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Hazard Communication Guidance for Combustible Dusts


Quiz Questions

1. Combustible dust is defined as a solid material composed of distinct particles or pieces, regardless of size, shape, or chemical composition, which presents a fire or deflagration hazard when suspended in air or some other oxidizing medium over a range of concentrations.
True
False
2. Combustible dusts are often either ________________________ dusts that are finely ground into very small particles, fibers, fines, chips, chunks, flakes, or a small mixture of these.
Non-organic or non- metal
Organic or metal
3. Combustible dust, ignition source, oxygen in air, dispersion of dust particles in sufficient quantity and concentration and confinement of the dust cloud are necessary to initiate a dust explosion, often referred to as the dust explosion pentagonn.
True
False
4. The ease of ignition and the severity of a combustible dust explosion are never influenced by particle size.
True
False
5. The ______________________________________ measures the minimum amount of dust dispersed in air required to spread an explosion.
Minimum exposable concentration
Minimum ignition energy
6. The dust deflagration index Kst measures the relative explosion severity compared to other dusts. The larger the value for Kst, the more severe is the explosion.
True
False
7. Different dusts of the same chemical material can have different ignitability and explosibility characteristics, depending upon physical characteristics such as particle size, shape, and moisture content.
True
False
8. Any combustible dust which has a Kst value lesser than zero can be subjected to dust deflagration.
True
False
9. The HCS requires employers to inform workers about the general requirements of the standard, operations where hazardous chemicals are present and the location of the written HCS program.
True
False
10. The first two components of the HCS (evaluation of hazards and provision of hazard information via labels and MSDSs) provide the foundation for the worker training.
True
False
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