APU知识点

拐幺捌 · 发表于 2013-6-14 19:45:28

49. APU
   1.When APU bleed valve is open with no
packs operating or main engine being started.
What mode APU operates ?
a.No bleed mode.
b.Duct pressurization mode.
c.ECS mode.
d.MES mode.
   2.APU Gen
Control Unit ( AGCU ) receives a RTL ( Ready To Load ) signal from ECU when
speed is more than :
a.91 %.
b.93 %.
c.95 %.
d.97 %.
   3.Which one of the following statement is
correct ?
a.The HP spool has 9 Compressor stage 2 turbine stages.
b.The LP-spool has 1 fan, 4 booster stages and 3 turbine stages.
c.The HP spoollhas 10 compressorstage 2 turbine stages.
d.The LP spool has 1 fan, 3 booster stages and 4 turbine stages.
   4.What is correct
concerning an illuminated blue APU `MAINT` light ?
      a.That the APU needs to be serviced with oil.
      b.That the APU ECU has maintenance faults logged in memory.
      c.That the APU has performed a protective shutdown due to low oil pressure.
      d.A & B of above the mention are correct.
   5.When The
low oil pressure light goes out during apu starting?
a. At 7 % speed.
b. At 30 % speed.
c. At 60 % speed.
d. At 70 % speed.
   6.What is the result if one of the two
thermocouple takes fails ?
a.The APU will run normally and an EGT thermocouple fault is stored
in the ECU.
b.  The APU will
not start and an EGT TC fault is strored in the ECU.
c.The blue “MAINT ” light illuminate.
d. All answer are correct.
7.Which APU components use servo fuel as
muscle pressure ?
a. APU inlet door actuator and the eductor control valve.
b. APU bleed air valve and exhaust nozzle deflector.
c. IGV actuator and Surge Control Valve.
d. Transient Bleed Valve
   8.Following subsystem are part of
Compressor Air flow control, except :
a.Variable Bleed Valve ( VBV ).
b.VARIABLE Startor Vanes.
c.Transient Bleed
Valve.
d. Fuel Metering Valve.

9.When is ignition cut-off during APU starting ?
a. At 30 %
b. At 45 %..
c. At 60 %
d. At 95 %.
  10.What is true concerning the DMM (Data
Memori Module ) and the APU ECU. ?
a. When replacing the ECU also requires that the DMM is replaced.
b. The ECU and the DMM not tobe replaced at the same time.
c.  The DMM is responsible for
every APU start-up sequences.
d.  All answer are correct.
  11.Which of the filters on the APU has
protective shut down logic in case of clogging ?          a. The
a. The scavange oil filter for
the starter generator.
b. The
fuel suplly filter on the fuel control
  c. The oil supply filter
on the lube module.
d.The oil / fuel supply
filter on the lube module.
12.The physical feature of the APU installed
on B737-600/700/800 is as follows
  a.Air inlet section giving the air inlet
to combustion compressor and load compresso

b.The combustion section consist of centrifugal flow
compressor, annular combustion chamber and axial flow turbine

   c.The load compressor and the accessory
gear box

   d.As
mention as a, b and c

  13.The physical feature of the APU installed
on B737-600/700/800/900 is as follows

   a.Air
inlet section, combustor, load compressor and accessory gearbox

   b.Compressor, combustion chamber, turbine
and accessory gear box

   c.Compressor, combustion chamber, turbine

   d.As mention as a, b and c

14.Where is the location of the ECU

   a.Forward cargo

   b.Aft
cargo

   c.E/E compartment

   d.Apu Compartment

15.In the fuel control unit, what are  the operated by the ECU

   a.Fuel metering valve

   b.Fuel shut of valve

   c.Fuel pump

   d.A
and B are thrue

16.In the fuel control unit, what are  the operated by the ECU

   a.Fuel
metering valve and fuel shut off valve

   b.Fuel metering valve and fuel pump

   c.Fuel pump

   d.A and B are thrue

17.What is the output of the FCU

   a.Combustion
fuel metered by FMV and servo fuel to operate IGV and SCV

   b.Combustion fuel metered by FMV and
servo fuel to operate IGV

c.Combustion fuel metered by FMV and
servo fuel to operate SCV

d.Combustion fuel metered by FMV and servo fuel to
operate IGV and SCV & blade air

  18.Following
takes place during APU starting (APU switch is selected to STAR then ON) except

   a.Fuel shut of valve and air intake door
open

   b.Ignition operate from 0% until 60% rpm

   c.HP fuel shut off valve open at 7% rpm

   d.Starter generator operate before ignition
starts

  19.During APU starting (APU switch is
selected to START then ON)

   a.Fuel shut of valve and air intake door
open

   b.Ignition operate from 0% until 60% rpm

   c.HP fuel shut off valve open at 7% rpm

   d.All
of answerd are correct

  20.What gives the starter generator with the
270 VAC power

   a.APU generator control unit

   b.Starter power unit

   c.Starter
converter uni

   d.Starter generator it seft

  21.Where is the location of the SPU and the
SCU

   a.E1 rack in E/E compartment

   b.E2
rack in E/E compartment

   c.E3 rack in E/E compartment

   d.E6 rack in E/E compartment

  22.The power used to operate the APU starter
priority comes from

   a.115
VAC transfer bus 1

   b.Main battery

   c.Together, 115 VAC bus 1 and main battery

   d.Auxilixry battery

  23.The shut down protection for the APU is
accompanied by the illumination of

   a.MAIN, LOW OIL PRESS, FAULT, or
overspeed LIGHT

   b.LOW
OIL PRESS, FAULT, or OVERSPEED LIGHTS

   c.MAINT light

   d.FAULT or and OVERSPEED light

  24.How is the construction of the APU
combustion on B737 NG

   a.Air inlet section, load compressor, load
compressor and gear box

b.Centrifugal
flow compressor, reverse annular combustion chamber and two stage axial flow
turbines

   c.Compressor can type  combustion chamber and radial inflow turbine

d.Air inlet section, combustion section, load compressor

  25.The APU is installed to the aircraft by

   a.Three mounting ports

   b.Four mounting ports

   c.Three mounting points, two on the right
and one on the left

   d.Three
mounting points, one on the right and two on the left

  26.How is the flow divider operation

   a.The secondary fuel flow to combustion
chamber when fuel pressure above 120 psi

   b.The flow divider solenoid is energized
close on flight level 250

   c.The flow divider solenoid is energized
close during APU starting at low temperature

   d.A,
B and C are thrue

  27.What is the condition when the APU in the
Duct pressurization mode

   a.The APU running and the air
conditioning system operates

   b.The engine start switch is operated

c.The APU
running, Blade air valve open, and no blade air is used by the aircraft system

   d.The APU running and the bleed air valve closed (switch off)

  29.What is APU IGVs

   a.There are 16 vanes driven by one
actuator

   b.The travel is 15 degreases for full
close and 115 degrease for full open

   c.The position is monitored by the ECU
via an LVDT

   d.All
the answerd are correct

  30.What gets the lubrication from the oil
system

   a.Compressor bearing and turbine bearing

   b.Compressor bearing, turbine bearing and
accessory gear box

   c.Compressor
bearing, turbine bearing, accessory gear box and starter generator

   d.Compressor bearing, turbine bearing and
starter generator

  31.The Allied signal 131-9 APU maximum EGT is

   a.760° C

   b.No
operational EGT limitations

   c.Indicated by the red line on the EGT
indicator

  32.Electrical power to start the APU  comes from

   a.The no 1 transfer bus

   b.The main battery always

   c.The
main battery only if no AC power is available

  33.Why do you wait for 20 sec onds to turn
off the battery switch after the APU is shutdown

   a.Because the 60 second cooldown priod is
not long enough

   b.It is the required cooldown priod

   c.To
let the APU inlet door close

  34.If a
malfunction exist causing an automatic shutdown of the APU and the APU switch
is placed to OFF

   a.The fault 7blt remain on

   b.The
fault light extinguish after 5 minutes

   c.the fault light extinguish

  35.The maximum aircraft altitude for
electrical use of the allied signal 131 APU is

   a.37000 fts

   b.35000 fts

   c.41000
fts

  36.The maximum APU N1 RPM is

   a.106%

   b.105%

   c.Indicated by a red line on the DU

  37.The minimum start pressure at 2000 feet
above sea level (prior to starter engagement) is

   a.39 psis

   b.29 psis

   c.No
limit

  38.Of the four
lights located on the APU control panel, which light will not cause an
automatic shutdown of the APU when it illuminate

   a.LOW OIL PRESSURE

   b.LOW
OIL QUANTITY / MAINT

   c.HIGH OIL TEMP / FAULT

   d.OVERSPEED

  39.The APU start cycle may take up to

   a.60 seconds

   b.120
seconds

   c.135 seconds

   d.3 minutes

  40.The APU may be used as pneumatic source up
to

   a.10000 fts

   b.17000
fts

   c.25000 fts

   d.35000 fts

  41.The APU will shut down on the ground if

   a.The
battery switch is placed to OFF

   b.The LOW OIL QUANTITY / MAINT light
illuminate

   c.The fuel LOW PRESSURE light in the main
tank illuminates

   d.All of above are correct

  42.If the APU GEN OFF light fails to
illuminate by the end of  the start cycle

   a.The fault light illuminate

   b.The MAINT light illuminate

   c.The
APU failed a seft test and the overspeed light will ill

   d.There is no light associated with this
malfunction

  43.What purpose does the flow divider have

   a.It opens up for the primary fuel supply

b.It opens up
for the secondary fuel supply when the metered pressure is sufficient

   c.It meters all fuel for combustion

  44.Which component decides whether to used
28VDC or 115VAC for starting

   a.The SPU

   b.The SCU

   c.The ECU

  45.Describe the limitations of the APU power
extrections

   a.Bleed air up to 32000 fts

   b.Bleed
air up to 17000 fts

   c.Bleed air and elect power up to 41000
fts

  46.Which components are hydraulic actuated by
regulated fuel pressure

   a.Inlet door actuator and the IGV
actuator

   b.Bleed air valve and the actuator
control valve

   c.IGV
actuator and surge control valve (SCV)

   d.Bleed air valve (BAV) and IGV actuator

  47.During a
normal S/D the fuel solenoid valve remained open. Which light on the P5 APU
panel illuminates

   a.MAINT light

   b.LOW OIL PRESSURE light

   c.OVERSPEED
light

   d.FAULT light

  48.Which position does the SCV have during
APU starting

   a.Fully
closed

   b.Depends on the bleed mode

   c.Fully open until 95% of the reted speed

   d.It is closed until a bleed mode is
selected

  49.What position does the IGVs have when the
APU BAV is closed

   a.12 to 15 degrees open

   b.115 degrese open

   c.Fully closed (no airflow)

  50.When will the APU ECU be powered

   a.When the APU switch is on

   b.Whenever the battery bus is powered

   c.From
the APU switch is ON until 5 min after shutdown (switch OFF)

  51.Which of the APU lubrication filters are
monitored by the ECU

   a.Both

   b.The pressure filter only

   c.The
scevence filter only