PROPANE - FINAL EXAM

NAME: ____________________________ DEALERSHIP: ______________________ This is a timed, multiple choice end-of-unit examination, designed to demonstrate your understanding of the information presented. Circle the answer most nearly correct. You will have 60 minutes to complete the examination. Follow other directions as given by the test proctor. 1. L.P. gas can be refined from:

a. kerosene b. gasoline c. crude oil d. methanol

2. The basic building block of L.P. gas is:

a. hydrocarbon b. carbohydrate c. hydrogen sulfate d. hydroxide

3. L.P. gas in it’s natural state is:

a. clear, smelling of sulphur b. odorless and yellow c. colorless and odorless d. colorless, smelling of “skunk oil”

4. The specific gravity of liquid propane in relation to water is approximately:

a. 2.0 b. 1.5 c. 1.0 d. .50

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5. The specific gravity of L.P. gas in relation to air is approximately:

a. 0.5 b. 1.0 c. 1.5 d. 2.0

6. The flammability limits of propane are:

a. 1.55 – 8.6% b. 2.01 – 4.84% c. 8.6 – 36.4% d. 2.15 − 9.6%

7. The odorant most used in L.P. gas is:

a. hydrogen sulfide b. ethyl mercaptan c. methyl acetone d. ethyl glycol

8. The chemical formula of propane is:

a. C3H8 b. H2S04 c. methyl acetone d. Ethyl glycol

9. Propane weighs _____ lbs. Per gallon:

a. 2.2 b. 3.85 c. 4.2 d. 4.89

10. L.P. gas ignites at approximately:

a. 1150 – 3615 degrees F b. 900 – 1100 degrees F c. 120 – 180 degrees C d. 900 – 1100 degrees C

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11. Propane boils at:

a. − 44 degrees F b. – 32 degrees F c. 0 degrees F d. 32 degrees F

12. Liquid propane expands at the rate of ________% for each _______ rise in

temperature:

a. 1.5% for each 10 degrees C b. 20% for each 10 degrees F c. 1.5% for each 10 degrees F d. 10% for each 20 degrees C

13. One gallon of propane will produce approximately ________ BTU:

a. 2,516 b. 10,277 c. 21,591 d. 91,500

14. Using you answer to question 12, what would be the volume percentage in a tank

originally filled 50% full after increasing it’s temperature by 50 degrees F (approximately 30 degrees C)?

a. 35% b. 57.5% c. 100% d. 72.5%

15. “DOT” stands for:

a. Distributor of Tanks b. Department of Transportation c. Distance of Transfer d. Drop Oil Test

16. “ASME” stands for:

a. American Steel Manufacturers Equipment b. American Society of Manufacturing Engineers c. Actual Service Measuring Equipment d. American Society of Mechanical Engineers

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17. The pressure inside a container is referred to as:

a. full bottle pressure b. operation pressure c. system pressure d. storage pressure

18. A device designed to close when the liquid or vapor passing through it exceed a

prescribed flow rate is known as:

a. maximum liquid level shutoff b. a system relief c. an excess flow check valve d. a purge connector

19. “POL” stands for:

a. Pressure Over Load b. Put On Left c. Purge Overfilled Liquid d. Prest-O-Lite

20. Water column is a unit of measure used to express:

a. weight b. pressure c. volume d. capacity

21. “BTU” stands for:

a. British Thermal Unit b. British Transfer Unit c. Before Tank Union d. Below Thermal Union

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USING THE DRAWING BELOW, IDENTIFY THE FOLLOWING COMPONENTS: (QUESTIONS 22 – 25)

22. Safety relief valve: a. 2 b. 3 c. 4 d. 5

23. POL:

a. 1 b. 2 c. 3 d. 4

24. Vapor withdrawal tube:

a. 1 b. 2 c. 3 d. 4

25. Fixed liquid level gauge:

a. 2 b. 3 c. 4 d. 5

26. The “high side” of a system includes the:

a. tanks, components, connectors b. orifice c. appliances d. vertical covers

27. A problem caused when odorant is not detectable is called:

a. safety loss b. odorant fade c. carbon failure d. olfactory fatigue

28. The marking “TW” on the collar of a DOT tank stands for:

a. tank weight b. toward water c. tare weight d. transfer working

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29. New tanks are shipped with air inserted. The reasons for this include:

a. preventing rust, allowing testing, and valve lubrication. b. a safety clue, desiccation, and testing. c. preventing rust, a safety clue, and testing. d. allows testing, moisture absorption, and preventing rust.

30. New tanks are usually filled with:

a. air and alcohol mixture b. dehydrated air c. moisturized air d. air/methane mixture

31. A new tank not properly purged will likely cause:

a. false container pressure b. low energy filling c. pilot overburn d. rapid transfer

32. During purging, the air is released from a new tank. When the valve is opened and

all air is released, the pressure in the tank will be:

a. – 44 psi b. 0 psi c. 14.7 psi d. 22.8 psi

33. When purging a tank you should be at least _____ fet from any source of ignition:

a. 65 b. 50 c. 25 d. 15

34. When purging a tank the gas should be:

a. neutralized b. burned off with a torch c. vented to the atmosphere d. burned off at the range

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35. Leak testing a container should ideally be done with:

a. liquid soap such as Pine-Sol b. an electronic leak detector c. water submergence d. litmus paper

36. An examination of the tank should include visual inspection of the:

a. dip tube b. oil level c. welds d. head thickness

37. Tanks must be re-certified __________ years after manufacture:

a. 15 b. 12 c. 10 d. 5

38. Using the following table, determine the maximum allowable dent depth of a dent 2

3/16 inches in diameter:

a. 0.22” b. 0.23” c. 0.24” d. 0.25”

39. A “condemned” cylinder must be:

a. rebuilt b. re-heat-treated c. repaired d. scrapped

40. Tanks and cylinders may be filled to ______% of capacity:

a. 95 b. 80 c. 70 d. 42

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Table 1 – Maximum Allowable Dent Depth

Average Maximum Average Maximum Average Maximum Dent Allowable Dent Allowable Dent Allowable

Diameter Dent Depth Diameter Dent Depth Diameter Dent Depth Inches Inches Inches Inches Inches Inches

0.5 0.05 4.5 0.45 8.5 0.85

0.375 0.06 4.38 0.46 8.125 0.86 0.25 0.07 4.25 0.47 8.25 0.87 0.875 0.09 4.875 0.49 8.875 0.89

1 0.10 5 0.50 9 0.90

1.125 0.11 5.125 0.51 9.125 0.91 1.25 0.12 5.25 0.52 9.25 0.92 1.375 0.14 5.375 0.54 9.375 0.94

1.5 0.15 5.5 0.55 9.5 0.95

1.375 0.16 5.375 0.56 9.375 0.96 1.25 0.17 5.25 0.57 9.25 0.97 1.875 0.19 5.875 0.59 9.875 0.99

2 0.20 6 0.60 10 1.00

2.125 0.21 6.125 0.61 10.125 1.01 2.25 0.22 6.25 0.62 10.25 1.02 2.375 0.24 6.375 0.64 10.375 1.04

2 1 /2 0.25 6.5 0.65 10.5 1.05 2.375 0.26 6.375 0.66 10.375 1.06 2.25 0.27 6.25 0.67 10.25 1.07 2.875 0.29 6.875 0.69 10.875 1.09

3 0.30 7 0.70 11 1.10

3.125 0.31 7.125 0.71 11.125 1.11 3.25 0.32 7.25 0.72 11.25 1.12 3.375 0.34 7.375 0.74 11.875 1.14

3.5 0.35 7.5 0.75 11.2 1.15

3.375 0.36 7.375 0.76 11.375 1.16 3.25 0.37 7.25 0.77 11.25 1.17 3.875 0.39 7.875 0.79 11.375 1.19

4 0.40 8 0.80 12 1.20

4.125 0.41 8.125 0.81 12.125 1.21 4.25 0.42 8.25 0.82 12.25 1.22 4.375 0.44 8.375 0.84 12.375 1.24

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41. With the outage valve open, ____________ will show when the proper level of liquid in the tank has been exceeded.

a. white liquid b. odorant vapor c. water d. ice

42. Before filling a DOT tank for the first time, it should be identified by affixing a label

stating:

a. “Propane” b. “Danger” c. “Flammable Gas” d. “Liquid Gas”

43. DOT cylinders should have _____ before being transported.

a. new paint b. a regulator gauge c. the presence of vapor d. a POL plug or cap

44. An inoperative relief valve must be:

a. repaired b. replaced c. re-certified d. reseated

45. The relief valve on a DOT tank is set for _______ lbs.

a. 312 b. 350 c. 375 d. 400

46. The relief valve on an ASME tank for vapor withdrawal is set for:

a. 299 b. 312 c. 375 d. 400

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47. A remote-reading gauge operates at ______ ohms resistance.

a. 1 – 90 b. 0 – 100 c. 1 – 100 d. 0 –90

48. On a remote sender, an open circuit will cause the receiver to read:

a. not at all b. empty c. full d. half full

49. Since 1983 it has been a regulation that each ASME tank be equipped with:

a. a float gauge b. an automatic stop-fill valve c. a grounding tab d. a welded cylinder

50. A defective automatic stop-fill valve may be replaced with:

a. another automatic stop-fill valve b. an annual service valve c. any type of fill valve d. a new float

USING THE FOLLOWING DIAGRAM, IDENTIFY THE FOLLOWING COMPONENTS:

51. Vent stem:

a. 2 b. 3 c. 4 d. 5

52. Shutoff valve:

a. 1 b. 2 c. 3 d. 4

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53. Pressure relief:

a. 6 b. 3 c. 4 d. 5

54. Outage valve:

a. 1 b. 2 c. 3 d. 4

USING THE FOLLOWING DIAGRAM, IDENTIFY THE FOLLOWING COMPONENTS:

55. Diaphragm:

a. 1 b. 2 c. 5 d. 7

56. Relief mechanism:

a. 1 b. 3 c. 4 d. 5

57. Seat:

a. 2 b. 4 c. 6 d. 7

58. A defective regulator:

a. must be returned for service b. may be repaired with a kit c. must be replaced d. may be tested

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59. When conducting an operating test, gas must be:

a. static b. turned off c. shunted to the regulator d. flowing through the regulator

60. To raise the outlet pressure of a regulator you must:

a. reduce the demand b. turn the adjusting screw “in” c. bypass the relief d. turn the adjusting screw “out”

61. “Demand” on a system, for purposes of setting a regulator, is approximately

__________% of the total requirement of the system.

a. 40 b. 50 c. 60 d. 70

62. The vent on a regulator must be mounted:

a. within 45 degrees of vertical (down) b. horizontally c. within 45 degrees of vertical (up) d. below the level of the tank

63. Liquid L.P. in a regulator will cause:

a. a yellow flame b. fluctuating manometer pressure c. ice at the vent d. the excess flow valve to activate

64. A plugged vent can cause:

a. seat damage b. tank overfill c. a cracked cover d. fluctuating manometer pressure

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65. A leak around the crimped diaphragm cover edge of the regulator indicates:

a. second stage over pressure b. foreign material in the inlet c. an overfilled tank d. vent plugging

66. A “lock-up” test is used to determine:

a. if the excess flow check is damaged b. the condition of the pigtails c. the integrity of the diaphragm d. correct regulator pressure

67. A “drop-pressure” test must show no pressure loss for ________ minutes.

a. 3 b. 5 c. 8 d. 12

68. Nominal operating pressure of an RV gas system should be:

a. 1 psi b. .5” W.C. c. 15” W.C. d. 11” W.C.

69. On a travel trailer the relief valve should:

a. face away from the trailer b. be set at 125 psi c. be covered d. face the trailer

70. Maximum “lock-up” pressure must never exceed:

a. 14” W.C. b. tank pressure c. ½ psi d. 11” W.C.

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71. The first stage of two-stage regulation will reduce tank pressure to approximately:

a. 5 – 8 psi b. 30” W.C. c. 10 – 13 psi d. 11” W.C.

72. During an operating test of the L.P. regulator the pressure drops 6” when a

demand is placed on the system. This does NOT indicate:

a. a defective regulator b. an obstruction in the system c. a blockage in first stage regulation d. a faulty dip tube in the tank

73. When attempting to solve a propane system problem, you will need a:

a. timing limit b. volt ohmmeter c. manometer d. “Rosan” leak detector

74. Low gas pressure and proper combustion air during the combustion-cycle can

cause combustion:

a. above the burner b. behind the burner c. every time d. only when the burner is out of the heat chamber

75. A quick disconnect is allowed to be used inside the coach if:

a. listed for RV use b. a shut-off valve is installed before the connector c. it is made of brass d. it has a minimum cross sectional area equivalent to 50 square inches.