installed along unplastered wooden ceilings and walls, as well as those within wooden false ceilings, should be run exposed in steel pipes. Answer: (√) ● For exposed live parts with a nominal voltage exceeding 36V AC that are easily accessible, protective covers or enclosures must be provided, and their protection rating should not be lower than IP2X. Answer: (×) (Note: The nominal voltage should be above 25V AC (r.m.s.)…) ● Personnel working in explosive hazard areas should wear anti-static (conductive) shoes to prevent electric charge buildup on the body, and the floor should also be made of a conductive material. Answer: (√) ● The emergency operation time of fire emergency lighting fixtures should be no less than 60 minutes, and also no less than the emergency operation time specified by the fixture itself. This post was last edited by eleg on 2009-4-11 08:19

1. The basic policy for work safety in our country is __safety first, prevention first__. 2. According to national statistics on accidents and injuries, the construction industry has an accident rate second only to the mining industry. The “five most common types of injuries” in this industry are falls from heights, electric shocks, injuries caused by falling objects, mechanical injuries, and collapses. 3. New employees must undergo “three levels” of training before starting work; these three levels refer to company-level training, project-specific training, and team-level training. 4. In the event of an accident, it must be reported immediately to superiors without any concealment, and investigations and resolutions must be carried out in accordance with the principle of “no improvement without investigation”. “The \"Four Nos\" principle means that an incident will not be left unaddressed until its cause has been identified; those responsible for the incident will not be left unpunished; all employees will not be educated until appropriate actions are taken; and preventive measures will not be implemented until they are in place. 5. On March 25, 1995, the State Council issued Order No. 174, deciding to implement a working system of __8__ hours per day and __40__ hours per week starting from May 1, 1995. 6. Minor workers refer to workers who are at least ___16_ years old but under __18_ years old; they shall not be assigned to perform work involving toxic or harmful substances or particularly strenuous physical labor, and night shifts involving overtime work are prohibited for them. 7. All workers who are directly involved in work on live electrical circuits must wear _insulated shoes_ and _insulated gloves_ to prevent electric shock accidents. 8. A clear sign should be placed at the location where fire-fighting equipment is kept on the construction site; colored warning lights should be used at night. The fire-fighting equipment must be placed on a raised surface, and no items are allowed to be stored within __3___ meters of it. 9. In the event of an electrical fire at the construction site, the power supply should be cut off first, and sand, carbon dioxide, \"1211\" or __dry powder__ fire extinguishers should be used to put out the fire; water and __foam__ fire extinguishers must not be used. 10. The Ministry of Construction stipulates: “Working __while drunk__ is strictly prohibited.” 11. The primary and secondary wires of the welding machine must be equipped with additional protection against electric shock; the length of the primary wire shall not exceed 5 m (it must not be dragged on the ground), while the length of the secondary wire should be less than 30 m. The connections must be made firmly using compression fittings. 12. The operating switch for the rammer must be a __directional__ switch; __reversing__ switches are strictly prohibited. The power inlet should be equipped with a cable protection ring. 13. Class II tools not only have an insulated power supply unit, but their casing is also insulating, meaning they possess double insulation; the tool’s nameplate is marked with the words __round__. 14. Must a safety helmet be worn (correctly) when entering the construction site? 15. For temporary electrical installations at construction sites, the __TN-S__ system must be used, with a dedicated __protective neutral wire__ provided. Five-core cables should be employed, and a __three-level power distribution with two levels of protection__ system is required. 16. When the excavation depth exceeds __2___ m, two protective railings must be installed around the area, and red warning lights should be placed in dangerous areas at night. 17. When the depth of an excavated pit (trench) exceeds ___1.5__ m, slope stabilization and reliable support must be provided based on the soil conditions and depth. 18. Electrical equipment used in construction must be equipped with leakage protectors, and the lighting used for work beneath holes must operate at a safe voltage of __24__V or less. 19. When working on the side of high-voltage lines, a horizontal distance of at least __6___ meters must be maintained. If this distance cannot be achieved, isolation measures must be taken to prevent metal tools used by the workers from coming into contact with the high-voltage lines and causing electric shock accidents. 20. Cable joints must be handled in accordance with the provisions of the __JGJ46-88 Code__ or the Code for Temporary Electrical Installations at Construction Sites; they must be wrapped tightly and securely, with reliable insulation. 21. The switch box should be protected from rain and dust and locked: its typical installation height (above the ground) is __1.5__ m, and the distance to the fixed electrical equipment it controls should not exceed ___3__ m. 22. JGJ46-88 stipulates that all electrical equipment at the construction site must be equipped with __leakage protectors__, which shall be installed at the beginning of the load circuit of the electrical equipment. 23. When the installation height of the lighting circuits and fixtures indoors at the construction site is below __2.4__ m, a safe voltage of 36V should be used. 24. The voltage of the hand-held lighting devices (flashlights) used at construction sites should be the safe voltage of __36__ V. 25. The enclosure of the iodine-tungsten lamp should be provided with _neutral (ground)__ protection. 26. Lighting fixtures should be installed at a distance of more than 30 cm from flammable materials, and the installation height should be no less than __3__ meters. 27. Safe voltage refers to a series of voltages supplied by specific power sources to prevent electric shock accidents; it is divided into five levels: __42___ V, ___36___ V, ___24___ V, ___12___ V, and ___6___ V. Depending on the different working conditions, an appropriate safe voltage is selected. 28. Any work carried out at heights where a fall is possible, at a height of __2___ m or more above the reference level for falling heights. 29. When working at heights, it is necessary to strictly comply with the \"__Safety Technical Specifications for High-Height Work in Building Construction__\" (hereinafter referred to as the \"JGJ80-91 Specifications\"). 30. The perimeter of high-altitude work platforms must be equipped with protective railings that are at a height of __1~1.2__ meters; fine-mesh safety nets should be installed outside these railings, and the bottom part of the platform should have guardrails that are 18 cm high. 31. The equipment used at construction sites for transporting materials up and down is called __vertical transportation__ equipment. 32. Oxygen and acetylene at construction sites are hazardous materials; when storing and using them, they must be kept at a distance of __10__ meters from open flames. 33. Code JGJ59-99 prohibits the use of horizontal nets around buildings, requiring instead full enclosure with vertical nets; fine-mesh safety nets must be used immediately, with the standard being that there should be __2000__ or more mesh points per 10cm × 10cm = 100cm2 area. 34. The “Safety Inspection Standards for Building Construction” JGJ59-99 came into effect on __May 1, __1999__. 35. China’s fire protection policy is “___prevention first, combined with fire fighting___”. 36. The basic spirit of the \"four comprehensives\" is to give top priority to safety for everyone, in every place, in everything, and at all times; the so-called four comprehensives refer to all personnel, in all aspects, throughout the entire process, and around the clock. 37. Implementing the “5S” initiative involves using people’s efforts to improve the working environment and develop good working* habits and living* habits, with the aim of increasing productivity, enhancing the quality of employees, and ensuring safe production. “5S” refers to sorting, organizing, cleaning, standardizing, and discipline. 38. The “three types of harm” refer to not harming others, not harming oneself, and not being harmed by others. 39. The three major regulations refer to the Regulations on Factory Safety and Health, the Technical Regulations on Safety in Construction and Installation Projects, and the Regulations on Reporting Injuries and Deaths of Workers and Employees. 40. The safety production responsibility system is an integral part of the enterprise’s post responsibility system; it represents the most fundamental safety system in an enterprise and constitutes the core of safety regulations and rules. The essence of the safety production responsibility system is that _everyone is responsible for ensuring safe production_. 41. The standards for assessing and issuing certificates to operators of three types of machinery are __four understandings and three skills__, with the specific details being _four understandings: performance, purpose, structure, and principle_ ； Three skills: know how to operate it, know how to troubleshoot faults, and know how to perform maintenance. 42. The content of \"abide by one and oppose two\" is: abide by rules and disciplines, oppose illegal operations, and oppose illegal commands. 43. The corporate legal person is the primary responsible party for safety in enterprise operations. The project manager bears ____direct leadership____ responsibility for the safe production of the project under their oversight, while the construction supervisor bears ___direct___ responsibility. 44. The “three responsibilities” system is a requirement placed on enterprise production leaders; that is, production leaders at all levels must be responsible to their ___superiors___ in terms of safe production, responsible to the __workers__, and responsible to ___themselves___. 45. The basic principle of safe production is “safety first, prevention first”; the principle for ensuring safe work for workers is ___whoever uses them is responsible for their management and safety____. 46. Ensure civilized construction at the site and clean up the “five types of waste”. The five types refer to bricks, earth blocks, concrete, wood, and rebar. There are too many; let’s answer these first