发动机航线维护答案2023秋

第三章测试

1.In the following descriptions, which one is NOT the function of MEC on CFM56-3 engine? ( )
A:Schedules fuel flow
B:Schedules the LPTCC valve
C:Schedules VSV’s and VBV’s positions
D:Schedules the HPTCC valve

答案:B
2.What’s the main purpose of the servo fuel heater on CFM56-3 engine? ( )
A:To increase the combustion fuel temperature
B:To decrease the scavenge oil temperature
C:To decrease the supply oil temperature
D:To increase the servo fuel temperature
3.In the following fuel nozzles on CFM56-3 engine, which one must have a richer primary flow path? ( )
A:fuel nozzle positions 14 and 15
B:fuel nozzle positions 1 and 20
C:fuel nozzle positions 4 and 5
D:fuel nozzle positions 1 and 2
4.What’s the Fail-Safe setting of T2.5 sensor on CFM56-3 engine? ( )
A:14.7PSI / 15℃
B:59℉ / 15℃
C:36℉ / 0℃
D:760 mmHg / 15℃
5.The CFM56-3 engine symptoms for a T2.5 cold shift are ( ).
A:Possible N1 overshoot/bloom on takeoff
B:Possibly cannot get takeoff power with high N2 and EGT
C:VSV track closed VBV track open
D:Slow starts and accelerations
6.T2.0 sensor on CFM56-3 engine supplies fuel pressure_________ to the MEC in proportion to the FIT. ( )
A:P7-Pb
B:P7-P6
C:Pc-Pb
D:P6-Pb
7.Which of the following signals goes into PMC through the J2 connector? ( )
A:Electrical power from control alternator
B:Ground support equipment
C:PS12
D:N1 and T12
8.How many throttle positions does B737-300 aircraft have when CFM56-3 engine is at idle speed? ( )
A:Two
B:Only one
C:Three
D:Four
9.How the PMC of CFM56-3 engine knows the thrust lever angle? ( )
A:N2 control alternator on the AGB sends an electrical power to PMC
B:a RVDT in cockpit senses the PLA and sends an electrical signal directly to PMC
C:a RVDT in MEC senses the PLA and sends an electrical signal to PMC
D:a LVDT in cockpit senses the PLA and sends an electrical signal directly to PMC
10.What equipment can transfer the electrical signal from PMC into servo fuel signal in MEC of CFM56-3 engine? ( )
A:An EHSV on MEC
B:Six EHSVs on HMU
C:A pilot valve in MEC
D:A torque motor on MEC