51. Mine rescue SCBA’s will be inspected and tested at intervals not exceeding 30 days.

52. Atmospheric pressure and temperature are important factors because they:

53. The traverse method is used when:

54. The preferred type of extinguisher for teams is a dry chemical type that contains:

55. Burning materials that give off extremely toxic gases in addition to carbon monoxide are:

56. The three preconditions for opening a sealed fire area are; low oxygen, no carbon monoxide, sufficiently cooled conditions.

57. An elevated concentration of carbon dioxide in mine air can be harmful because:

58. Oxides of nitrogen can occur in a mine atmosphere:

59. Carbon Dioxide is a heavier gas and will diffuse rapidly.

60. After Damp is: