Deck 11: Flammable and Explosive Materials

Question 1

17.All combustible liquids are Class II liquids.

Answer 1

False

Question 2

13.Classification of flammable liquids does not depend upon boiling point.

Answer 2

False

Question 3

21.Class III B liquids are not classified by OSHA standards as "hazardous substances."

Answer 3

True

Question 4

7.Which of the following is best classified as a Class B explosive?

A)nitroglycerin
B)dynamite
C)black powder
D)propellant

Question 5

16.All Class I liquids are flammable liquids.

Question 6

22.The ignition temperature for gasoline is higher than for paper.

Question 7

3.What two physical characteristics of a liquid are principally used to determine its flammability classification?

A)flashpoint and boiling point
B)flashpoint and firepoint
C)boiling point and firepoint
D)volatility and boiling point

Question 8

9.Which of the following is best classified as a Class C explosive?

A)black powder
B)propellant
C)photographic flash powder
D)explosive rivets

Question 9

15.All flammable liquids are Class I liquids.

Question 10

8.Which of the following is best classified as a Class A explosive?

A)black powder
B)propellant
C)photographic flash powder
D)explosive rivets

Question 11

20.Some flammable liquids are Class III liquids.

Question 12

4.What principal physical characteristic of gasoline makes it particularly hazardous to have basements in service stations?

Question 13

11.The definition of "liquid" by NFPA as far as flammable liquids are concerned has little to do with vapor pressure.

Question 14

12.Flashpoint is the temperature at which a fire on top of the liquid is sustained.

Question 15

18.All combustible liquids are Class III liquids.

Question 16

5.What is the principal criterion for determining whether wiring for flammable paint spray areas must be Class I Division 1 or Division 2?

Question 17

6.The proper wiring selection for areas twenty feet or more away from flammable paint spray booths is:

A)Class I,Division 1
B)Class I,Division 2
C)Class II,Division 1
D)conventional wiring

Question 18

19.All Class II liquids are combustible liquids.

Question 19

1.What two physical characteristics of a liquid are principally used to determine its flammability classification?

Question 20

14.Volatility of a liquid bears a close relationship to the boiling point of a liquid.

Question 21

23.An empty tank can be more dangerous than a tank full of gasoline.

Question 22

39.Use of a carbon dioxide fire extinguisher can subject the user to electrical shock.

Question 23

31.Gasoline vapors are lighter than air and will th

Question 24

33.High octane aviation gasoline is more flammable than ordinary "regular" gasoline.

Question 25

37.When dispensing Class I liquids into plastic containers,NFPA regulations require electrical bonding.

Question 26

27.Alcohol will ignite inside a drum more readily than gasoline will.

Question 27

25.Gasoline will ignite at leaner concentrations than alcohol will.

Question 28

34.A broken light bulb can ignite vapors of flammable liquids.

Question 29

40."Splash loading" generates static electricity.

Question 30

30.If space permits,the safest place to locate tanks of gasoline is outside in overhead tanks.

Question 31

29.Underground tanks of gasoline will not sustain combustion.

Question 32

38.Filling tanks or containers generates static electricity due to the flow of the liquid.

Question 33

42.Static electrical discharge is a source of ignition for flammable liquid vapors.

Question 34

35.Flammable liquid tank design is an engineering function and is th

Question 35

28.Fires in underground gasoline tanks burn or explode with such intensity as to destroy much life and property around service stations.

Question 36

36.Floating roof tanks are more hazardous than fixed roof tanks.

Question 37

24.Gasoline/air mixtures in which the gasoline vapors are held to less than 5% are considered safe.

Question 38

26.Alcohol will ignite at richer concentrations than gasoline will.

Question 39

41.A "rest area" expansion chamber in a liquid flow line permits static electricity to bleed off.

Question 40

32.Natural gas is lighter than air and will th

Question 41

53.Quick action with the proper fire extinguisher is the key to control of burning LPG.

Question 42

62.Label the axes in the diagram.

Question 43

54.Which of the following is not considered a flammable liquid?

A)acetone
B)gasoline
C)propane
D)carbon disulfide

Question 44

46.Automatic sprinkling systems are required in paint spray areas.

Question 45

48.Combustible residues contribute to the largest proportion of spray booth fires.

Question 46

56.The principal basis for classification of flammable liquids is:

A)flashpoint
B)firepoint
C)volatility
D)autoignition temperature

Question 47

59.Which of the following is used to extinguish LPG fires?

A)dry chemical portable fire extinguishers
B)water
C)CO₂
D)BLEVE units

Question 48

50.Pure propane has a characteristic odor.

Question 49

44.Electrical wiring inside spray booths,subject to deposits of combustible residue,must be in rigid conduit or in boxes or fittings containing no taps,splices,or terminal connections.

Question 50

47.If a sprinkler system is installed inside ventilation ducts for a spray area,sprinkler heads are needed on both sides of the filter system.

Question 51

52.LPG tanks are required to have "bleed off" valves for removing condensed moisture.

Question 52

61.The diagram plots

A)flammability vs.combustibility
B)flash points vs.boiling points
C)liquids vs.vapors
D)class vs.division

Question 53

60.Label the temperatures (Fahrenheit)on the axes.

Question 54

49.Spray residue accumulations are difficult to detect and thus do not lead to many OSHA citations.

Question 55

51.Injury from liquid propane while opening the tank valve implies that the valve is defective.

Question 56

58.The most frequently used test for flashpoint is the

A)Cleveland open cup test
B)TAG closed tester
C)Pensky-Martens closed tester method
D)BLEVE test

Question 57

45.Electrical equipment of any kind is prohibited in a spray area if subject to deposits of combustible residues.

Question 58

57.The "TAG closed tester" derives its name from

A)the tag indicator device which is suspended in the liquid
B)the term "TEST AND GROUND"
C)the term "TEMPERATURE ABSOLUTE GAUGE"
D)an abbreviation of a French name

Question 59

55."Liquids" excluded by NFPA from the definition of "flammable liquid" are those which have a vapor pressure:

A)less than 40 pounds
B)more than 40 pounds
C)less than 100 pounds
D)more than 100 pounds

Question 60

43.Small portable spraying apparatus not used repeatedly in the same location is exempt from spray painting standards.

Question 61

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).

Question 62

72.Define the term "flash point".

Question 63

69.What term describing liquid

Question 64

84.Transportation of a new explosive requires prior approval and the assignment of:

A)a flashpoint
B)an emergency fire procedure
C)an EX-number
D)a CAS number

Question 65

65.The design concept illustrated in the diagram on the left is.

Question 66

77.In qualitative terms describe the relationship between flash point and flammability and combustibility.

Question 67

67.The concentration of flammable vapors in the air that is sufficiently rich to ignite describes which of the following terms?
a.flash point
b.boiling point
c.LEL
d.UEL

Question 68

81.A glue-making process releases ethylene glycol that becomes generally diluted and interspersed throughout the plant atmosphere.The rate of release is 2.4 cubic feet per hour vapor volume at standard plant temperature and pressure.The plant ventilation system is of the general dilution type with make-up air being supplied at windows and doors throughout the plant area.The plant area is 4000 square feet and the average ceiling height is 12 feet.The problem is to specify the capacity of the general ventilation system required to maintain a steady state condition throughout this process area that protects against both health and safety hazards due to ethylene glycol.For your information in performing calculations the following data is provided:
ETHYLENE GLYCOL (CH₂OHCH₂OH)
Molecular weight: 62.1
Boiling point: 197.5^o Celsius
LEL: 3.2%
Firepoint: -13^o Celsius
Flash point: 232^o Fahrenheit
Autoignition temperature: 752^o Fahrenheit
Vapor Pressure: 0.05 mm @ 20^o Celsius
PEL: 50 ppm (Ceiling)
(a)Calculate how much exhaust ventilation (in cubic feet per hour,general dilution type)is required to maintain safety hazards below explosive levels.Show your work.

Question 69

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: -40^OF
BOILING POINT: 36.1^OC
LEL: 1.5%
UEL: 7.8%
VAPOR DENSITY: 2.48

Question 70

71.What term describing flammable liquids

Question 71

74 The temperature above which a flammable liquid gives off vapors too rich ignite is called
a.firepoint
b.flash point
c.LEL
d.UEL
e.none of the above

Question 72

68.What term describing flammable liquids

Question 73

63.Which of the following characteristics is indicated by the diagram?

A)flash point
B)boiling point
C)UEL
D)none of the above

Question 74

82.Under certain conditions,combustible liquids become as easily ignitable as flammable liquids at room temperature.Explain these conditions and how they relate to flashpoint.

Question 75

64.Which of the following parameters of flammable liquids is shown on the diagram?

A)flash point
B)boiling point
C)LEL
D)none of the above

Question 76

4/v_s = 3.2% = 0.032
v_s = 2.4/0.032 = 160 ft³/hr
(b)Calculate how much exhaust ventilation (in cubic feet per hour,general dilution type)is required to maintain health hazards below OSHA-specified Action Levels (AL).Show your work.

Question 77

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: -40^OF
BOILING POINT: 36.1^OC
LEL: 1.5%
UEL: 7.8%
VAPOR DENSITY: 2.48

Question 78

70.What term describing flammable liquids

Question 79

78.Which of the following characteristics is indicated by the diagram?
a.flash point
b.boiling point
c.LEL
d.none of the above

Question 80

4/v_h = 50 ppm = 0.000050
v_h = 2.4/0.000050 = 48000 ft³/hr
(see continuation on next page)
(c)Calculate how many plant area room changes per hour the level of ventilation calculated in part (b)would represent.Show your work.