| 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. |
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True |
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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. |
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Non-organic or non- metal |
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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. |
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True |
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False |
| 4. |
The ease of ignition and the severity of a combustible dust explosion are never influenced by particle size. |
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True |
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False |
| 5. |
The ______________________________________ measures the minimum amount of dust dispersed in air required to spread an explosion. |
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Minimum exposable concentration |
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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. |
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True |
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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. |
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True |
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False |
| 8. |
Any combustible dust which has a Kst value lesser than zero can be subjected to dust deflagration. |
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True |
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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. |
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True |
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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. |
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True |
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False |
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