5. Which of the following is true with regard to ignition?
Answer Volatile vapors will not cause ignition if diluted below the lower explosion
limit.
6. Explosion-proof equipment is rated by both classification and .
Answer temper- ature
7. How many classification(s) of hazardous atmospheres are listed in the
NEC?
Answer Three
8. How many division(s) are there for each hazardous atmosphere classifica-
tion?
Answer Two
9. How many group(s) are listed under Class I, Division I?
Answer Four
10. Which of the following are the groups listed under Class II, Division 1?
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