Volume 5

Card Set Information

Volume 5
2010-06-14 04:55:07
CDC Electrical Environmental 2A656

5-level CDCs for E&E (UREs)
Show Answers:

  1. A gaseous nitrogen charge is added to a liquid fire extinguishing agent in order to?
    Expel the agent from the bottle
  2. What component holds both a liquid agent and a nitrogen charge in a liquid-agent fire extinguishing container?
    Frangible disc
  3. In a liquid-agent fire extinguisher container, why is the frangible disc undercut into pie shaped sections?
    To break cleanly into large pieces
  4. What is the purpose of a time delay relay that is used on some liquid-agent fire extinguishing systems?
    To position the valves
  5. BANK #2 in a two-shot liquid-agent fire extinguishing system failed to discharge, while BANK #1 discharged normally. The most probably cause of this malfunction is what type of faulty switch?
    Discharge selector
  6. When depressed, which switch on a T-handle fire extinguishing system completes the circut to the squib?
    Agent discharge switch
  7. In the T-handle fire extinguishing system, the two-way check valve is pushed into position by the?
    Liquid agent
  8. In a T-handle liquid-agent fire extinguishing system, what happens when the container pressure becomes two low?
    A pressure switch closes
  9. Air that is trapped in a liquid coolant system has what effect?
    Reduces the colling capability of the coolant
  10. During initial start of a liquid coolant system, the controller timer energizes the solenoid shutoff valve closed for three minutes. The purpose of this action is to?
    Allow for system stabilization
  11. What component of a liquid coolant system is positioned by the temperature of the coolant?
    Thermal pilot valve
  12. In a liquid coolant system, what tells you that the liquid coolant filter is dirty?
    A mechanical pop-up indicator is activated
  13. When maintaining a liquid coolant system, over-torquing clamps may cause what to happen?
    Damage or failure of the component
  14. In a liquid coolant system, what is the purpose of purging the servicing unit supply hose?
    Prevent air from entering the system
  15. To ensure that a multiplace liferaft will inflate in extremely low temperatures, the inflation cylinder has a charge of?
  16. What component of a liferaft inflation cylinder assembly keeps CO2 within the cylinder and permits an unrestricted flow of CO2 to the liferaft?
    Discharge valve
  17. Releasing CO2 from a liferaft cylinder into a liferaft is normally done by activating the?
  18. What action do you take if you find corrosion on the inside of the liferaft inflation cylinder?
    Tag the cylinder for overhaul
  19. Liferaft inflation cylinders having an outside diameter of less than 2 inches and a length of less than 2 feet do not require?
    Hydrostatic testing
  20. After recharging a liferaft inflation cylinder, but before returning it to serviceable status, what do you do to the cylinder?
    Test for leaks, then reweigh after 24 hours
  21. Describe oxygen in its natural state
    Colorless, tasteless, odorless
  22. At altitudes between 10,000 and 15,000 feet, what is the greatest danger from hypoxia?
    Errors in judgement
  23. A complete loss of oxygen in a gaseous oxygen system is prevented by what type of valve?
    Check valve
  24. Supply and distribution tubing for aircraft oxygen systems is identified by cellulose tape in what colors?
    Green and white
  25. What valve decreases system pressure in a high-pressure oxygen system?
    Reducer valve
  26. In a high-pressure oxygen system, the tubing between the filler valve and the pressure reducer valve is made of?
    Copper alloy
  27. In a molecular sieve oxygen generating system, water droplets from the air are removed by a?
    MSOGS concentrator inlet filter
  28. Liquid oxygen converts to gaseous oxygen at an expansion ratio of?
    860 to 1
  29. In a liquid oxygen system, what component has the ability to draw gaseous oxygen from the top of the converter for breathing purposes?
    Pressure opening valve
  30. On an aircraft liquid oxygen system, the handle on a manually operated buildup and vent valve is designed to prevent?
    The filler access door from closing in the vent position
  31. Which one of these is a disadvantage of a continuous-flow oxygen regulator?
    It wastes oxygen
  32. When the cabin altitude of an aircraft reaches 30,000 feet, what component in the pressure-demand oxygen regulator causes 100 percent oxygen to be delivered to the user?
    Diluter aneroid
  33. When the PBG/ON/OFF toggle of an oxygen system is placed in the PBG position, what causes the availability of oxygen and pressure breathing?
    Positive signal from the anti-g valve
  34. Which oxygen system allows oxygen to flow automatically to the distribution system when cabin altitude reaches 12,500 feet?
    Troop system
  35. An H-2 emergency assembly (bailout bottle) supplies oxygen to the user for a maximum of about how many minutes?
  36. Assume a capacitance indicating system is being used to indicate the quantity of liquid oxygen in a converter. When the quantity of liguid oxygen in the converter decreases, what happens to the capacitance of the probe?
    It decreases
  37. A liquid oxygen system's pressure fails to stabilize at 110 psi. This could be caused by a failure of the?
    Converter relief valve
  38. A liquid oxygen system is continuously venting gaseous oxygen overboard. The most probable malfunction is a faulty?
    Pressure closing valve
  39. You should replace an oxygen mask-to-regulator connector if the no-go portion of the go-no-go gage passes through the?
    Smallest internal port
  40. The minimum required clearance between oxygen system tubing and aircraft control cables is?
    2 inches
  41. To reduce vibration and prevent chafing of oxygen system tubing, you should secure long runs of oxygen tubing at least every?
    15 inches
  42. How do you loosen a B-nut from a fitting on the tubing of an oxygen regulator?
    Hold the fitting to prevent twisting of the tubing
  43. An aircraft gaseous oxygen system must be purged only with?
    Gaseous oxygen
  44. On a gaseous oxygen servicing trailer, what controls the flow of oxygen?
    Servicing valves
  45. On a gaseous oxygen servicing trailer, what does the purifier assembly remove from gaseous oxygen?
  46. When servicing a gaseous oxygen system, you should gradually increase the servicing pressure in order to prevent?
    Overheating of oxygen cylinders
  47. What is the service test pressure for a low-pressure gaseous oxygen system leak test?
    425 to 450 psi
  48. When performing a high-pressure gaseous oxygen leak test, what minimum amount of time should you wait before taking the second system pressure reading?
    24 hours
  49. An oxygen regulator is considered to be leaking excessively if tester soap bubbles burst in less than how many seconds?
  50. In an oxygen system, a leak test solution indicates a leak by?
  51. The oxygen regulator field tester primarily uses what type of measurement to determine the condition of an oxygen regulator?
  52. Heat gain and liquid oxygen boil-off is minimized in the annular space of a TMU-27/M liquid oxygen storage and transfer cart by?
    Aluminized mylar insulation
  53. In a cryotainer, the transfer of heat by conduction is slowed with the use of?
    Stainless steel support struts
  54. What control valve on an oxygen storage and transfer unit is closed only during head pressure buildup or the transfer of liquid oxygen?
    Vent valve
  55. What determines how often you clean a cryotainer fill-drain and service line filter?
    Cleanliness of the liquid oxygen
  56. During an inspection of a cryotainer, you find a faulty pressure guage. What action should you take?
    Send the guage to TMDE for calibration