2A656 CDC 5

1. (808) Oxygen in its natural state is

Colorless, tasteless, and odorless.

Colorless, tasteless, and weightless.

Odorless, massless, and volumeless.

Odorless, massless, and weightless.

2. (803) In a liquid coolant system, what tells you that the liquid coolant filter is dirty?

The system shuts down.

A warning light flashes.

A warning horn alarm is activated.

A mechanical pop-up indicator is activated.

3. (801) A gaseous nitrogen (N2) charge is added to a liquid fire extinguishing agent in order to

Convert the liquid to a gas upon discharge.

Expel the agent from the bottle.

Assist in extinguishing the fire.

Stabilize the temperature.

4. (805) To ensure that a multiplace liferaft will inflate in extremely low temperatures, the inflation cylinder has a charge of

Air.

Nitrogen.

Hydrogen.

Carbon dioxide.

5. (803) What characteristic of the fluid used in a liquid coolant system makes it suitable as a coolant for electronic components?

Viscosity.

Resistance.

Metallic content.

Nonconductance.

6. (809) Which one of these is a disadvantage of a continuous-flow oxygen regulator?

It wastes oxygen.

It is unusable below 10,000 feet.

It is usable only above 20,000 feet.

It delivers oxygen at varying pressures.

7. (805) Why are multiplace liferaft cylinders wire-wound and dip-soldered?

Decreases metal fatigue.

Adds strength to the cylinder.

Decreases cylinder expansion.

Increases cylinder corrosion resistance.

8. (801) In a liquid-agent fire extinguisher container, why is the frangible disc undercut into pie shaped sections?

To break easily.

To break cleanly into large pieces.

To stop the pieces from clogging the strainer.

To enable the pieces to pass easily through the strainer.

9. (808) Supply and distribution tubing for aircraft oxygen systems is identified by cellulose tape in what colors?

Black and red.

Blue and yellow.

Green and white.

Brown and orange.

10. (812) How do you loosen a B-nut from a fitting on the tubing of an oxygen regulator?

Hold the fitting with a wrench to prevent twisting of the tubing.

Hold the oxygen tubing by hand and allow the fitting to turn.

Apply anti-seize tape to the flare-end fitting threads.

Apply an approved lubricant to ease loosening of the B-nut.

11. (817) During an inspection of a cryotainer, you find a faulty pressure gage. What action should you take?

Condemn the gage.

Compare the gage with another gage.

Send the gage to TMDE for calibration.

Adjust the gage after you complete the inspection.

12. (807) After recharging a liferaft inflation cylinder—but before returning it to serviceable status—

Repaint, then reweigh after 24 hours.

Repaint, then reweigh after 48 hours.

Test for leaks, then reweigh after 24 hours.

Test for leaks, then reweigh after 48 hours.

13. (802) A flashing red light on the fire emergency control T-handle indicates

An open fuel valve.

Closed air valves.

An overheat condition.

A fire.

14. (807) What is added to multiplace liferaft inflation cylinders to ensure proper discharge of the carbon dioxide (CO2)?

Dry argon.

Dry nitrogen.

Liquid argon.

Liquid nitrogen.

15. (803) 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

Prevent pressure surges.

Allow for rapid cool down.

Allow for system stabilization.

Provide rapid pressure buildup.

16. (821) While transferring liquid oxygen from an oxygen storage and transfer cart to an aircraft oxygen converter, you note the rate of transfer is very slow. What would cause this malfunction?

Excessive boiloff.

Low tank pressure.

Settling of the perlite.

Leaking vacuum valve.

17. (808) What does the molecular sieve oxygen generating system (MSOGS) concentrator supply to the OXYGEN regulator control panel?

Nitrogen.

16 man-minutes of oxygen.

93 percent oxygen-enriched gas.

100 percent oxygen-enriched gas.

18. (806) Liferaft inflation cylinders having an outside diameter of less than 2 inches and a length of less than 2 feet do not require

Stenciling

Recharging

Hydrostatic testing.

Corrosion treatment.

19. (805) Releasing carbon dioxide (CO2) from a liferaft cylinder into a liferaft is normally done by activating the

Cam.

Rupture disc.

Locking sleeve.

Check valve seat.

20. (804) When maintaining a liquid coolant system, over-torquing clamps may cause what to happen?

Leakage of the component.

Contamination of the component.

Damage or failure of the component.

Nothing happens.

21. (803) How does a liquid coolant system keep electronic components cool?

Cycles coolant through the electronic component.

Cycles conditioned air through the electronic component.

Directs coolant across the electronic component.

Directs conditioned air across the electronic component.

22. (817) What action should you take after determining that a liquid oxygen (LOX) tank valve is leaking through the valve seat?

Replace the Nylon seal.

Replace the Teflon seal.

Repair the Nylon seal.

Repair the Teflon seal.

23. (822) What is the minimum safe distance when servicing or maintenance is being performed on the nitrogen servicing unit?

30 feet.

40 feet.

50 feet.

60 feet.

24. (813) On a gaseous oxygen servicing trailer, what does the purifier assembly remove from gaseous oxygen?

Odors.

Nitrogen.

Moisture.

Carbon dioxide

25. (812) Which statement best describes the proper use of anti-seize tape in an oxygen system?

Use on flared fittings.

Apply only when a leak is suspected.

Use on all fittings through which liquid oxygen flows.

Apply a small amount on the first three threads of a pipe thread fitting.

26. (808) Which part of the body usually suffers first from the effects of hypoxia?

Ears.

Eyes

Nose

Lungs

27. 7. (802) In the T-handle fire extinguishing system, the two-way check valve is pushed into position by the

Liquid agent.

Discharge valve.

Agent discharge switch.

Gaseous nitrogen charge.

28. (802) The purpose of a time delay relay that is used on some liquid-agent fire extinguishing systems is to

Position the valves.

Select the fire bottle bank.

Prime the explosive cartridge.

Prevent discharging of the agent.

29. (818) Which reference contains procedures for cleaning oxygen components?

15X–1–1.

1–1A–14.

1–1A–15.

8–1–1.

30. (813) An aircraft gaseous oxygen system must be purged only with

Nitrogen.

Liquid oxygen.

Gaseous oxygen.

Compressed dry air.

31. (809) Liquid oxygen converts to gaseous oxygen at an expansion ratio of

600 to 1.

680 to 1.

800 to 1.

860 to 1.

32. (815) What type of test does an oxygen regulator field tester perform?

Serviceability.

Operational.

Functional.

Inspection.

33. (816) What control valve on an oxygen storage and transfer unit is closed only during ground transport, head pressure buildup, or the transfer of liquid oxygen?

Fill valve.

Vent valve.

Buildup valve.

Vacuum valve.

34. (813) What is the maximum pressure of compressed air used for cleaning?

20 psi.

30 psi.

40 psi.

50 psi.

35. (812) To reduce vibration and prevent chafing of oxygen system tubing, you should secure long runs of oxygen tubing at least every

2 inches

6 inches

10 inches

15 inches

36. (811) The minimum required clearance between oxygen system tubing and aircraft control cables is

1 inch.

2 inches.

3 inches.

4 inches.

37. (809) Which oxygen system allows oxygen to flow automatically to the distribution system when cabin altitude reaches 12,500 feet?

Crew system.

Troop system.

Low-pressure system.

High-pressure system.

38. (803) What components control the temperature of the coolant in a liquid coolant system?

Pump and heat exchanger.

Pump and thermal pilot valve.

Thermal modulating valve and heat exchanger.

Thermal modulating valve and thermal pilot valve.

39. (814) An oxygen regulator is considered to be leaking excessively if tester soap bubbles burst in less than how many seconds?

5.

10.

15.

20.

40. (811) You should replace an oxygen mask-to-regulator connector if the no-go portion of the go-no-go gage passes through the

Mask connection.

Regulator connection.

Largest internal port.

Smallest internal port.

41. (806) How many pounds of carbon dioxide (CO2) does a fully charged shipping/storage cylinder contain?

25

50

75

100

42. (814) When performing a high-pressure gaseous oxygen leak test, what minimum amount of time should you wait before taking the second system pressure reading?

6 hours.

12 hours.

18 hours.

24 hours.

43. 39. (810) A liquid oxygen (LOX) system is continuously venting gaseous oxygen overboard. The most probable malfunction is a faulty

Buildup coil.

Liquid check valve.

Pressure closing valve.

Quick disconnect coupling.

44. (804) In a liquid coolant system, what is the purpose of purging the servicing unit supply hose?

Remove air from the servicing cart.

Remove contaminants from the system.

Prevent air from entering the system.

Prevent moisture from entering the servicing cart.

45. (802) BANK no. 2 in a two-shot liquid-agent fire extinguishing system failed to discharge, while BANK no. 1 discharged normally. The most probable cause of this malfunction is what type of faulty switch?

Engine selector.

Agent discharge.

Time delay relay.

Discharge selector.

46. (803) What component of a liquid coolant system is positioned by the temperature of the coolant?

Thermal pilot valve.

Thermal modulating valve.

Delta system bypass valve.

Over-pressure relief valve.

47. (820) The vacuum gage for a cryotainer is designed to read the pressure in the annular space in

Inches of water.

Microns of water.

Inches of mercury.

Microns of mercury.

48. (809) 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?

Air inlet valve.

Demand valve.

Diluter aneroid.

Pressure breathing aneroid.

49. (809) If a leak develops in the inner shell of a liquid oxygen container, it will be protected from excessive pressure by the

Relief valve.

Reducer valve.

Blowout disc.

Diffuser disc.

50. (819) You are purging a liquid oxygen (LOX) storage and transfer cart. You can consider the purge to be complete when the temperature of the air exiting the fill and drain outlet has been maintained at what temperature for 1 hour?

220°F.

250°F.

320°F.

350°F.

51. (813) The gaseous oxygen (GOX) cart pressure gauge must be replaced if it varies from the aircraft gauge by more than what amount?

±2 psig.

±4 psig.

±8 psig.

±10 psig.

52. (808) What valve decreases system pressure in a high-pressure oxygen system?

Relief valve.

Closing valve.

Control valve.

Reducer valve.

53. (805) What component of a liferaft inflation cylinder assembly keeps carbon dioxide (CO2) within the cylinder and permits an unrestricted flow of CO2 to the liferaft?

Diffuser plug.

Seating sleeve.

Cartridge filter.

Discharge valve.

54. (802) When depressed, which switch on a T-handle fire extinguishing system completes the circuit to the squib?

Time delay relay switch.

Agent discharge switch.

Engine selector switch.

Bottle selector switch.

55. (819) After purging a liquid oxygen (LOX) storage and transfer cart, allow the fill and drain outlet temperature to cool down to what maximum temperature before turning off the purge unit blower motor?

125°F.

150°F.

175°F.

200°F.

56. (816) If a leak develops in the inner tank of a TMU–27/M cryotainer, what component will protect the outer tank from rupturing due to excessive pressure?

Safety device.

Tank vent valve.

Frangible metal disc.

Pressure relief valve.

57. (809) 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?

Negative signal from the pressure-demand valve.

Negative signal from the emergency flow valve.

Positive signal from the diluter valve.

Positive signal from the anti-g valve.

58. (814) You are performing a leakage test of a low-pressure gaseous oxygen system. For flights above 10,000 feet, the maximum pressure drop allowed between the first and second pressure reading is

10 psi.

25 psi.

35 psi.

50 psi.

59. (808) In a high-pressure oxygen system, the tubing between the filler valve and the pressure reducer valve is made of

Iron alloy.

Brass alloy.

Copper alloy.

Aluminum alloy.

60. (822) The low pressure side of the nitrogen servicing unit can be regulated to service pressures between

0 to 200 psig.

0 to 250 psig.

0 to 300 psig.

0 to 350 psig.

61. 37. (810) What happens when extended demand on a liquid oxygen (LOX) system causes converter head pressure to drop below 70 pounds per square inch (psi)?

A. The liquid check valve will close.

The pressure closing valve will open.

The pressure closing valve will close.

The pressure opening valve will open.

62. (820) The TMU–27/M oxygen storage and transfer cart is connected to a vacuum pump by an adapter called a vacuum

Tank blowout disc.

Seal-off operator.

Tank rupture disc.

Valve connection plate.

63. (811) What is the minimum required clearance between oxygen system tubing and electrical wiring with electrical insulation and clamps installed?

1/4 inch.

1/2 inch.

3/4 inch.

1 inch.

64. (816) The transfer hose on a liquid oxygen (LOX) cart is made from stainless steel and

Bronze alloy.

Copper alloy.

Titanium alloy.

Aluminum alloy.

65. (809) In a liquid oxygen (LOX) system, what component has the ability to draw gaseous oxygen from the top of the converter for breathing purposes?

Pressure vent valve.

Pressure closing valve.

Pressure buildup valve.

Pressure opening valve.

66. (814) What is the service test pressure for a low-pressure gaseous oxygen system leak test?

300 to 325 psi.

350 to 375 psi.

425 to 450 psi.

475 to 500 psi.

67. (822) The rupture disc on the nitrogen servicing unit will blow when pressure inside the tank reaches

450 to 600 psig.

475 to 600 psig.

500 to 600 psig.

525 to 600 psig.

68. (810) A liquid oxygen (LOX) system's pressure fails to stabilize at 110 pounds per square inch(psi). This could be caused by a failure of the

Supply relief valve.

Converter relief valve.

Pressure closing valve.

Combination fill, buildup, and vent valve.

2A656 CDC 5

1. (808) Oxygen in its natural state is

2.

What first name or nickname would you like us to use?

2. (803) In a liquid coolant system, what tells you that the liquid coolant filter is dirty?

3. (801) A gaseous nitrogen (N2) charge is added to a liquid fire extinguishing agent in order to

4. (805) To ensure that a multiplace liferaft will inflate in extremely low temperatures, the inflation cylinder has a charge of

5. (803) What characteristic of the fluid used in a liquid coolant system makes it suitable as a coolant for electronic components?

6. (809) Which one of these is a disadvantage of a continuous-flow oxygen regulator?

7. (805) Why are multiplace liferaft cylinders wire-wound and dip-soldered?

8. (801) In a liquid-agent fire extinguisher container, why is the frangible disc undercut into pie shaped sections?

9. (808) Supply and distribution tubing for aircraft oxygen systems is identified by cellulose tape in what colors?

10. (812) How do you loosen a B-nut from a fitting on the tubing of an oxygen regulator?

11. (817) During an inspection of a cryotainer, you find a faulty pressure gage. What action should you take?

12. (807) After recharging a liferaft inflation cylinder—but before returning it to serviceable status—

13. (802) A flashing red light on the fire emergency control T-handle indicates

14. (807) What is added to multiplace liferaft inflation cylinders to ensure proper discharge of the carbon dioxide (CO2)?

15. (803) 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

16. (821) While transferring liquid oxygen from an oxygen storage and transfer cart to an aircraft oxygen converter, you note the rate of transfer is very slow. What would cause this malfunction?

17. (808) What does the molecular sieve oxygen generating system (MSOGS) concentrator supply to the OXYGEN regulator control panel?

18. (806) Liferaft inflation cylinders having an outside diameter of less than 2 inches and a length of less than 2 feet do not require

19. (805) Releasing carbon dioxide (CO2) from a liferaft cylinder into a liferaft is normally done by activating the

20. (804) When maintaining a liquid coolant system, over-torquing clamps may cause what to happen?

21. (803) How does a liquid coolant system keep electronic components cool?

22. (817) What action should you take after determining that a liquid oxygen (LOX) tank valve is leaking through the valve seat?

23. (822) What is the minimum safe distance when servicing or maintenance is being performed on the nitrogen servicing unit?

24. (813) On a gaseous oxygen servicing trailer, what does the purifier assembly remove from gaseous oxygen?

25. (812) Which statement best describes the proper use of anti-seize tape in an oxygen system?

26. (808) Which part of the body usually suffers first from the effects of hypoxia?

27. 7. (802) In the T-handle fire extinguishing system, the two-way check valve is pushed into position by the

28. (802) The purpose of a time delay relay that is used on some liquid-agent fire extinguishing systems is to

29. (818) Which reference contains procedures for cleaning oxygen components?

30. (813) An aircraft gaseous oxygen system must be purged only with

31. (809) Liquid oxygen converts to gaseous oxygen at an expansion ratio of

32. (815) What type of test does an oxygen regulator field tester perform?

33. (816) What control valve on an oxygen storage and transfer unit is closed only during ground transport, head pressure buildup, or the transfer of liquid oxygen?

34. (813) What is the maximum pressure of compressed air used for cleaning?

35. (812) To reduce vibration and prevent chafing of oxygen system tubing, you should secure long runs of oxygen tubing at least every

36. (811) The minimum required clearance between oxygen system tubing and aircraft control cables is

37. (809) Which oxygen system allows oxygen to flow automatically to the distribution system when cabin altitude reaches 12,500 feet?

38. (803) What components control the temperature of the coolant in a liquid coolant system?

39. (814) An oxygen regulator is considered to be leaking excessively if tester soap bubbles burst in less than how many seconds?

40. (811) You should replace an oxygen mask-to-regulator connector if the no-go portion of the go-no-go gage passes through the

41. (806) How many pounds of carbon dioxide (CO2) does a fully charged shipping/storage cylinder contain?

42. (814) When performing a high-pressure gaseous oxygen leak test, what minimum amount of time should you wait before taking the second system pressure reading?

43. 39. (810) A liquid oxygen (LOX) system is continuously venting gaseous oxygen overboard. The most probable malfunction is a faulty

44. (804) In a liquid coolant system, what is the purpose of purging the servicing unit supply hose?

45. (802) BANK no. 2 in a two-shot liquid-agent fire extinguishing system failed to discharge, while BANK no. 1 discharged normally. The most probable cause of this malfunction is what type of faulty switch?

46. (803) What component of a liquid coolant system is positioned by the temperature of the coolant?

47. (820) The vacuum gage for a cryotainer is designed to read the pressure in the annular space in

48. (809) 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?

49. (809) If a leak develops in the inner shell of a liquid oxygen container, it will be protected from excessive pressure by the

50. (819) You are purging a liquid oxygen (LOX) storage and transfer cart. You can consider the purge to be complete when the temperature of the air exiting the fill and drain outlet has been maintained at what temperature for 1 hour?

51. (813) The gaseous oxygen (GOX) cart pressure gauge must be replaced if it varies from the aircraft gauge by more than what amount?

52. (808) What valve decreases system pressure in a high-pressure oxygen system?

53. (805) What component of a liferaft inflation cylinder assembly keeps carbon dioxide (CO2) within the cylinder and permits an unrestricted flow of CO2 to the liferaft?

54. (802) When depressed, which switch on a T-handle fire extinguishing system completes the circuit to the squib?

55. (819) After purging a liquid oxygen (LOX) storage and transfer cart, allow the fill and drain outlet temperature to cool down to what maximum temperature before turning off the purge unit blower motor?

56. (816) If a leak develops in the inner tank of a TMU–27/M cryotainer, what component will protect the outer tank from rupturing due to excessive pressure?

57. (809) 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?

58. (814) You are performing a leakage test of a low-pressure gaseous oxygen system. For flights above 10,000 feet, the maximum pressure drop allowed between the first and second pressure reading is

59. (808) In a high-pressure oxygen system, the tubing between the filler valve and the pressure reducer valve is made of

60. (822) The low pressure side of the nitrogen servicing unit can be regulated to service pressures between

61. 37. (810) What happens when extended demand on a liquid oxygen (LOX) system causes converter head pressure to drop below 70 pounds per square inch (psi)?

62. (820) The TMU–27/M oxygen storage and transfer cart is connected to a vacuum pump by an adapter called a vacuum

63. (811) What is the minimum required clearance between oxygen system tubing and electrical wiring with electrical insulation and clamps installed?

64. (816) The transfer hose on a liquid oxygen (LOX) cart is made from stainless steel and

65. (809) In a liquid oxygen (LOX) system, what component has the ability to draw gaseous oxygen from the top of the converter for breathing purposes?

66. (814) What is the service test pressure for a low-pressure gaseous oxygen system leak test?

67. (822) The rupture disc on the nitrogen servicing unit will blow when pressure inside the tank reaches

68. (810) A liquid oxygen (LOX) system's pressure fails to stabilize at 110 pounds per square inch(psi). This could be caused by a failure of the