ch 7.txt

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hispeeddev
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ch 7.txt
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2013-03-31 03:39:01
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ch 7
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  1. Portable fire extinguishers should be considered -
    As a primary means of extinguishing incipient fires.
  2. Backpack pump tank water extinguishers usually have a maximum capacity of -
    5 gallons of water
  3. What is the principle agent of a Wet Chemical fire extinguisher?
    Potassium acetate
  4. The primary mode in which Water extinguishes a fire is through -
    Cooling
  5. What is meant by 'Saponification'?
    The fire is extinguished by forming an oxygen-excluding soapy foam.
  6. What is meant by 'smothering' a fire?
    The fire is extinguished by oxygen exclusion
  7. What is meant by cooling a fire?
    The fire is extinguished by reducing the burning material below its ignition temperature.
  8. The primary mode in which Foam extinguishes a fire is through -
    Oxygen depletion.
  9. The primary mode in which Dry Chemical extinguishes a fire is through -
    Chain inhibition
  10. The primary mode in which Wet Chemical extinguishes a fire is through -
    Oxygen depletion
  11. The primary mode in which Dry Powder extinguishes a fire is through -
    Oxygen depletion
  12. The primary mode in which Carbon Dioxide extinguishes a fire is through -
    Oxygen depletion
  13. The primary mode in which Clean Agent extinguishes a fire is through -
    Chain inhibition
  14. The secondary mode in which Foam extinguishes a fire is through -
    Vapor suppression.
  15. The secondary mode in which Water extinguishes a fire is through -
    Oxygen depletion
  16. The secondary mode in which Dry Chemical extinguishes a fire is through -
    Oxygen depletion
  17. Fires that involve flammable and combustible liquids are classified as -
    Class B
  18. Fires that involve ordinary combustibles such as textiles, paper, plastic, rubber and wood are classified as -
    Class A
  19. Fires that involve combustible oils are classified as -
    Class K
  20. Fires that involve combustible metals are classified as -
    Class D.
  21. __ fires are Class A or Class B fires created by electrical energy.
    Class C
  22. The first step in extinguishing a Class C fire is to -
    Disconnect the power to whatever is burning.
  23. Pump-Type water extinguishers are applicable to which class of fire?
    Class A
  24. Under normal conditions Stored-Pressure water extinguishers can obtain a fire stream of -
    30 - 40 feet
  25. Wet Chemical fire extinguishers should only be use on which of the following classes of fire?
    Class K
  26. Carbon dioxide fire extinguishers can be used on which of the following classes of fire?
    Class B and C
  27. Stored -pressure water extinguishers are normally compressed with which of the following gases?
    Air Nitrogen
  28. What is the main purpose of adding Class A foam to water extinguishers?
    The foam serves as a wetting agent for extinguishing deep-seated fires
  29. Dry Powder extinguishers are used to extinguish which types of fires?
    Combustible metal fires
  30. Which of the following types of water extinguishers are safe to use on energized electrical equipment?
    Water-Mist Stored-Pressure extinguishers with deionized water
  31. You are responding to MCDONALDs where the deep frier oil cooking the french fries as burst into flames. Which of the following extinguisher would you use to extinguish this fire?
    West Chemical Stored-Pressure extinguisher
  32. Which of the following extinguishers is particularly useful in combating fires in or suppressing vapors from small liquid fuel spills?
    Aqueous Film Forming Foam (AFFF) extinguishers.
  33. When AFFF and water are mixed together, the resulting foam mixture -
    Is lighter than water
  34. Which of the following liquids is AFFF effective on?
    Gasoline
  35. AFFF extinguishers are not effective on which of the following classes of fire?
    Class C and D.
  36. Which of the following extinguishers were designed specifically as replacements for Halon 1211?
    Clean Agent extinguishers
  37. Carbon Dioxide extinguishers are effective in extinguishing which of the following classes of fire?
    Class B and C only
  38. CO2 fire extinguishers should be protected from freezing if they are expose to temperatures below -
    CO2 extinguishers do not require and special freeze protection.
  39. The reach of a Carbon Dioxide extinguisher is -
    3 to 8 feet
  40. One hazard in using CO2 extinguishers is -
    Contact with the discharge horn may cause electrical shock
  41. Which portable extinguisher is the most common portable fire extinguisher in use today?
    Dry chemical extinguishers
  42. Multipurpose dried chemical extinguishers are rated for which class of fire?
    Class A, B or C.
  43. Which type of portable fire extinguisher has the characteristic 'horn' nozzle?
    CO2 extinguishers
  44. What is the effective reach of a Halon 1301 extinguisher?
    4 to 6 feet
  45. Which of the following extinguishers has a nearly invisible gaseous stream?
    Halon 1301
  46. The stream reach of a dry chemical extinguisher under normal conditions is -
    5 to 20 feet.
  47. Normal discharge time for a hand-carried dry chemical extinguisher is -
    8 - 25 seconds
  48. Halon 1211 extinguishers are primarily designed for which of the following class of fire?
    Both Class B and C.
  49. Which compound would you NOT expect to find in dry chemical extinguishers?
    Potassium chlorate
  50. Care against freezing should be given to dry chemical extinguishers if they are exposed to temperatures below -
    Because the material is dry chemical, no special care is needed.
  51. When using a dry chemical extinguisher, the best results are obtained by attacking the
    Base of the fire
  52. A Class D fire extinguisher is used to extinguish which type of fire?
    Metal fires.
  53. You are called to an alarm at an old boarding school, and notice that there are soda-acid extinguishers in the corners of the stairwells. What should you do?
    Inform the school authorities that these extinguishers are obsolete and must be replaced at once.
  54. Which of the following is NOT part of every fire extinguisher inspection?
    Discharge a small amount of the extinguisher's contents to ensure that the unit is working properly.
  55. When inspecting fire extinguishers, if an extinguisher is found to be deficient in weight by __ it should be removed from service and replaced.
    10%
  56. Underwriter's laboratories has assigned a numerical rating system for Class A water fire extinguishers based on the extinguisher's -
    Amount of extinguishing agent and the duration and range of the discharge. 
  57. Class A fire extinguishers have a UL numerical rating from 1 to -
    40
  58. What is the UL numerical rating for Class B fire extinguishers based on?
    The approximate square foot area of a flammable liquid fire that a nonexpert operator can extinguish
  59. UL numerical ratings for Class B fire extinguishers run from 1-B to -
    640-B
  60. What is the UL numerical rating range for Class C fire extinguishers?
    Class C fire extinguishers have no such ratings.
  61. Some extinguishers are suitable for more than one class of fire. These extinguishers are marked in which of the following manners?
    The extinguishers are identified by multiples of the symbols A, B, and or C
  62. Selecting the proper portable fire extinguisher depends on which of the following factors?
    All the above.
  63. Which of the following obsolete extinguishers is designed to be turned upside-down in order to operate?
    All the above.
  64. The most effective way to extinguish a fire with a portable extinguisher is to direct the extinguishing agent -
    Back and forth at the base of the flames
  65. A quick way to remember the steps in the operation of portable fire extinguishers is the -
    PASS method
  66. When using a portable extinguisher on a fire, the firefighter should always __ before approaching the fire.
    Discharge a short test burst to ensure proper operation.
  67. Backpack extinguishers are recommended in all of the following circumstances except -
    As an effective aid to extinguishing Class K fires.
  68. NFPA 10 requires that Stored-Pressure water extinguishers should be protected against freezing if they are going to be exposed to temperatures less than -
    40 degrees F
  69. Which of the following statements regarding Dry Powder extinguishers is true?
    Dry Powder extinguishers are for Class D fires only.
  70. Class A foam concentrate is sometimes added to a water extinguisher to increase effectiveness of extinguishing deep-seated fires, vehicle fires, and wildland fires. What is the main effect of the Class A foam.
    The foam serves as a wetting agent.
  71. Which of the following extinguishers are capable of creating a blanket of foam?
    AFFF extinguishers.
  72. One of the main fears in using a CO2 extinguisher on flammable liquids is that the -
    CO2 does not form any vapor-suppressing film, so reignition can pose a danger.
  73. 84) A common-sized extinguisher, such as a multipurpose extinguisher rated 4-A, 20 B:C should be able to extinguish a Class A fire which is __ times larger than a 1-A fire, and also be able to extinguish approximately __ times as much Class B fire as a 1-B extinguisher.
    4, 20. 
  74. The labelling system recommended by NFPA 10 is the use of -
    A) Pictographs representing Class A, Class B, and Class C fires to make the selection of the appropriate extinguisher.
  75. Firefighters using portable extinguishers should approach the fire from the -
    Windward side of the fire. 
  76. Portable extinguishers that have been used should -
    Be laid on their sides to signal that the extinguisher is empty.
  77. All portable fire extinguishers expel their contents by one of the following methods except -
    Electrostatic charge.
  78. Wheeled dry chemical extinguishers are rated for all but which class of fire?
    Class D.
  79. All of the following are factors that determine the value of a fire extinguisher except -
    Its UL rating. 
  80. Any fire extinguisher that shows any sign of damage or corrosion should be -
    C) Hydrostatically tested. 

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