Question 9008 of 731 · Texas Journeyman Electrician Exam
Hydrogen belongs to which Class I material group?
Exactly one answer is correct.
You got of questions right. Here on the question pages nobody remembers which ones you got wrong. The trainer saves your progress and asks the mistakes again until they stick.
Or free: the 10 questions most people get wrong
Show solution
Correct answer to question 9008
- C: Group B
Explanation
Hydrogen and similar highly volatile gases fall into Group B. Acetylene alone forms Group A, ethylene is typical of Group C, and propane or gasoline are typical of Group D.
More questions: Special Occupancies
- 9009An atmosphere containing combustible magnesium or aluminum dust is assigned to which Class II group?
- 9010A grain elevator handling flour and grain dust is classified as Class II, Group ____.
- 9016Which wiring method is generally permitted in a Class I, Division 1 location?
- 9018Enclosures for equipment in a Class II, Division 1 location must generally be of what type?
- 9019What is the basic design principle of explosionproof equipment?
- 9020Intrinsically safe systems covered by Article 504 rely on which protection principle?