11. Aeroplane aerodynamics, structures and systems - Q&A
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On large aircraft, braked wheel assemblies are normally inflated with
- nitrogen.
- nitrogen and not more than 5% of air.
- an argon and CO2 mixture.
ONE ANSWER IS ONLY NITROGEN AND ANOTHER SAYS
nitrogen and not more than 5% of air. WHICH ONE IS CORRECT?
A compass has a residual deviation of +1 degree. To fly a heading of 180 degrees the pilot must steer
- 181 degrees.
- 180 degrees.
- 179 degrees.
To compensate the +1 degree error, the pilot must fly 181 degrees if he wants to head 180 degrees.
The deflection of the ADI command bars when flying a localiser approach is proportional to
- the difference between the amplitudes on the two modulations.
- the difference in amplitude of the two r.f. carriers.
- the sum of the amplitude of the two modulations.
please explain
Mach trim operates
- along the longitudinal axis
- along the lateral axis
- to reduce Dutch roll
Please explain
What colour is the strobe light on the PORT wing?
- White.
- Green.
- Red.
Please write your question here.
What colour is the strobe light on the PORT wing?
- White.
- Green.
- Red.
Port means left in naval terms, so with that said, ain't it Red?
An aeroplane flying above the Critical Mach No. will usually experience
- an oscillation in pitch
- a nose up pitch
- a nose down pitch
Ain't the oscillation a more logical answer?
With an increase in the amount of flap deployment, the stalling angle of a wing
- increases.
- remains the same.
- decreases.
Please why is it not decrease,,,?
flap deploy -> flap stall speed decrease -> stall AOA also decrease..?
Millibar is used to express what kind of pressure?
- Pitot pressure.
- Ambient pressure.
- Barometric pressure.
Why does not millibar express barometric pressure?
Component P affects
- coefficient B.
- coefficient A.
- coefficient C.
Please tell me what is it,,
Which part of the wing of a swept - wing aircraft stalls first?
- Both stall together.
- Root stalls first.
- Tip stalls first.
why tip? In swept-wing aircraft, the airflow partially moves toward the wingtip (the "spanwise flow" effect), causing a different lift distribution compared to straight wings. To avoid stability and controllability issues during a stall, the aerodynamic design is often optimized so that the wing root stalls before the tip.
The number of different radials provided by a ground station is
- infinite.
- 180 per quadrant, i.e. 720 in 360 degrees .
- 360.
How the radials can be infinte, they should be 360...
A 4:1 step-up transformer receives 120VAC in its primary and has 1600 Ohms resistance in its secondary. What is the current drawn from the source?
- 3 A.
- 1.2 A.
- 0.3 A.
Why 1.2? I think it's 0.3(480/1600)
The call system for the captain will have the audio signal of a
- hi tone chime.
- horn.
- two tone chrime.
Is this aircraft system dependent/specific or it is standard across all aircraft
A diode connected across a coil will
- prevent the coil being fitted the wrong way.
- prevent back EMF and allow faster switching.
- suppress arcing when relay is opening and closing.
I think "prevent back EMF and allow faster switching" is the correct answer
A battery in situ on an aircraft
- charges at a fairly constant rate because generator voltage remains constant.
- may charged at an excessive rate if initial battery voltage is low.
- may charge slowly if initial battery voltage is low.
What is meant by "situ"?
American made crew oxygen cylinders are
- green in colour with a LH thread.
- green in colour with a RH thread.
- black in colour with a RH thread.
Charging connection has left hand threads, this question needs clarification.
An aircraft flying below the tropopause descends at a constant True Airspeed. Its Mach. No. will
- not change.
- increase.
- decrease.
True airspeed/speed of sound = mach number. So if descending below tropopause doesn’t it mean that Mach number will increase at constant aircraft airspeed? Since the temperature will rise?
Or I am getting it wrong?
What is a controlling factor of turbulence and skin friction?
- Aspect ratio.
- Fineness ratio.
- Countersunk rivets used on skin exterior.
i would argue the correct answer is:
Countersunk rivets used on skin exterior.
The function of the oil in a shock absorber is to
- absorb the landing shock.
- ensure the separator does not bottom.
- damp the rebound.
i would say that the shock absorber has the role of absorbing the shock(ergo the name), at the same time, oil being uncompressible would rather damp the rebound allowed by the nitrogen in the strut.
Compared with the flap up configuration the maximum angle of attack for the flaps down configuration is
- unchanged.
- larger.
- smaller.
in Cl/aoa graphics, flaps-down line remains upwards parallel. so, why the answer is not unchanged?
A radial is referenced
- from a beacon.
- to a VOR.
- on a compass.
radial is for VOR and bearing for beacon. right?
111.1 MHz is
- a VOR frequency.
- a HF frequency.
- an ILS frequency.
IT has even hundreds... S-o why îs not a VOR freq?
Excessive wear on both sides of the control cable pulley groove is evidence of
- pulley misalignment.
- excessive cable tension.
- cable misalignment.
Please write your question here.
Which instrument are most likely to damage if you have a rapid drop in pressure, when carrying out a pitot-static leak check?
- Air speed indicator.
- Altimeter.
- Vertical speed indicator.
Can you please explain why its not altimeter ?