May'19 - Safety Online Quiz

Explanation
The statement that acceptable oxygen levels for confined space entry are 16.5% to 18.5% is false. The acceptable oxygen levels for confined space entry should be between 19.5% and 23.5%. Oxygen levels below 19.5% can cause oxygen deficiency, leading to dizziness, confusion, and loss of consciousness. Oxygen levels above 23.5% can increase the risk of fire and explosion. It is crucial to ensure that the oxygen levels in confined spaces are within the acceptable range to maintain a safe working environment.

Explanation
The statement is false because an attendant should not leave the area of the confined entry for brief periods. The role of an attendant is to monitor the entry continuously and ensure the safety of the workers inside. Leaving the area even for a short time could pose a risk as the attendant may miss any potential hazards or emergencies that may arise. Therefore, it is important for the attendant to remain present and vigilant throughout the duration of the confined entry.

Explanation
Atmospheres that contain a flammable component above 10 percent of its Lower Explosive Limit (LEL) are considered hazardous for confined space entry.

Explanation
The acronym IDLH stands for "Immediately Dangerous to Life or Health." This term is used to describe an atmosphere that poses an immediate threat to life, would cause irreversible health effects, or would impair an individual's ability to escape from a confined space. It is a critical concept in assessing the safety of confined spaces and determining the necessary precautions and protective measures to be taken.

Explanation
Confined spaces refer to areas that are enclosed or partially enclosed, with limited access and ventilation. While vessels, tanks, and vaults are commonly known as confined spaces, trenches can also be included in this category. Trenches are narrow excavations in the ground, often used for construction or utility work. They can pose significant risks, such as cave-ins, lack of oxygen, or toxic gases, making them a type of confined space. Therefore, trenches are included but not limited to confined spaces.

Explanation
Entering a permit space can prove fatal for an employee when the oxygen level is below 19.5. This is because oxygen is necessary for humans to breathe and function properly. When the oxygen level drops below 19.5%, it can lead to a condition called hypoxia, which can cause dizziness, confusion, and even loss of consciousness. In extreme cases, it can result in death. Therefore, it is crucial for employees to be aware of the oxygen levels in permit spaces to ensure their safety.

Explanation
The correct answer is [SR][SMS][020203]. This answer is correct because [SR][SMS][020203] specifically refers to the work permit for confined space work. The other options [SR][SMS][020204], [SR][SMS][020201], and [SR][SMS][020202] do not mention confined space work, so they are not the correct answer.

Explanation
The given statement defines a confined space as any area where there is a potential risk of gas, fume, vapor, or dust that could be inhaled by a person entering the space, which could lead to intoxication, suffocation, fainting, injury, or death. This definition accurately describes the characteristics of a confined space, making the answer "True" correct.

Explanation
The man-hole dimensions stated in option (a) and (b) meet the statutory requirements. For rectangular or oval shape man-holes, the minimum size required is the shoulder width + 8 cm in length and 30 cm wide. For circular shape man-holes, the minimum size required is the shoulder width + 8 cm in diameter. Option (b) specifies that for oval shape man-holes, the minimum size required is 40.6 cm in length and 30.5 cm wide, and for circular shape man-holes, the minimum size required is 40.6 cm. Since both options meet the specified requirements, the answer is True.

Explanation
The portable hand lamp is flame proof, meaning it is designed to prevent the ignition of flammable gases or vapors in the confined space. Additionally, it operates on a 24-volt supply, which reduces the risk of electrical hazards. Therefore, it is safe to use the lamp inside the confined space.