A, single choice questions (***20 questions, each question 1 point. Of the alternatives to each question, only 1 is the most suitable)
?
1. The safety of mechanical equipment should be considered in two stages: the safety of mechanical products and the safety of mechanical use. At each stage, safety technical measures and safety management measures should be taken to eliminate or reduce the risks of mechanical equipment. The following mechanical equipment safety measures, do not belong to the safety technical measures is ().
A. the mechanical parts are firmly connected.
Avoid sharp edges and corners when designing.
C. materials of mechanical products have anti-corrosion function.
D. formulate safety operation procedures for mechanical equipment.
?
Check answer d
?
2. Realizing intrinsic safety is the fundamental solution to prevent mechanical injury accidents. The following mechanical safety measures, do not belong to the mechanical intrinsic safety measures is ().
A. Avoid material poisoning
B. Emergency stop device
C. Adopt safe power supply
D. Stability of the machine
?
Check answer b
?
Missing question 3
?
4. Among the casualties caused by electric shock, more than 85% of the deaths are caused by electric shock, which can be divided into single-line electric shock, double-line electric shock and step voltage electric shock. Among the behaviors of the following personnel, it is () that may cause step voltage shock.
A.a stands in the mud with his left hand and right foot touching the charged body at the same time.
B.b.' s left and right hands touch two conductors with different potentials at the same time.
When it thundered and rained, C.C. ran under the big tree to take shelter from the rain.
D. Ding stood on the concrete floor, and a part of his body touched a charged body.
?
Check answer c
?
5. Dangerous temperature, electric spark and arc are the three main causes of electrical fire and explosion, and short circuit of electrical equipment or lines is one of the main causes of dangerous temperature. In the following electrical operation or operation scenarios, () will not cause short circuit.
A. wiring errors in installation and maintenance of electrical equipment
B insulation aging of electrical equipment or lines in operation.
C. conductive dust enters the interior of electrical equipment.
D. In TT system, the three-phase load is unbalanced.
?
Check answer d
?
6. Among the following electrical protection systems, the one that belongs to PE protection zero connection is ().
A. Information technology systems
B.TT system
C.TN-C system
D.TN-S system
?
Check answer d
?
7. Grounding device consists of grounding body and grounding wire. About grounding device is wrong ().
A the metal structure of the structure reliably connected with the earth can be used as a natural grounding body.
B the natural grounding body shall have at least two wires connected to the grounding grid at different positions.
C in a non-explosive environment, when the natural grounding body has enough cross section, it is unnecessary to lay an artificial grounding wire separately.
D the metal sheath of the pipeline protective layer or the metal sheath of the cable can be used as the grounding wire.
?
Check answer d
?
8. Explosive gas environment refers to an environment where combustible gas or a mixture of steam and air is ignited and exploded under certain conditions. The use of different types of explosion-proof electrical equipment should correspond to the explosion environment. Regarding the applicable environment of different types of explosion-proof electrical equipment, the correct statement is ().
A. Class I explosion-proof electrical equipment is used in coal mine gas environment.
B. Class II explosion-proof electrical equipment is used in methane environment of coal mine.
C. Class II explosion-proof electrical equipment is used in explosive gas environment.
D. Three-level explosion-proof electrical equipment is used in explosive gas environment except coal mine gas.
?
Check answer c
?
9. Static electricity generated in the production process may lead to electric shock, even fire or explosion. The generation of static electricity is influenced by many factors. The statement about generating static electricity is correct ().
The larger the contact area, the smaller the contact pressure and the more static electricity generated.
B. V-belts generate more static electricity than flat belts.
C. The greater the air humidity, the easier it is to generate static electricity.
D. The higher the resistivity of the material, the easier it is to generate static electricity.
?
Check answer d
?
10. Grounding protection and neutral protection are the basic technical measures to prevent indirect contact and electric shock. The following electrical protection system diagram, belongs to the TN-C-S system is ().
Check answer c
?
1 1 title is missing.
?
12. Gas cylinder is a kind of refillable pressure vessel, which is used to store and transport compressed gas. The statement about gas cylinder safety accessories is correct ().
A the handwheel of nitrogen cylinder valve must have flame retardant performance.
The cover of the gas cylinder must be made of gray cast iron.
The main function of the shockproof ring is to prevent the cylinder from being directly collided.
D the safety pressure relief device of gas cylinders can only use safety pressure relief valves.
?
Check answer c
?
13. Foreman refers to the person who is engaged in ground work in hoisting machinery operation, and is responsible for the preparation, binding, hooking, unhooking and unloading of the spreader, whose work is related to the safety of the whole hoisting operation. The statement about the foreman's safety operation requirements is wrong ().
Before binding articles, sundries must be removed from the surface or cavity of the articles.
B the spreader can be prepared according to 120% of the mass of the hoisted object.
C. if the workplace is inclined, you must stand above the inclined plane to work.
D. When selecting cables, use a crane to pull the cables.
?
Check answer d
?
14 title is missing.
?
15. Regarding the ignition source control measures, the correct statement is ().
A. A plurality of open flame equipment shall be distributed at the edge of the device area and arranged centrally.
B the heating device for splashing sparks shall be arranged in the upwind direction of its process equipment.
C. When heating flammable materials, it is not allowed to use a stove or a coal stove for direct heating, but an electric stove can be used for direct heating.
D process equipment that may leak combustible gas, and open flame heating equipment is arranged in the downwind direction.
?
Check answer a
?
16. Nitrogen filling protection is an effective measure to suppress explosion. Among the following measures using nitrogen, the one that does not belong to explosion suppression measures is ().
A. nitrogen storage bottle with gas-liquid linkage valve
B. Explosion-proof electricity shall be protected by nitrogen positive pressure.
C. Nitrogen purging before maintenance of flammable and explosive systems
D. Nitrogen filling of butene storage tank
?
Check answer a
?
17. A fireworks production enterprise carried out safety production evaluation. According to the Code for Safety Design of Fireworks and Firecrackers (GBS0 16 1), the statement about the calculation of total dosage is correct ().
A the number of dangerous goods in the fence may not be included in the total.
B. The consumption of dangerous goods on the production line of the factory building may not be included in the total consumption.
C the number of dangerous goods detained may not be included in the total.
D the number of dangerous goods in the explosion-proof room may not be included in the total.
?
Check answer d
?
18. In a LPG filling station, there are four 50m3 storage tanks in the ground tank farm, the cofferdam height is 1m, there are three lightning protection towers, the storage tanks are electrostatically grounded, and the combustible gas fire detector is 10. According to Code for Design of Detection and Alarm of Combustible Gas and Toxic Gas in Petrochemical Enterprises (GB50493), the installation height of combustible gas fire detector should be far away from the ground ().
A. 1.5 m
B. 1.0m
About 0.8 meters
0.5 meters in diameter
?
Check answer d
?
19. A company is engaged in the transportation of dangerous chemicals. Before the transportation of light diesel oil, the driver and the escort shall conduct safety inspection on the diesel tank car, and confirm that there is a "dangerous goods" sign and the exhaust pipe has been installed ().
A. safety valve
B. Safety valve
C. flame arrester
D. interrupter
?
Check answer c
?
20. A company's 500m3 tar storage tank coil heater leaked, and operator A stopped, vented and steam purged the tar storage tank, and maintenance worker B entered the tar storage tank to detect and find out the leakage reason. B wear () when entering the storage tank.
A. Half-hood gas mask
B. Long pipe air respirator
C. Full mask
D. Barotropic air respirator
?
Check answer d
?
Second, the case analysis questions (case 1 are objective questions, including multiple-choice questions and multiple-choice questions, and cases 2 to 4 are subjective questions. Only the alternative of 1 in each multiple-choice question best fits the meaning of the question. There are two or more options in each multiple-choice question that meet the meaning of the question. If you choose more than one wrong item, this question won't score; if you choose less items, you will get 0.5 points for each item).
Three. D enterprise is a newly-built large-scale coal-fired power generation enterprise, with 850 employees, including safety management department, equipment support department, production site operation department and other departments. Coal for power generation mainly depends on railway transportation, and automobile transportation is the hub. Coal is stacked in the coal yard, transported to the coal bunker by the belt conveyor, and enters the coal mill by the coal feeder. Coal powder is burned in the boiler today, and the heat energy is converted into high-temperature and high-pressure steam, which enters the turbine generator and is converted into electric energy, which is transmitted to the power grid through the distribution line.
The safety technical measures set by enterprise D in the production area and equipment system include: monitoring and alarm devices for pressure, temperature and liquid level; Flammable, explosive, toxic and harmful gas monitoring and alarm device; Safety protection device of transmission machinery; Safety device of lifting equipment; Safety doors, safety valves and explosion-proof membranes for boilers and pressure vessels; Emergency stop device of coal belt conveyor; Fire fighting system of the whole plant.
D enterprise adopts ammonia nitrogen removal process. Ammonia station 1, 2 horizontal liquid ammonia tanks, 1.0MPa, 30m3 at room temperature, equipped with emergency material cabinets, and equipped with safety warning signs on site.
D Enterprise has set up a safety production committee with the general manager as the director, and held regular meetings of the safety committee to study the work of safety production. According to the requirements of "three simultaneities" of construction project safety, the enterprise entrusts a safety evaluation institution with corresponding qualifications to conduct safety acceptance evaluation, which was officially put into production in March 20 18.
18 May 18, the motor of coal-fired belt conveyor broke down, and the equipment support department arranged electricians A and B to go to repair it. After Party A and Party B handle the work permit, they enter the independent power distribution room of the belt conveyor, disconnect the power supply of the motor and leave it unlocked. Then they boarded a 2-meter-high platform for maintenance. During the maintenance process, it coincided with the shift change, and C, an employee of the production and operation department, found that the belt conveyor stopped running. Turn on the motor power again without confirmation, causing electrician A to fall off the platform after getting an electric shock and severely deform his calf. Electrician B took emergency measures according to the knowledge and skills learned in safety training.
On June 20 18, enterprise d launched a safety month activity with the theme of "life first, safe development". In view of the accident in May 15, the Safety Management Department organized all employees of the Production and Operation Department and the Equipment Support Department to conduct electrical safety training, conducted special safety inspection on the power distribution room of the belt conveyor, and put forward rectification plans for the hidden dangers found.
?
According to the above situation, answer the following questions (***22 points):
1. According to accident prevention and accident loss reduction, the safety technical measures taken by enterprise D are listed respectively.
2. List the emergency materials that should be configured in the emergency material cabinet of ammonia station.
3. Briefly describe the emergency measures that electrician B should take after Party A gets an electric shock.
4. List the main contents of safety inspection for the distribution room of belt conveyor.
?
Reference answer:
1 Measures taken. D enterprise accident prevention:
(1) pressure, temperature and liquid level monitoring and alarm device;
(2) Flammable, explosive, toxic and harmful gas monitoring and alarm device;
(3) transmission machinery safety protection device;
(4) Safety device of lifting equipment;
(6) Emergency stop device of coal belt conveyor; Measures to reduce accident losses:
(1) Safety doors, safety valves and explosion-proof membranes of boilers and pressure vessels;
(2) Fire fighting system of the whole plant.
2. List of emergency materials that should be configured in the emergency material cabinet of ammonia station:
(1) positive pressure respirator;
(2) explosion-proof emergency lights;
(3) seat belts;
(4) gas mask;
(5) Safety warning belt (warning line);
(6) Anti-static work clothes;
(7) detection alarm device;
(8) interphone;
(9) First aid kit or kit;
(10) flashlight;
(1 1) fire extinguisher;
(12) fire belt and fire axe;
(13) decontamination facilities.
3. After Party A gets an electric shock, electrician B should take emergency measures:
(1) immediately report the accident to the main person in charge of the enterprise;
(2) When someone gets an electric shock, immediately call for help around;
(3) quickly disconnect the motor power supply, rescue those who get an electric shock, and conduct preliminary rescue;
(4) Set up a danger warning zone and prohibit irrelevant personnel from entering;
(5) If the injury is serious, contact the local 120 emergency center or medical department for treatment, inform the detailed location, and send someone to wait for the ambulance at the intersection to rush to the scene for first aid.
4. The main contents of the safety inspection of the distribution room of belt conveyor:
(1) The indoor and outdoor environment is clean and tidy, and the articles are placed in an orderly manner without sundries and irrelevant articles. ;
(2) Whether there is an electrical safety management system, whether there is a full-time electrician, and whether the electrician holds a valid certificate;
(3) Check whether the operating procedures, safety measures, responsibility system and operating procedures are complete and effective;
(4) Whether there are regular inspection and maintenance records;
(5) Whether the distribution room has management signs;
(6) Whether the insulation tools are complete and effective;
(7) Whether the wiring and load are in good condition, whether the wires are selflessly connected and whether the insulation is damaged;
(8) Whether the electrical equipment in the switch cabinet (box) is clean and intact, whether the route is regular, and there should be obvious grounding wires inside and outside the box; The door is in good condition.
(9) Strictly check the food and sundries in the duty room, master control room and power distribution room to ensure a clean environment.
?
4. Enterprise E is a meat processing enterprise with an area of 12000m2 and 61employee.
E enterprise's main buildings (structures) include: comprehensive office building, dormitory building, production workshop, cold storage, boiler room, substation, refrigeration workshop, sewage treatment station, etc. The main raw and auxiliary materials include: raw meat, auxiliary materials, water, meat packaging materials, food additives and so on. The main production processes are: raw material procurement and transportation, thawing and picking, rolling and stirring, filling and molding, fumigation, packaging and refrigerated transportation. The main equipment and facilities are: 10 refrigerated truck, 4 forklifts, 4 ammonia compressors, 2 ammonia storage tanks, 1 4t/h gas boiler, 1 heat transfer oil boiler, 2 1800KVA dry-type transformers, some special equipment for meat products, and heating and cooling pipe network.
On February 20 18, in order to eliminate the hidden danger of liquid ammonia, the company changed the refrigeration process of refrigeration workshop from liquid ammonia refrigeration to carbon dioxide refrigeration, and implemented the project according to the requirements of change management.
E. Anaerobic fermentation tank of enterprise sewage treatment station is semi-closed structure, with length, width and depth of 5m×4m×4m. There are two entrances 1m× 1m at the top, which are protected by fences and have no safety warning signs. The site is equipped with 3 safety belts, 3 safety ropes, 2 lifebuoys, 1 set of electric hoist and 1 set of maintenance tools.
19, 10 At 9: 00 May, the sludge pump in the anaerobic fermentation tank failed. After the shift supervisor A found the fault, he immediately arranged the workers on duty B and C to enter the tank for maintenance. It coincided with the on-site inspection by Ding, the safety manager of the enterprise security department, and stopped the maintenance work in the pool in time. In the afternoon, the enterprise security department conducted safety education and training for all employees of the sewage treatment station.
In order to comprehensively improve the management level of enterprise safety in production, from 2065438 to June 2009, E enterprise carried out safety training for all employees and system safety inspection according to the characteristics of production and business activities, and improved the rules and regulations, operating procedures and emergency plans for safety in production.
?
According to the above situation, answer the following questions (***22 points):
1. Briefly describe the related safety requirements of manufacturing process change management in refrigeration workshop.
2. Identify the major hidden dangers in the above scenarios and explain the reasons according to the Criteria for Judging the Hidden Dangers of Major Safety Accidents in Industry and Trade Industry (version 20 17).
3. Briefly describe the safety management requirements of E enterprise sewage treatment station maintenance.
4. Briefly describe the main contents that enterprise safety management personnel should include in safety education and training for all employees of sewage treatment station.
?
Reference answer:
1. Safety requirements related to change management:
(1) The enterprise shall formulate a change management system.
(2) Before the change, analyze the change process and possible safety risks after the change.
(3) formulate control measures,
(4) Perform the approval and acceptance procedures,
(5) Inform and train relevant employees. 2. Main hidden dangers:
(1) The workplace with limited space is not marked, and obvious safety warning signs are set.
(two) without the implementation of the work approval system, unauthorized access to confined space operations. Reason:
(1) No safety warning sign is set.
(2) Monitor A on duty shall immediately arrange for workers B and C on duty to enter the pool for maintenance after discovering the fault.
3.e enterprise sewage treatment station maintenance safety management requirements:
(1) The operation approval system shall be implemented, and it is strictly forbidden to enter the limited space for operation without authorization.
(2) Before the operation, make a limited space operation plan and train the operators. You can only operate if you are qualified.
(3) The operation shall strictly abide by the principle of "ventilation first, then detection, and then operation", and it is forbidden to ventilate and detect unqualified operations.
(4) Set up obvious safety warning signs and warning instructions, and count personnel and instruments before and after operation.
(5) A guardian shall be set up at the job site, and the guardian shall not leave his post without leave and keep in touch with the workers.
(6) Personal labor protection articles or equipment such as poisoning prevention and suffocation must be provided, and safety warning signs should be set.
(7) When there is crossover operation, take measures to avoid mutual harm.
(8) Regularly detect or continuously monitor hazardous and harmful factors in the workplace.
(9) Emergency measures must be formulated and emergency equipment should be provided on site. Blind rescue is strictly prohibited.
4. The main contents of safety education and training should include:
(1) post safety operation procedures.
(2) Dangers and harmful factors in the job site.
(3) Specific safety protection measures.
Specific mutual protection and guardianship measures.
(5) The specific steps to implement the operation.
(6) Operation precautions.
(7) Emergency measures for sudden accidents.
(8) Typical accidents and case analysis.
?
V f factory is a cement production enterprise, covering an area of 300,000 square meters and having 580 employees.
The main equipment of Factory F includes: limestone warehouse, raw material storage yard, fuel warehouse, simple warehouse of cement finished products, spare parts and materials storage warehouse, and cement packaging facilities. Cement bulk facilities, maintenance workshop, power distribution room, etc. The main equipment includes: rotary kiln 1, ball mill 2, coal mill 1, classifier 4, roller press 2, high-pressure centrifugal fan 9, screw compressor 8, bridge scraper reclaimer 1, side stacker reclaimer 4, electrostatic precipitator 2, belt conveyor 25 and refrigerant 1. There are 3 rotary packaging machines, 4 forklifts, 3 lifting equipment, welding equipment and several gas cylinders.
August 20 17, factory f started the work of establishing the second-class enterprise of safety production standardization. According to relevant requirements, General Manager A of F Factory appointed the Safety and Environmental Protection Department to set up an emergency plan preparation team, with the Minister of Safety and Environmental Protection as the leader and other employees of Safety and Environmental Protection Department as the team members. 10 At the beginning of June, the emergency plan was prepared and signed by the team leader. On February 20 18, 18, the factory passed the acceptance of the second-class enterprise of safety production standardization.
At the end of April, 20 19, the factory found that there were attachments on the inner wall of the finished cement silo during the safety inspection, which had the risk of falling off and had to be cleaned up. On May 8th, C, the monitor of the maintenance class of F Factory, arranged scaffolder to set up scaffolding with a height of 16m after handling the Safety Permit for Working at Heights, and employees Ding and E climbed to clean and repair the inner wall of the finished cement silo, and on the same day.
In June, 19, 10, factory f made a maintenance plan according to the requirements of equipment and facilities in the basic specification for enterprise safety production standardization, and carried out maintenance on No.3 kiln. At 4: 03 that day, the fire stopped and the kiln stopped. 10: 37, kiln oil and coal are mixed for heat preservation. The mixed combustion of oil and coal in the kiln produces a large amount of carbon monoxide. The flue gas in the kiln enters the humidifying tower and raw meal grinding system through the preheater, and then enters the electrostatic precipitator at the end of the kiln. During maintenance, enter the electrostatic precipitator at the kiln end for maintenance.
According to the above situation, answer the following questions (***26 points)
1. Points out the problems existing in the preparation of emergency plan of F plant, and briefly describes the preparation procedure of emergency plan.
2. Briefly describe the safety requirements for cleaning and maintaining the inner wall of the finished cement silo.
3. According to the Basic Standard for Standardization of Enterprise Safety Production (GB/T33000), briefly describe the main contents that should be included in the maintenance plan of No.3 kiln in F plant.
4. According to the Classification of Casualty Accidents of Enterprise Employees (GB644 1), identify the dangerous and harmful factors existing in the maintenance process of electrostatic precipitator at the end of No.3 kiln.
5. Point out the labor protection articles that should be worn when entering the electrostatic precipitator at the end of No.3 kiln for maintenance, and explain its function.
?
Reference answer:
1. Problems in the preparation of emergency plan:
(1) The Minister of Safety and Environmental Protection is the team leader.
(2) The emergency plan shall be formulated and issued by the team leader. Compiler:
(1) Working Group on Emergency Plan Preparation;
(2) data collection;
(3) Risk assessment;
(4) emergency response capability assessment;
(5) Prepare emergency plan;
(6) emergency plan review.
2. Safety requirements after completion of aerial work:
(1) Clean up the job site, and clean up and transport the tools, dismantled objects, surplus materials and wastes used in the operation.
(2) When the scaffold is dismantled, a warning zone shall be set up and special personnel shall be assigned for monitoring. When dismantling scaffolding and protective shed, construction shall not be carried out at the same time.
(3) Temporary wires shall be removed by certified electricians.
(4) The operator should leave the site safely, and the inspector should sign the "Operation Certificate".
(5) When dismantling scaffolding, a special construction plan should be made.
3. The maintenance plan should include operation safety risk analysis, control measures, emergency treatment measures and safety acceptance standards.
4.3 Dangerous and harmful factors existing in the maintenance process of kiln tail electrostatic precipitator:
(1) Poisoning and suffocation;
(2) Other explosions;
(3) fire;
(4) electric shock;
(5) Object strike;
(6) falling from a height;
(7) Mechanical damage;
(8) Other injuries.
5. Labor protection articles worn during maintenance work and their functions:
(1) Safety helmet: to prevent injury.
(2) Dust mask: to prevent dust.
(3) Safety belt: to prevent falling from a height.
(4) air respirator: Emergency rescue.
(5) Anti-static work clothes: anti-static.
(6) Anti-static shoes: anti-static.
(7) Anti-static gloves: anti-static.
?