Apu engine run
APU Engine Run Quiz
Test your knowledge on APU engine operations and maintenance with our comprehensive quiz! This quiz is designed for anyone looking to enhance their understanding of APU systems, covering essential topics and procedures.
Key features:
- 41 carefully crafted questions
- Multiple choice and checkbox formats
- Suitable for technicians and students alike
Loss of oil pressure for ___________ will automatically shut the engine down.
5 to 10 seconds
10 to 15 seconds
5 to 14 seconds
8 to 12 seconds
When performing static check out of engine control a 5 ohm, _____ watt resistor is required?
50
40
20
40
During the automatic start check, what is the maximum start time with454 c bleed load on?
40 seconds
24 seconds
60 seconds
42 seconds
The starter duty cycle application for successful starts is six consecutive start attempts at what intervals?
20 minutes
10 minutes
5 minutes
15 minutes
After three unsuccessful start attempts, what is the minimum of time required?
15 minutes
10 minutes
30 minutes
20 minutes
During the static checkout of the APU control system, if the REF cell battery meter is in the red, what should you do?
Unit is self-charging, check again after 5 minutes
Nothing, it is a normal condition
Push the CB in and reset the set master switch
Replace the electrical battery
During the automatic start check, what is the maximum start time with the cap removed?
40 seconds
24 seconds
42 seconds
60 seconds
How long must the APU run to stabilize during the bleed load check?
5 minutes
15 minutes
10 minutes
3 minutes
What sections make up the apu?
Inlet, exhaust, and fuel
Gearbox, turbine, and exhaust
Gearbox, compressor, and turbine
Intlet, gearbox, compressor
During the static simulated speed check, when will the start relay light extinguish?
At 60%
Between 58-62%
Between 55-60%
At 55%
During a start attempt, when do you release the start switch?
65%
70%
When start release light goes out
60%
When is fuel leakage allowed from the plenum drain?
Only during engine shutdown
Steady state operation, but not exceeding 3cc per hour
Permitted only after a false start or blowout
Steady state operation, but not exceeding 5cc per hour
The ECU receives a signal from the low oil pressure switch and shuts down the APU when pressure drops to _____ minimum.
31 PSI
20 PSI
25 PSI
40 PSI
While motoring the engine to bleed air from the fuel control, you must observe the
Fuel from the drain hose for air
Fuel Sol. Light for "on" indication
RPM indicator
Oil pressure indicator for oil pressure
What temperature differential may be between the exhaust temp indicator on the test stand control panel and the temp indicator on the tester panel assy.?
10 degrees C
5 degrees F
2 degrees C
5 degrees C
When accomplishing the inhibit switch test, VDC reading should you get for the load valve?
26-28
20-28
18-28
20-30
When accomplishing the inhibit switch test, what VDC reading should you get for the start relay?
18-28
20-30
20-28
26-28
What is the maximum EGT limit for 30 seconds and under 60% RPM?
704 C
871 C
982 C
1300 C
Indication of an overspeed will occur between 106% to
113%
110%
112%
115%
Observed oil pressure on the oil pressure indicator shall read what?
35-45 PSI
35-60 PSI
35-55 PSI
40-55 PSI
The oil pressure-regulating valve regulates oil pressure from ____ to _____ psig
10/70
40/70
20/80
35/55
At what % RPM does the bleed air system load control valve switch become armed?
10%
60%
100%
95%
During an operational check of an APU, at 8-12% RPM indicated on the RPM indicator, what lights will illuminate?
Start relay light, APU fuel sol, Ignition unit
Ignition unit, LOP light, Run light
A/C fuel sol, run light, APU fuel sol
A/C fuel sol, APU fuel sol, Ignition unit
When priming the fuel system, what should the speed indicator be turned to?
It should not be turned
Until the APU FUEL SOL light illuminates
60% RPM
8-12% RPM
At 95%, as indicated on RPM indicator, which lights extinguish?
Load valve, LOP light
Ignition light, LOP light
Overcurrent light, LOP light
Start Relay light, LOP light
A_______ period should be observed after the temperature stabilizes before shutting down the engine.
30 seconds
60 seconds
2 minutes
5 minutes
During the static simulated speed check, what lights should illuminate when the speed dial indicator reads 93-97% RPM?
Load Valve
Start Relay
A/C Fuel sol, APU Fuel sol, and Ignition unit
Overspeed & Shutdown
What should be monitored throughout the operational check?
RPM indicator
All indicators
EGT indicator
Oil pressure indicator
At what % RPM will the ignition start and stop firing?
10/95
10/60
10/80
15/95
What is the minimum number of qualified personnel required to perform an engine test?
2
4
1
3
When priming or preserving the fuel system, what 2 buttons do you push down on?
A/C Fuel sol & start relay
APU Fuel sol & start relay
A/C Fuel sol & APU Fuel sol
LOP sw & start relay
What is the maximum EGT limit for 2 seconds and under 60%?
705 c
1300 f
982 c
871 c
What is the maximum time for an APU ( with TCTO modification 2G-GTCP36-505) start with ambient temperature above 20 F?
120 seconds
24 seconds
90 seconds
45 seconds
During the static simulator speed check with speed simulator dial set at 0., what lights shall illuminate?
Ignition unit light
Start relay light
Run light
Run light & start relay light
Speed and turbine discharge temperature are automatically regulated by the metering of
Fuel
Oil
Exhaust
Airflow
Whenever practical, operation of the engine shall be planned in advance to allow for a ________ warm up period at governed speed prior to loading.
60 seconds
3 minutes
5 minutes
3-5 minutes
Before a functional check of an APU, you should ensure the electrical shutoff valve is
Removed for the test stand
Fully closed
Opened at a 45 degree angle
Fully open
What is the maximum oil temperature?
65 C
200 F
135 F
135 C
When the stop switch is pressed, the shutdown indicator light illuminates along with which light?
Overspeed light & Overcurrent light
Overcurrent light
Overcurrent Light & LOP light
Overspeed Light
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