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In a FADEC system, active control switchover occurs
- on shutdown.
- when channels A and B are healthy.
- on engine startup only.
I think the correct answer is ON SHUTDOWN.
I found the below explanation from a different site.
On the CF6 FADEC, each startup uses an alternative channel.But the switch-over occurs on shutdown of the previous run.The reason for this is that the switch-over at start up might interrupt the start-up sequence.
What is the pressure increase over one stage of a centrifugal compressor?
- 5:1
- 1.2:1
- 8:1
I think the answer is 8:1 because Jeppesen Gas Turbine Powerplant quotes the latest modern centrifugal compressor as having a pressure ratio of 10:1
An autotransformer is
- primary and secondary coils.
- primary coil only.
- primary and secondary coils on single bar.
Why
Mandatory markings for flight instruments, or placards are annotated in the
- Aircraft Maintenance Schedule.
- Flight manual or Certificate of Airworthiness.
- Aircraft Maintenance Manual.
Are in maintenance manual ATA 11 "PLACARDS AND MARKINGS", or not?
When is a Noise Certificate required to be carried aboard the aircraft?
- At all times.
- When flying in UK airspace only.
- When flying in UK or any EU member state airspace.
Why not at all times?
A transformer should always have its
- primary shorted or off load.
- secondary shorted or on load.
- secondary open circuit or on load.
Shouldn't it be secondary shorted or on load?
In a CRT, if the magnetic field is parallel to the Y plates, what will be the direction of the electron beam movement?
- Diagonal.
- Vertical.
- Reversed.
if the magnetic field is parallel to the Y axis why the movement of the beam is not horizontal? i know that the beam have to move in a direction that's perpendicular to the magnetic force lines...is it wrong?
An increase in operating temperature in most electrical devices carrying current results in
- a decrease in resistance and an increase in current.
- no effect on the resistance and current.
- an increase in resistance and a decrease in current.
isnt R inversly proprtion to Temp? Help
The poles of a DC generator are laminated to
- reduce eddy current losses.
- reduce flux losses.
- reduce hysteresis losses.
isnt it eddy current?? Help
A perforated ear drum could occur if
- you were exposed to intermittent noise above 25 kHz.
- you frequently blew your nose with excessive force.
- you were subjected to continuous noise below 8 kHz.
isnt it normal for 20Hz to 20 Khz?? confused. please clearify
Thrust and camber faces of a propeller should be blended out to
- 5 times the depth of damage.
- 10 times to the depth of damage.
- 30 times to the depth of damage.
why 30, is not 10?
The most significant effect of stone chips on a propeller is
- thrust output of the propeller.
- structural integrity of the propeller.
- aerodynamic capability of the propeller.
what is stone chips?
What polarity do interpoles take in a DC motor?
- Either, provided they lay on the MNA.
- The same as the next main pole ahead in the direction of rotation.
- The same as the next main pole behind in the direction of rotation.
Can someone explain this?
If y/x = 4 and y = 5 then x =
- 4/5.
- 1 1/4.
- 20.
y/x=4, x=4y when y=5 x=20.
Stalling speed in a 15 degrees bank level turn is 60kt. The stalling speed in a 45 degrees bank level turn will be
- 70 kts.
- 60 kts.
- 50 kts.
How do I calculate stalling speed? Please any help will do thanks
A body drops from 10m, it will hit the ground in
- square_root(5 seconds).
- square_root(4 seconds).
- square_root(2 seconds).
What formula is used for this?
A 10:1 step up power transformer has 120 V, and 3A flowing through the primary, and 0.285 A flowing through the secondary what is the efficiency?
- 90%.
- 95%.
- 85%.
can somebody pls explain that with a formula
The Lowest Common Denominator for the problem below is 1/6 + 1/5 + 1/17 + 1/2.
- 510.
- 1020.
- 17.
can anyone show me a quick way to work this out
A conductor with a positive Q (charge) of 4C has 12.56 x 1018 electrons added to it. It will have a Q =
- 6.
- 2.
- 0.
help?
If a capacitor 1uF and an inductor 10mH are connected in parallel what is their approximate resonant frequency?
- 1.6 kHz.
- 62 Hz.
- 3.2 MHz.
help?
Three inductors 10 mH, 5 mH and 20 mH are connected in parallel. What is the total inductance?
- Without knowing the coupling factor the total inductance cannot be found.
- 2.86mH.
- 1.35mH.
help?
In a 4:1 step-up transformer, 120V is applied to the primary, and the load on the secondary is 1600 Ohms. What is the current in the primary?
- 0.075A
- 1.2A
- 3A
help?
A 24V battery has an internal resistance of 1 ohm. When connected to a load, 12 amps flows. The value of the load is
- 12 ohms.
- 1/2 ohm.
- 1 ohm.
help?
Aircraft components require overhauls at times stated in the
- maintenance schedule.
- overhaul manual.
- maintenance manual.
Shouldn't it be maintenance schedule since it deals with timings while the manual has maintenance procedures?
The mark-to-space ratio of the waveform shown is
- A to D / D to E.
- D to E / D to C.
- A to B / B to C.
Please explain this one, I don't understand, thank you.