发动机航线维护 知到智慧树答案2024 z40011

第一章 单元测试

1、 The description in Chapter 73 of AMM is about ( ).

A:Exhaust System
B:Engine Fuel and Control System
C:Oil System
D:Air System
答案: Engine Fuel and Control System

2、 How many engine mounts does the CFM56-3 have?（ ）。

A:1
B:2
C:3
D:4
答案: 2

3、 CFM56-3 is a _ turbofan engine. ( )

A:High bypass, three rotor
B:Low bypass, dual rotor
C:High bypass, dual rotor
D:Low bypass, three rotor
答案: High bypass, dual rotor

4、 The data plate has NOT the data of（ ）。

A:Engine model number
B:Thrust ratings
C:Airframe type
D:TC Number
答案: Airframe type

5、 The CFM56-3 engine supplies ____ for the Boeing 737-300/-400/-500 aircraft. ( )

A:thrust, electric, hydraulic, pneumatic
B:thrust, electric, hydraulic, fuel and oil
C:thrust, bleed air, hydraulic, pneumatic
D:thrust, lift force, hydraulic, pneumatic
答案: thrust, electric, hydraulic, pneumatic

第二章 单元测试

1、 Which component on CFM56-3 engine produces the most thrust? ( )

A:Turbine
B:Combustor
C:Exhaust nozzle
D:Fan
答案: Fan

2、 The aerodynamic station of 12 on CFM56-3 engine is ( ).

A:The primary air inlet
B:The engine inlet
C:The secondary air inlet
D:The inlet of booster
答案: The secondary air inlet

3、 Which bearing can hold the axially load of the N2 rotor? ( )

A:No.1 ball bearing
B:No.2 ball bearing
C:No.3 ball bearing
D:No.4 roller bearing
答案: No.3 ball bearing

4、 What bearings on CFM56-3 engine are roller bearing? ( )

A:No.1, No.2 and No.3 bearings
B:No.2, No.3 and No.4 bearings
C:No.3, No.4 and No.5 bearings
D:No.2, No.4 and No.5 bearings
答案: No.2, No.4 and No.5 bearings

5、 The power source for driving fan and booster rotor is from ( ).

A:HPT
B:CSD assembly
C:LPT
D:Air-driving gear box
答案: LPT

6、 The air used for CFM56-3 HPT blades cooling is ( ).

A:CDP air
B:HPC 5th air
C:Booster discharge air
D:HPC 4th air
答案: CDP air

7、 How many fan blades does CFM56-7B engine have? ( )

A:18
B:24
C:36
D:38
答案: 24

8、 Which balancing screw for the rebalance of CFM56-3 engine is the lightest? ( )

A:P01
B:P06
C:P07
D:P08
答案: P07

9、 In the following accessory pads on CFM56-3 engine, which one need to use carbon seal? ( )

A:Lube unit and fuel pump
B:Lube unit and hydraulic pump
C:Air starter and hydraulic pump
D:Control alternator and fuel pump
答案: Air starter and hydraulic pump

10、 How many stages of LPT does CFM56-3 engine have? ( )

A:1
B:2
C:3
D:4
答案: 4

第三章 单元测试

1、 In the following descriptions, which one is NOT the function of MEC on CFM56-3 engine? ( )

A:Schedules fuel flow
B:Schedules VSV’s and VBV’s positions
C:Schedules the HPTCC valve
D:Schedules the LPTCC valve
答案: Schedules the LPTCC valve

2、 What’s the main purpose of the servo fuel heater on CFM56-3 engine? ( )

A:To decrease the scavenge oil temperature
B:To increase the combustion fuel temperature
C:To decrease the supply oil temperature
D:To increase the servo fuel temperature
答案: 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 2
C:fuel nozzle positions 1 and 20
D:fuel nozzle positions 4 and 5
答案: fuel nozzle positions 14 and 15

4、 What’s the Fail-Safe setting of T2.5 sensor on CFM56-3 engine? ( )

A:14.7PSI / 15℃
B:760 mmHg / 15℃
C:59℉ / 15℃
D:36℉ / 0℃
答案: 59℉ / 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:Slow starts and accelerations
D:VSV track closed VBV track open
答案: Possible N1 overshoot/bloom on takeoff

6、 T2.0 sensor on CFM56-3 engine supplies fuel pressure___ to the MEC in proportion to the FIT. ( )

A:Pc-Pb
B:P6-Pb
C:P7-P6
D:P7-Pb
答案: P7-Pb

7、 Which of the following signals goes into PMC through the J2 connector? ( )

A:PS12
B:N1 and T12
C:Electrical power from control alternator
D:Ground support equipment
答案: Electrical power from control alternator

8、 How many throttle positions does B737-300 aircraft have when CFM56-3 engine is at idle speed? ( )

A:Only one
B:Two
C:Three
D:Four
答案: Only one

9、 How the PMC of CFM56-3 engine knows the thrust lever angle? ( )

A:a RVDT in cockpit senses the PLA and sends an electrical signal directly to PMC
B:a RVDT in MEC senses the PLA and sends an electrical signal to PMC
C:N2 control alternator on the AGB sends an electrical power to PMC
D:a LVDT in cockpit senses the PLA and sends an electrical signal directly to PMC
答案: a RVDT in MEC senses the PLA and sends an electrical signal to PMC

10、 What equipment can transfer the electrical signal from PMC into servo fuel signal in MEC of CFM56-3 engine? ( )

A:Six EHSVs on HMU
B:An EHSV on MEC
C:A torque motor on MEC
D:A pilot valve in MEC
答案: A torque motor on MEC

第四章 单元测试

1、 How many igniter plugs does CFM56-3 engine have? ( )

A:5
B:4
C:3
D:2
答案: 2

2、 The CONT position supplies continuous power to the ignition exciters during ( ).

A:aircraft on the ground
B:flight
C:engine start on the ground
D:engine restart in the flight
答案: flight

3、 Which one is TRUE in the following descriptions about the ignition system of CFM56-3 engine? ( )

A:Do not apply grease to the threads on the ignition lead end of the igniter plug.
B:Only need one gasket controls the depth the igniter plugs go into the combustion chamber.
C:The Low-energy exciter output is 1 spark per second, 1 joules per spark.
D:There is no need to provide cooling air around the ignition leads to decrease temperature
答案: Do not apply grease to the threads on the ignition lead end of the igniter plug.

4、 On CFM56-3 engine, high-energy exciter output is ( ).

A:1 sparks per second, 1 joules per spark
B:1 sparks per second, 2 joules per spark
C:2 sparks per second, 1 joules per spark
D:2 sparks per second, 2 joules per spark
答案: 2 sparks per second, 2 joules per spark

5、

What are the input of the ignition exciters of the CFM56-3? 

A: 115V AC input.       
B:230V AC input. 
C:28V DC.            
D: 14－20KV input.    
答案:  115V AC input.       

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