Powerplant Exam With complete solution– Expert Verified |
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1. What type of engines does the A220 have? - a. 2 Pratt and Whitney Pure Power
PW1524-G3 b. Hi-bypass
2. What are the 2 independent shafts? - a. N1 and N2
3. How many stages in N1 Low pressure compressor? - a. 3 stage
4. How many stages is the N2 High pressure compressors? - a. 8 stage
b. 2 stage
5. What is the percentage of air entering the compressor for combustion vs
outside the engine core? - a. 20% combustion
b. 80% bypass
6. The N1 drives what engine fan? - a. High bypass
7. Through a series of gears and shafts, N2 transmits mechanical power from the
engine to various accessories though the main gear box. Those include... - a.
Permanent Magnet Alternator Generator (PMAG)
b. Air Turbine Starter
c. Fuel pump controls
d. Hydraulic pumps
, e. Oil lube
f. Variable Frequency Generator (VFG)
8. What powers the FADEC and EEC? - a. Permanent Magnet Alternator Generator
(PMAG)
9. The PMAG requires a min of ____% N2 to power the EEC? - a. 10%
10. The fan drive gear system (FDGS) reduces fan speed by a ratio of
approximately: - a. One third of N1 speed or 3:1 ratio
11. What are the sources of bleed air for the Air Turbine Starter for engine
starting? - a. APU
b. Ground Power unit
c. Engine cross bleed
12. Does the ATS use high or low-pressure air? - a. High pressure
13. Does the ATS rotate the N2 or N1 for start? - a. N2
14. What oversees all engine starts? - a. EEC
15. Describe the engine start sequence: - a. Dry motor for approx. 30 seconds at
10-12%
b. Starter Air Valve Opens
c. Start ICON above N1
Latest Version | 100 Guaranteed Success
1. What type of engines does the A220 have? - a. 2 Pratt and Whitney Pure Power
PW1524-G3 b. Hi-bypass
2. What are the 2 independent shafts? - a. N1 and N2
3. How many stages in N1 Low pressure compressor? - a. 3 stage
4. How many stages is the N2 High pressure compressors? - a. 8 stage
b. 2 stage
5. What is the percentage of air entering the compressor for combustion vs
outside the engine core? - a. 20% combustion
b. 80% bypass
6. The N1 drives what engine fan? - a. High bypass
7. Through a series of gears and shafts, N2 transmits mechanical power from the
engine to various accessories though the main gear box. Those include... - a.
Permanent Magnet Alternator Generator (PMAG)
b. Air Turbine Starter
c. Fuel pump controls
d. Hydraulic pumps
, e. Oil lube
f. Variable Frequency Generator (VFG)
8. What powers the FADEC and EEC? - a. Permanent Magnet Alternator Generator
(PMAG)
9. The PMAG requires a min of ____% N2 to power the EEC? - a. 10%
10. The fan drive gear system (FDGS) reduces fan speed by a ratio of
approximately: - a. One third of N1 speed or 3:1 ratio
11. What are the sources of bleed air for the Air Turbine Starter for engine
starting? - a. APU
b. Ground Power unit
c. Engine cross bleed
12. Does the ATS use high or low-pressure air? - a. High pressure
13. Does the ATS rotate the N2 or N1 for start? - a. N2
14. What oversees all engine starts? - a. EEC
15. Describe the engine start sequence: - a. Dry motor for approx. 30 seconds at
10-12%
b. Starter Air Valve Opens
c. Start ICON above N1
