12. Helicopter aerodynamics, structures and systems - Q&A
22 questions found
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If the pitot and static pipe lines were cross connected at the instrument panel connection, application of pressure to the pitot head would cause the
- altimeter reading to increase, vertical speed indicator to indicate descent.
- altimeter reading to decrease, vertical speed indicator to indicate descent.
- altimeter reading to decrease, vertical speed indicator to indicate climb.
why?
When the rotor blade increases its angle of attack, the centre of pressure
- does not move.
- moves rearwards.
- moves forward.
Centre of pressure moves forward when AOA is increased?
The main rotor head hydraulic damper beam has been over tensioned. This would cause
- too much stability and over sensitive controls.
- too much stability and less sensitive controls.
- instability and over sensitive controls.
why?
The coning angle of the rotor blades is the angle between
- the horizontal and the rotor blades.
- the rotor blades and the tip path plane.
- the normal axis and the rotor blades.
I think this is also wrong.It should be horizontal plane and tip oath od the blades.
Solidity of the rotor is the ratio of the
- blade area to disc area.
- all up weight to blade area.
- all up weight to disc area.
This question has a 100% wrong answer.It should be the opposite .The correct term is solidity=disk area/blade area.
A redundant structure is
- on-condition structure.
- a safe-life structure.
- a failsafe structure.
why not safe life?
In straight and level flight, the forward air speed is controlled by the
- cyclic stick and the throttle.
- the cyclic stick and the collective lever.
- collective lever and the throttle.
Shouldn't it be collective with throttle?
A cold air unit allows for cabin temperatures to be
- a little more than ambient air temperature.
- lower than ambient air temperature despite compression heating.
- same as ambient temperature, despite compression heating.
why not lower?It says cold air unit.
A pneumatic indicator takes its indications from
- compressor inlet.
- reservoir.
- compressor outlet.
we are talking abuot pleumatic what it has to do with reservoir?Shouldt it be compressor inlet or outlet?
Compressibility error in a pitot head is caused by
- misalignment of pitot head.
- blockage in the pitot tube.
- compression of air in the tube at high speed.
shouldnt it be blockage or misalignment?
What does a Decca Navigation system operate on?
- Very High Frequency.
- High Frequency.
- Low Frequency.
where is this question from? I have seen some questions and they are not from the pdf .
Which part of the rotor disc produces the most lift during forward flight?
- The mid-span portion.
- The front portion.
- The rear portion.
Is the answer correct?
On a helicopter, what is vortex ring state?
- Tip vortex build-up during hover.
- Tip vortex interference at high forward speed.
- Ground vortex interference when hovering close to the ground.
please explain the answer
The intermediate gearbox is
- an epicyclic gearbox.
- a bevel gearbox.
- a reduction gearbox.
It's a bevel gearbox
The stalling speed of an helicopter blade
- does not change.
- is increased when the helicopter is heavier.
- is increased when the helicopter is lighter.
Blade stall is more likely when the HC is heavier. Does that not mean that the stalling speed of the blade is increased when the HC is lighter and will stall at a lower speed when the HC is heavier? Just getting ready for my A3 and this is confusing me!
Lift generated by a blade is proportional to the
- relative airflow and the angle of attack.
- aircraft airspeed and angle of attack.
- relative airflow and the pitch.
lift generated by a blade is proportional to relative airflow & the airspeed as mentioned in this question.
Can anybody throw light on this ?
A cargo compartment in which there is a separate approved smoke or fire detector system to give warning and means to shut off the ventilating airflow to the compartment is a
- Class 'E' compartment.
- Class 'C' compartment.
- Both.
THIS QUESTION HAS 2 ANSWERS CLASS 'C' AND CLASS 'E'
A helicopter is hovering and the pilot applies right pedal. Assuming the main rotor rotates anti clockwise viewed from above, the helicopter will
- descend, unless the pilot applies more collective pitch.
- descend, unless the pilot inches the throttle open.
- ascend, unless the pilot decreases rotor RPM.
isn't that wrong?
With an increase in forward velocity of a helicopter, the increase in parasitic drag will cause the fuselage attitude to
- pitch down.
- remain level.
- pitch up.
Can some body explain this to me or give me a reference?thank you.
What is the advancing blade on a helicopter doing?
- Going to the highest point.
- Increasing in lift.
- Increasing in drag.
please tell me answer
How do the rotors turn on a co-axial rotor system?
- They counter-rotate on a common shaft.
- Both rotate in the same direction on a common shaft.
- They counter-rotate on separate shafts.
Ithink they counter rotates on seprate shafts
A helicopter tail rotor is fitted to
- counteract engine torque and provide a rapid turn facility.
- counteract main rotor torque and provide normal directional control.
- permit directional control.
Please write your comment here.may be it is to counter main rotor torque and not engine torque ans ist seems more appropriate