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Question
22. Dust masks are frequently used improperly during hazardous welding operations.a. true
b. false
Answer
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Related questions
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b. 10 foot-candles
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b. 5 foot-candles
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13. What are the two principal ingredients of a fire prevention plan?
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10. Name at least four physical conditions that should disqualify an employee from serving in a fire brigade.
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a. They might not hear the fire alarm.
b. Excessive heat might worsen their condition.
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68. Explain the principle of "closed circuit" operation of SCBA units.
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65. Describe the situation that is known to frequently result in a series of multiple fatalities, i.e., victim, then rescuer, then rescuer of the rescuer, etc. What standard (general name only) does OSHA cite in these situations(a) prior to 1993 and (b) after 1993?
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57. Discuss in general the characteristics of confined spaces that make them hazardous.
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55. Which of the masks shown is approved for oxygen-deficiency?(a)(b)(c)none of these(d)(e)
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20. The U.S. annual fire death rate is approximately:a. one per millionb. ten per millionc. fifty per milliond. one hundred per million
Q:
19. The U.S. annual fire death rate is approximately:
a. one per million
b. eleven per million
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52. Which of the following types of supplied air respirators might explode if immersed in water?
a. pressure demand
b. sulfur dioxide reactor unit
c. chemical oxygen generating unit
d. demand flow
Q:
51. Which of the following modes of air line respirator is most dependent upon fit for its effectiveness?
a. continuous demand
b. demand flow
c. pressure demand
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Q:
47. The air line respirator derives its name froma. its use by the airlines in emergency losses of cabin pressureb. its ability to purify air in the air linec. its ability to supply atmosphere through an air lined. the fact that not only inhaled air but also exhaled air is transported through an air line
Q:
24. Because they are likely to leak, dust masks are not as popular as other respirators.a. trueb. false
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21. Dust masks are not approved for particulates.a. trueb. false
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18. A gas mask is more effective than a cartridge respirator in an oxygen-deficient atmosphere.a. trueb. false
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6. What alternative is permitted to qualify an air-purifying device to be approved for a toxic substance that has no warning properties?
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4. Explain the chemical process (name ingredients) that generates oxygen for closed circuit SCBA equipment.
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83. A common term used by safety engineers, safety managers, and emergency personnel is "bleve". Explain this term, what it means, and how the word is pronounced (what it rhymes with).
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80. A room that measures 12'x 15'x 10' has general dilution exhaust ventilation of 1 room change per hour to prevent explosion. Calculate the maximum tolerable level of gasoline vapor leaking into the room atmosphere. State any necessary assumptions. Gasoline has the following characteristics:
FLASH POINT: -40OF
BOILING POINT: 36.1OC
LEL: 1.5%
UEL: 7.8%
VAPOR DENSITY: 2.48
Q:
79. Calculate the amount of general exhaust ventilation (in room changes per hour) needed to control (prevent explosion) a general release of gasoline vapors of 4 cubic feet per minute in a room that measures 12'x 15'x 10'. State any necessary assumptions. Gasoline has the following characteristics:
FLASH POINT: -40OF
BOILING POINT: 36.1OC
LEL: 1.5%
UEL: 7.8%
VAPOR DENSITY: 2.48
Q:
75 If the temperature of a liquid is too low for a fire to be sustained on the top of the liquid, then you know thata. the temperature is below the flash point but above the firepointb. the temperature is below the firepoint but above the flash pointc. the temperature is below both the flash point and the firepointd. the temperature is below the firepointe. b and d abovef. none of the above