Waveguide Pressurization System

Version 1

1. The Waveguide System provides what type of air?
A. Hot unfiltered air
B. Regulated, filter-dried air
C. Fuel-air mixture
D. Moist ambient air

2. One main purpose of drying the air is to prevent:
A. Ice formation in fuel lines
B. Arcing in high voltage components
C. Cabin fogging
D. Engine overheating

3. The filter removes what percentage of particles larger than 25 microns?
A. 90%
B. 95%
C. 100%
D. 75%

4. Particles larger than 10 microns are removed at what rate?
A. 98%
B. 100%
C. 85%
D. 50%

5. The Waveguide Pressure Regulating Valve outlet pressure range is:
A. 5–10 psia
B. 1–2 psia
C. 0.3–4.3 psia
D. 10–20 psia

6. The desiccator function is to:
A. Cool air
B. Increase pressure
C. Absorb moisture
D. Filter particles

7. The desiccator uses:
A. Activated carbon only
B. Silica gel and indicator agent
C. Oil filter
D. Metal mesh

8. Moisture saturation changes indicator color from:
A. Red to green
B. Blue to yellow
C. Blue to pink
D. White to black

9. Filter bypass opens when differential pressure reaches:
A. 1–2 psid
B. 3–4 psid
C. 4–5 psid
D. 8–10 psid

10. The regulating valve uses how many aneroids?
A. 1
B. 2
C. 3
D. 4

11. Primary aneroid regulates pressure by balancing air pressure and:
A. Oil pressure
B. Spring pressure
C. Fuel pressure
D. Electrical pressure

12. The check valve prevents:
A. Overheating
B. Pressure loss during overpressure
C. Moisture buildup
D. Electrical arcing

13. The reset indicator shows:
A. Normal operation
B. Overpressure event occurred
C. Low fuel
D. System failure

14. Air supply sources include:
A. Fuel system only
B. Engine bleed air only
C. Air cycle system or ground air
D. Hydraulic system

15. Filter contamination causes:
A. System shutdown
B. Pressure bypass opening
C. Valve destruction
D. Air loss completely

16. Desiccator indication window shows:
A. Fuel level
B. Moisture saturation
C. Air pressure
D. Electrical status

17. Normal desiccator color is:
A. Pink
B. Blue
C. Green
D. Red

18. The system protects against arcing in:
A. Hydraulic lines
B. Electronic waveguide cavities
C. Fuel tanks
D. Cabin vents

19. Air becomes usable after passing through:
A. Regulator only
B. Filter and desiccator system
C. Fuel tank
D. Compressor only

20. Overpressure relief occurs when pressure exceeds:
A. 2.0 psia
B. 3.0 psia
C. 4.3 psia
D. 6.0 psia

Version 1 Answers

Version 2

1. Main purpose of system is to supply:
A. Fuel pressure
B. Filtered dry air
C. Hydraulic fluid
D. Cooling fuel

2. Why is air dried?
A. Increase speed
B. Prevent electrical arcing
C. Improve combustion
D. Reduce noise

3. Filter removes particles larger than:
A. 50 microns
B. 25 microns
C. 5 microns
D. 1 micron

4. Efficiency for >10 micron particles:
A. 98%
B. 90%
C. 80%
D. 100%

5. Pressure regulator range:
A. 0–1 psia
B. 1–3 psia
C. 0.3–4.3 psia
D. 5–10 psia

6. Desiccator removes:
A. Oil
B. Moisture
C. Fuel
D. Heat

7. Indicator agent color when dry:
A. Pink
B. Blue
C. Yellow
D. Orange

8. Moisture saturation color:
A. Green
B. Blue
C. Pink
D. Black

9. Filter bypass opens at:
A. 1 psid
B. 2 psid
C. 4–5 psid
D. 10 psid

10. Regulating valve contains:
A. Pumps
B. Aneroids
C. Motors
D. Pistons

11. Primary aneroid balances air and:
A. Gravity
B. Spring force
C. Fuel flow
D. Electric load

12. Check valve function:
A. Increase flow
B. Maintain pressure during overpressure
C. Cool air
D. Filter particles

13. Reset indicator shows:
A. Low battery
B. Overpressure event
C. Normal flow
D. Fuel issue

14. Air sources include:
A. Cabin only
B. Ground air and air cycle system
C. Fuel pump
D. Battery air

15. Contaminated filter causes:
A. Shutdown
B. Bypass flow
C. Explosion
D. Valve lock

16. Desiccator inspection is through:
A. Fuel gauge
B. Inspection window
C. Cockpit display
D. Pressure sensor

17. System prevents arcing in:
A. Fuel tank
B. Waveguide cavities
C. Cabin windows
D. Hydraulic system

18. Air flows after:
A. Desiccator only
B. Filter and regulator
C. Fuel injection
D. Cooling fan

19. Overpressure relief occurs above:
A. 3.0 psia
B. 4.3 psia
C. 5.0 psia
D. 6.5 psia

20. Moisture is absorbed by:
A. Oil filter
B. Silica gel
C. Carbon filter
D. Fuel filter

Version 2 Answers

Version 3

1. System supplies air that is:
A. Hot and wet
B. Filtered and dry
C. Fuel mixed
D. Unfiltered

2. Main benefit of dry air:
A. Cooling engines
B. Prevent electrical arcing
C. Increase thrust
D. Reduce vibration

3. Filter removes particles above:
A. 10 microns
B. 20 microns
C. 25 microns
D. 30 microns

4. Efficiency for 10 micron particles:
A. 75%
B. 80%
C. 98%
D. 100%

5. Regulated pressure range:
A. 0.3–4.3 psia
B. 1–5 psia
C. 2–6 psia
D. 5–10 psia

6. Desiccator purpose:
A. Heat air
B. Remove moisture
C. Increase pressure
D. Add oxygen

7. Dry indicator color:
A. Blue
B. Red
C. Pink
D. Green

8. Wet indicator color:
A. Pink
B. Blue
C. White
D. Orange

9. Bypass opens at:
A. 1 psid
B. 2 psid
C. 4–5 psid
D. 6–7 psid

10. Valve uses:
A. Switches
B. Aneroids
C. Compressors
D. Sensors only

11. Primary aneroid balances air and:
A. Spring force
B. Oil pressure
C. Heat
D. Voltage

12. Check valve prevents:
A. Reverse flow
B. Overcooling
C. Fuel leak
D. Noise

13. Reset indicator shows:
A. Maintenance due
B. Overpressure event
C. Normal operation
D. Low pressure

14. Air sources include:
A. Ground air
B. Fuel system
C. Hydraulic pump
D. Cabin vents

15. Filter contamination causes:
A. Shutdown
B. Bypass flow
C. Explosion
D. Leak

16. Inspection window shows:
A. Pressure
B. Moisture level
C. Voltage
D. Fuel level

17. System protects against:
A. Ice formation
B. Arcing in waveguide cavities
C. Cabin noise
D. Fuel contamination

18. Air is regulated before:
A. Engine intake
B. Waveguide use
C. Cabin use
D. Fuel tank

19. Overpressure relief above:
A. 2.0 psia
B. 3.5 psia
C. 4.3 psia
D. 5.5 psia

20. Moisture absorber is:
A. Silica gel
B. Carbon fiber
C. Steel mesh
D. Foam