Accident case analysis: one question per Monday (20). +3 wealth for participation, plus an additional 1–14 wealth for correct answers

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This post was last edited by wang*nhua77020 on 2016-9-19 at 12:31. Mobile conveyors are used to transport materials in the wood processing workshop of B Furniture Factory. The drive motor of the movable conveyor is powered by a 380V three-core cable, and the cable at the entrance of its iron control box is secured with cloth strips. Since the control box moves frequently along with the conveyor belt, the operator installed only one bolt for fixation for convenience. The control box does not have a leakage protection device. 　　The dust concentration in the wood processing workshop remains above the standard throughout the year. At 15:20 on May 21, 2009, due to the accumulation of wood in the workshop which affected the proper operation of the conveyor belt, the on-site operators moved the conveyor belt while it was still under power without taking any protective measures. During movement, the three-core cable became loose and detached, causing the live cable to come into contact with the control box housing, which resulted in one employee being electrocuted. In a panic, the on-site staff pulled on the three-core cable without turning off the power supply, which caused a short circuit and sparking, leading to a dust explosion. 　　The accident resulted in 2 deaths on the spot and 1 person suffering serious injuries. The seriously injured person died despite 34 days of treatment. The accident caused partial collapse of the building in the wood processing workshop, leading to the suspension of operations throughout the factory; the direct economic loss amounted to over 8 million yuan. 　　Based on the above scenario: Answer the following questions (multiple-choice). Please hide your replies; thank you.
1. The direct economic losses resulting from this accident do not include (　　)
A. Medical expenses
B. Losses due to suspension of business operations
C. Fines imposed as a result of the accident
D. Costs associated with cleaning up the accident site
E. Expenses for funerals and compensation

2. According to the “Regulations on the Reporting, Investigation, and Handling of Production Safety Accidents” (State Council Order No. 493), this accident falls under (　　)
A. Minor accident
B. Moderate accident
C. Severe accident
D. Major accident
E. Extremely serious accident

3. This accident revealed the following problems in Factory B’s daily safety management: (　　)
A. Inadequate safety training
B. Insufficient safety inspections
C. Substandard personal protective equipment
D. Failure to use explosion-proof motors
E. Incomplete job responsibility systems

4. Which of the following measures can effectively address the issue of excessive dust levels in the wood processing workshop? (　　)
A. Enclosing dust-generating equipment
B. Dust inerting measures
C. Dust removal and purification techniques
D. Ventilation systems for purification
E. Anti-static measures

5. Which technical measures can be used to prevent electric shock among workers when using moving conveyor belts? (　　)
A. Installing leakage protection devices
B. Using electromagnetic shielding
C. Adopting the TT system
D. Installing mechanical interlocks
E. Using a protective zero-grounding system

6. Regarding the risk of dust explosions at Factory B, which of the following statements is correct? (　　)
A. The higher the dispersion of dust, the more likely an explosion is to occur.
B. The higher the dust concentration, the greater the risk of explosion.
C. The higher the oxygen content, the greater the intensity of the explosion.
D. The higher the temperature of the dust, the greater the risk of explosion.
E. The higher the humidity of the dust, the greater the risk of explosion.

7. The principles that should be adhered to in the investigation and handling of accidents include: (　　)
A. Prioritizing the protection of migrant workers’ rights
B. The principle of “not letting go until all aspects are addressed”
C. Principles of fairness and transparency
D. Giving priority to the interests of the enterprise
E. Seeking truth from facts and respecting science

Answers: 1. B 2. A 3. ABE 4. ACD 5. ACE 6. ABCD 7. BCE