2A656 CDC 5
.jpg "2A656 CDC 5 - Quiz")
Electrical & Enviornmental 5 Level Test
- 1.
(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?
- A.
Safety device.
- B.
Tank vent valve.
- C.
Frangible metal disc.
- D.
Pressure relief valve.
Correct Answer
A. Safety device. -
- 2.
(815) What type of test does an oxygen regulator field tester perform?
- A.
Serviceability.
- B.
Operational.
- C.
Functional.
- D.
Inspection.
Correct Answer
B. Operational. -
- 3.
(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?
- A.
6 hours.
- B.
12 hours.
- C.
18 hours.
- D.
24 hours.
Correct Answer
D. 24 hours. -
- 4.
(814) An oxygen regulator is considered to be leaking excessively if tester soap bubbles burst in less than how many seconds?
- A.
5.
- B.
10.
- C.
15.
- D.
20.
Correct Answer
B. 10. -
- 5.
(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
- A.
10 psi.
- B.
25 psi.
- C.
35 psi.
- D.
50 psi.
Correct Answer
B. 25 psi. -
- 6.
(814) What is the service test pressure for a low-pressure gaseous oxygen system leak test?
- A.
300 to 325 psi.
- B.
350 to 375 psi.
- C.
425 to 450 psi.
- D.
475 to 500 psi.
Correct Answer
C. 425 to 450 psi. -
- 7.
(813) What is the maximum pressure of compressed air used for cleaning?
- A.
20 psi.
- B.
30 psi.
- C.
40 psi.
- D.
50 psi.
Correct Answer
B. 30 psi. -
- 8.
(813) The gaseous oxygen (GOX) cart pressure gauge must be replaced if it varies from the aircraft gauge by more than what amount?
- A.
±2 psig.
- B.
±4 psig.
- C.
±8 psig.
- D.
±10 psig.
Correct Answer
D. ±10 psig. -
- 9.
(813) On a gaseous oxygen servicing trailer, what does the purifier assembly remove from gaseous oxygen?
- A.
Odors.
- B.
Nitrogen.
- C.
Moisture.
- D.
Carbon dioxide
Correct Answer
C. Moisture. -
- 10.
(813) An aircraft gaseous oxygen system must be purged only with
- A.
Nitrogen.
- B.
Liquid oxygen.
- C.
Gaseous oxygen.
- D.
Compressed dry air.
Correct Answer
C. Gaseous oxygen. -
- 11.
(812) Which statement best describes the proper use of anti-seize tape in an oxygen system?
- A.
Use on flared fittings.
- B.
Apply only when a leak is suspected.
- C.
Use on all fittings through which liquid oxygen flows.
- D.
Apply a small amount on the first three threads of a pipe thread fitting.
Correct Answer
D. Apply a small amount on the first three threads of a pipe thread fitting. -
- 12.
(812) How do you loosen a B-nut from a fitting on the tubing of an oxygen regulator?
- A.
Hold the fitting with a wrench to prevent twisting of the tubing.
- B.
Hold the oxygen tubing by hand and allow the fitting to turn.
- C.
Apply anti-seize tape to the flare-end fitting threads.
- D.
Apply an approved lubricant to ease loosening of the B-nut.
Correct Answer
A. Hold the fitting with a wrench to prevent twisting of the tubing. -
- 13.
(812) To reduce vibration and prevent chafing of oxygen system tubing, you should secure long runs of oxygen tubing at least every
- A.
2 inches
- B.
6 inches
- C.
10 inches
- D.
15 inches
Correct Answer
D. 15 inches -
- 14.
(811) What is the minimum required clearance between oxygen system tubing and electrical wiring with electrical insulation and clamps installed?
- A.
1/4 inch.
- B.
1/2 inch.
- C.
3/4 inch.
- D.
1 inch.
Correct Answer
D. 1 inch. -
- 15.
(811) The minimum required clearance between oxygen system tubing and aircraft control cables is
- A.
1 inch.
- B.
2 inches.
- C.
3 inches.
- D.
4 inches.
Correct Answer
B. 2 inches. -
- 16.
(811) You should replace an oxygen mask-to-regulator connector if the no-go portion of the go-no-go gage passes through the
- A.
Mask connection.
- B.
Regulator connection.
- C.
Largest internal port.
- D.
Smallest internal port.
Correct Answer
D. Smallest internal port. -
- 17.
39. (810) A liquid oxygen (LOX) system is continuously venting gaseous oxygen overboard. The most probable malfunction is a faulty
- A.
Buildup coil.
- B.
Liquid check valve.
- C.
Pressure closing valve.
- D.
Quick disconnect coupling.
Correct Answer
C. Pressure closing valve. -
- 18.
(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
- A.
Supply relief valve.
- B.
Converter relief valve.
- C.
Pressure closing valve.
- D.
Combination fill, buildup, and vent valve.
Correct Answer
B. Converter relief valve. -
- 19.
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.
A. The liquid check valve will close.
- B.
The pressure closing valve will open.
- C.
The pressure closing valve will close.
- D.
The pressure opening valve will open.
Correct Answer
B. The pressure closing valve will open. -
- 20.
(809) Which oxygen system allows oxygen to flow automatically to the distribution system when cabin altitude reaches 12,500 feet?
- A.
Crew system.
- B.
Troop system.
- C.
Low-pressure system.
- D.
High-pressure system.
Correct Answer
B. Troop system. -
- 21.
(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?
- A.
Negative signal from the pressure-demand valve.
- B.
Negative signal from the emergency flow valve.
- C.
Positive signal from the diluter valve.
- D.
Positive signal from the anti-g valve.
Correct Answer
D. Positive signal from the anti-g valve. -
- 22.
(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?
- A.
Air inlet valve.
- B.
Demand valve.
- C.
Diluter aneroid.
- D.
Pressure breathing aneroid.
Correct Answer
C. Diluter aneroid. -
- 23.
(809) Which one of these is a disadvantage of a continuous-flow oxygen regulator?
- A.
It wastes oxygen.
- B.
It is unusable below 10,000 feet.
- C.
It is usable only above 20,000 feet.
- D.
It delivers oxygen at varying pressures.
Correct Answer
A. It wastes oxygen. -
- 24.
(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?
- A.
Pressure vent valve.
- B.
Pressure closing valve.
- C.
Pressure buildup valve.
- D.
Pressure opening valve.
Correct Answer
D. Pressure opening valve. -
- 25.
(809) If a leak develops in the inner shell of a liquid oxygen container, it will be protected from excessive pressure by the
- A.
Relief valve.
- B.
Reducer valve.
- C.
Blowout disc.
- D.
Diffuser disc.
Correct Answer
C. Blowout disc. -
- 26.
(809) Liquid oxygen converts to gaseous oxygen at an expansion ratio of
- A.
600 to 1.
- B.
680 to 1.
- C.
800 to 1.
- D.
860 to 1.
Correct Answer
D. 860 to 1. -
- 27.
(808) What does the molecular sieve oxygen generating system (MSOGS) concentrator supply to the OXYGEN regulator control panel?
- A.
Nitrogen.
- B.
16 man-minutes of oxygen.
- C.
93 percent oxygen-enriched gas.
- D.
100 percent oxygen-enriched gas.
Correct Answer
C. 93 percent oxygen-enriched gas. -
- 28.
(808) In a high-pressure oxygen system, the tubing between the filler valve and the pressure reducer valve is made of
- A.
Iron alloy.
- B.
Brass alloy.
- C.
Copper alloy.
- D.
Aluminum alloy.
Correct Answer
C. Copper alloy. -
- 29.
(808) What valve decreases system pressure in a high-pressure oxygen system?
- A.
Relief valve.
- B.
Closing valve.
- C.
Control valve.
- D.
Reducer valve.
Correct Answer
D. Reducer valve. -
- 30.
(808) Supply and distribution tubing for aircraft oxygen systems is identified by cellulose tape in what colors?
- A.
Black and red.
- B.
Blue and yellow.
- C.
Green and white.
- D.
Brown and orange.
Correct Answer
C. Green and white. -
- 31.
(808) Which part of the body usually suffers first from the effects of hypoxia?
- A.
Ears.
- B.
Eyes
- C.
Nose
- D.
Lungs
Correct Answer
B. Eyes -
- 32.
(808) Oxygen in its natural state is
- A.
Colorless, tasteless, and odorless.
- B.
Colorless, tasteless, and weightless.
- C.
Odorless, massless, and volumeless.
- D.
Odorless, massless, and weightless.
Correct Answer
A. Colorless, tasteless, and odorless. -
- 33.
(807) What is added to multiplace liferaft inflation cylinders to ensure proper discharge of the carbon dioxide (CO2)?
- A.
Dry argon.
- B.
Dry nitrogen.
- C.
Liquid argon.
- D.
Liquid nitrogen.
Correct Answer
B. Dry nitrogen. -
- 34.
(807) After recharging a liferaft inflation cylinder—but before returning it to serviceable status—
- A.
Repaint, then reweigh after 24 hours.
- B.
Repaint, then reweigh after 48 hours.
- C.
Test for leaks, then reweigh after 24 hours.
- D.
Test for leaks, then reweigh after 48 hours.
Correct Answer
C. Test for leaks, then reweigh after 24 hours. -
- 35.
(806) Liferaft inflation cylinders having an outside diameter of less than 2 inches and a length of less than 2 feet do not require
- A.
Stenciling
- B.
Recharging
- C.
Hydrostatic testing.
- D.
Corrosion treatment.
Correct Answer
C. Hydrostatic testing. -
- 36.
(806) How many pounds of carbon dioxide (CO2) does a fully charged shipping/storage cylinder contain?
- A.
25
- B.
50
- C.
75
- D.
100
Correct Answer
B. 50 -
- 37.
(805) Releasing carbon dioxide (CO2) from a liferaft cylinder into a liferaft is normally done by activating the
- A.
Cam.
- B.
Rupture disc.
- C.
Locking sleeve.
- D.
Check valve seat.
Correct Answer
A. Cam. -
- 38.
(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?
- A.
Diffuser plug.
- B.
Seating sleeve.
- C.
Cartridge filter.
- D.
Discharge valve.
Correct Answer
D. Discharge valve. -
- 39.
(805) To ensure that a multiplace liferaft will inflate in extremely low temperatures, the inflation cylinder has a charge of
- A.
Air.
- B.
Nitrogen.
- C.
Hydrogen.
- D.
Carbon dioxide.
Correct Answer
B. Nitrogen. -
- 40.
(805) Why are multiplace liferaft cylinders wire-wound and dip-soldered?
- A.
Decreases metal fatigue.
- B.
Adds strength to the cylinder.
- C.
Decreases cylinder expansion.
- D.
Increases cylinder corrosion resistance.
Correct Answer
B. Adds strength to the cylinder. -
- 41.
(804) In a liquid coolant system, what is the purpose of purging the servicing unit supply hose?
- A.
Remove air from the servicing cart.
- B.
Remove contaminants from the system.
- C.
Prevent air from entering the system.
- D.
Prevent moisture from entering the servicing cart.
Correct Answer
C. Prevent air from entering the system. -
- 42.
(804) When maintaining a liquid coolant system, over-torquing clamps may cause what to happen?
- A.
Leakage of the component.
- B.
Contamination of the component.
- C.
Damage or failure of the component.
- D.
Nothing happens.
Correct Answer
C. Damage or failure of the component. -
- 43.
(803) What components control the temperature of the coolant in a liquid coolant system?
- A.
Pump and heat exchanger.
- B.
Pump and thermal pilot valve.
- C.
Thermal modulating valve and heat exchanger.
- D.
Thermal modulating valve and thermal pilot valve.
Correct Answer
D. Thermal modulating valve and thermal pilot valve. -
- 44.
(803) In a liquid coolant system, what tells you that the liquid coolant filter is dirty?
- A.
The system shuts down.
- B.
A warning light flashes.
- C.
A warning horn alarm is activated.
- D.
A mechanical pop-up indicator is activated.
Correct Answer
D. A mechanical pop-up indicator is activated. -
- 45.
(803) What component of a liquid coolant system is positioned by the temperature of the coolant?
- A.
Thermal pilot valve.
- B.
Thermal modulating valve.
- C.
Delta system bypass valve.
- D.
Over-pressure relief valve.
Correct Answer
A. Thermal pilot valve. -
- 46.
(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
- A.
Prevent pressure surges.
- B.
Allow for rapid cool down.
- C.
Allow for system stabilization.
- D.
Provide rapid pressure buildup.
Correct Answer
C. Allow for system stabilization. -
- 47.
(803) What characteristic of the fluid used in a liquid coolant system makes it suitable as a coolant for electronic components?
- A.
Viscosity.
- B.
Resistance.
- C.
Metallic content.
- D.
Nonconductance.
Correct Answer
D. Nonconductance. -
- 48.
(803) How does a liquid coolant system keep electronic components cool?
- A.
Cycles coolant through the electronic component.
- B.
Cycles conditioned air through the electronic component.
- C.
Directs coolant across the electronic component.
- D.
Directs conditioned air across the electronic component.
Correct Answer
A. Cycles coolant through the electronic component. -
- 49.
(802) When depressed, which switch on a T-handle fire extinguishing system completes the circuit to the squib?
- A.
Time delay relay switch.
- B.
Agent discharge switch.
- C.
Engine selector switch.
- D.
Bottle selector switch.
Correct Answer
B. Agent discharge switch. -
- 50.
7. (802) In the T-handle fire extinguishing system, the two-way check valve is pushed into position by the
- A.
Liquid agent.
- B.
Discharge valve.
- C.
Agent discharge switch.
- D.
Gaseous nitrogen charge.
Correct Answer
A. Liquid agent. -
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Feb 15, 2013Quiz Edited by
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Apr 13, 2012Quiz Created by
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