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Bench BG4 2026 QA
2026 MSHA Bench BG4 Statement of Facts
| Question | Answer |
|---|---|
| 1. A positive pressure leak could be caused by a _________ in or at device components. | leakage |
| 2. The battery in the Sentinel should be replaced every __ months. | 6 |
| 3. What is to be used to lubricate O-rings? | Dow Corning 111 |
| 4. The _________ ________ valve is designed to open when the pressure within the breathing circuit is between +20 and +50 millimeters (+2 mbar and +5 mbar) of pressure measured on the water gage. | pressure relief |
| 5. To prepare for testing adjust ____ point of the RZ-25 tester. | zero |
| 6. _____ adapter is used to connect the BG-4 apparatus to the RZ-25 tester. | test |
| 7. A leaky exhalation or inhalation valve could be caused by a defective _______ ________ or valve disc. | valve seat |
| 8. During the exhalation valve test, if valve is operating properly, ___ mbar is indicated on the pressure gauge. | -10 |
| 9. The EPDM breathing hoses use __________ Rings. | Bayonet |
| 10. During testing of the inhalation valve, if valve is operating properly, ___ mbar is indicated on the pressure gauge. | +10 |
| 11. During the positive pressure leak test, the pressure change within 1 minute must be ______ than 1 mbar. | lower |
| 12. Only __________ ____ is to be used to fill the refillable cartridge. | DRAGERSORB 400 |
| 13. The factory packed cartridge is good for ___ years from the manufacture date. | 4 |
| 14. A ________ pressure in the breathing circuit prevents ambient air from entering the system. | positive |
| 15. The BG-4 is __________ with a factory/refillable cartridge. | approved |
| 16. The Sentinel monitoring system comprises a sensor unit, _________, and Sentinel. | switchbox |
| 17. A steel cylinder is full at 3135 psi when a __ is stamped at hydro test. | + |
| 18. The BG-4 constant dosage must be 1.5 to ___ L/min. | 1.9 |
| 19. The drain valve should not open at less than __ mbar. | 10 |
| 20. A fully filled oxygen cylinder holds ____ liters of medical oxygen. | 440 |
| 21. The accuracy of the Sentinel pressure measurement is +or- __% of the final value. | 2 |
| 22. Never replace the battery in potentially ___________ areas. | explosive |
| 23. The weight of a fully charged BG-4 apparatus is 15kg (__ lbs.). | 33 |
| 24. Check the supply of oxygen gas on the Sentinel at intervals of approximately __minutes. | 15 |
| 25. During the constant dosage test, the breathing bag is inflated, the RZ-25 tester is set to red dosage, and the ________ _______valve is capped. | pressure relief |
| 26. During the constant dosage test, the needle of the RZ-25 tester should automatically settle between ___ and ___ LPM. | 1.5 and 1.9 |
| 27. The minimum valve provides greater than __ L/min flow. | 80 |
| 28. The breathing bag has a ___-liter volume. | 5.5 |
| 29. Insert speech diaphragm, install retainer ring and tighten with _______. | spanner |
| 30. The belt and harness must be _____ prior to storage, to prevent growth of mold and fungus. | dried |
| 31. The pressure reducer must be replaced every __ years. | 6 |
| 32. Symbol __with error code indicates a failed self-check. | X |
| 33. The pressure sensor converts __________ into digital signal. | pressure |
| 34. The cylinder connector and cylinder valve must not be contaminated with ___ or _________. | oil or grease |
| 35. Three ___________ socket head screws are used in the battery cover of the Sentinel. | hexagon |
| 36. Rubber parts must be particularly protected from direct exposure to __________. | radiation |
| 37. Do not use any ___________, such as acetone, alcohol, benzene, white spirit, trichloroethylene, etc. for cleaning rubber and silicone parts. | solvents |
| 38. The first low pressure warning occurs when the pressure drops to approximately ___ psi. | 700 |
| 39. At the first low pressure warning approximately __% of the oxygen has been used up. | 75 |
| 40. The last low-pressure warning occurs when the pressure drops to approximately ____ psi. | 145 |
| 41. During the low-pressure warning test, the alarm should activate at approximately ____ psi for a 4-hour apparatus. | 700 |
| 42. At the last low-pressure warning approximately ____% of the oxygen has been used up. | 95 |
| 43. To start the main alarm, press the ______ panic button in center of the Sentinel. | Yellow |
| 44. When the first low pressure warning occurs, the alarm sounds intermittently for approximately ___ seconds and the red LED flashes constantly. | 30 |
| 45. When the last low-pressure warning occurs, the alarm sounds intermittently without stopping and the _____ LED flashes constantly. | red |
| 46. Medium pressure in the BG-4 is between 58 psi and __ psi. | 64 |
| 47. ____________ pressure is delivered to the minimum valve. | Medium |
| 48. The drain valve opens at more than ___ mbar. | 10 |
| 49. The BG-4 breathing circuit is designed with an air cooler that can be filled with ice to reduce the temperature of the ______ breath. | inhaled |
| 50. Remove the ______ Key to activate the motion sensor. | Tally |
| 51. All parts which come in contact with the ________ air must be thoroughly cleaned and disinfected after use. | exhaled |
| 52. Disinfect parts by immersing them in a disinfectant bath using an approved ___________. | disinfectant |
| 53. Before washing the minimum valve, it is necessary to isolate the minimum valve with _____. | plug |
| 54. Attach minimum valve to breathing bag so that the _____ of the minimum valve and the mark on the breathing bag line up. | pin |
| 55. All parts which have been disinfected should be rinsed thoroughly under _______ _____. | running water |
| 56. CO2 absorber is not approved for use after indicated expiration date. | TRUE |
| 57. The maximum temperature of the air used to dry parts should not go above 60 degree C (____-degree F). | 140 |
| 58. Replace the high-pressure O-ring located on the pressure reducer __________ for units which are in constant use. | yearly |
| 59. U.S. Department of Transportation requires hydro tests on composite cylinders every __ years. | 5 |
| 60. Replace the O-ring at the plug-in coupling at least _____ every year for units which are in constant use. | once |
| 61. The inhalation/exhalation valve should be replaced every __ years for units which are in constant use. | 3 |
| 62. The O-ring under the speech diaphragm should be lubricated with ___ ______ ___. | Dow Corning 111. |
| 63. A steel oxygen cylinder must be retested by a certified testing facility every __ years. | 5 |
| 64. The BG-4 is approved for use at temperatures above -5 degree C (__-degree F) | 23 |
| 65. A defective _______ ________ should be replaced as needed. | pressure reducer |
| 66. Only oxygen (medical grade or better) with > ____% purity is to be used to fill the BG-4 oxygen cylinders. | 99.5 |
| 67. The use of ice in the cooling system is only required at ambient temperature above __ degree C (32-degree F). | 0 |
| 68. Pressurized ________ in contact with oil, grease, or other contamination can result in fire or explosion. | oxygen |
| 69. It is safe to use the BG 4 for up to __ hours with a battery warning 1 Icon. | 4 |
| 70. The battery must be replaced if battery warning __ Icon is indicated. | 2 |
| 71. A defective _______ ________ is the probable cause if the manual by-pass valve does not blow-off. | pressure reducer |
| 72. The _______ LED flashes to indicate that the Sentinel is operating normally. | green |
| 73. Bypass output is > __ L/min. | 50 |
| 74. Relief valve activation is __ bar or (87 psi). | 6 |
| 75. The oxygen cylinder burst disc ruptures at ______ psi (307 bar). | 4,450 |
| 76. Refillable cartridge concerns are _____ packing and under packing. | over |
| 77. The FPS 7000 masks allow __% peripheral vision. | 90 |
| 78. Polycarbonate or __________ lenses can be used in the mask. | Plexiglas |
| 79. A minimum of ____ psi is needed for a Sentinel to perform a proper high pressure leak test. | 2600 |
| 80. The drain valve opens at approximately __ mbar and is therefore out of the RZ reading range. | 15 |
| 81. To prepare the ice pack: fill the ice receptacle with water up to 2 inches from rim, freeze at least __hours @ -15 degree C (5-degree F), fill to rim with water, and freeze again for another 8 hours. | 16 |
| 82. If the speech diaphragm is deformed or shows signs of damage, it _____ be replaced. | must |
| 83. The BG-4 Sentinel lights up when the button is _______ pressed. | briefly |
| 84. Press then _______ the right-hand button to display temperature. | release |
| 85. Do not ______ Factory cartridges. | re-use |
| 86. The breathing hoses are equipped with _____________rings. | anti-crush |
| 87. When conducting component checks use a test pressure between +7 mbar and +10 mbar with a max pressure loss of __ mbar/min. | 1 |
| 88. Only the following batteries are approved for use in the Sentinel: Rayovac, _________, Panasonic and Ultra-life Lithium. | Eveready |
| Stack created by Jim Dean, WVU Mining Extension @ James.Dean@mail.wvu.edu |
Created by:
wvumext