Exam quiz Principles of Flight (Helicopter) - PPL(H) - Private Pilot Licence (Helicopter)

Question 1

Which statement about vortex ring state is correct?

Accepted Answer

It can occur with high rate of descent, low forward speed and power applied.

Answer

It occurs only with the engine stopped.

Answer

It is prevented by increasing collective indefinitely.

Answer

It is a compass turning error.

Question 2

Why does a stall begin on the retreating rotor blade at high cruise speeds?

Accepted Answer

The large pitch angle and relatively low peripheral speed cause a large effective angle of attack

Answer

The airflow reaches subsonic speed and causes an increase of the induced drag

Answer

The small pitch angle and a relatively low peripheral speed cause a small effective angle of attack

Answer

The airflow reaches supersonic speed and causes an increase of the parasite drag

Question 3

What happens to thrust and tangential force if the rotor RPM decreases by about 10 % in cruise flight?

Accepted Answer

The thrust and the tangential force decrease

Answer

The thrust and the tangential force increase

Answer

The thrust decreases and the tangential force remains constant

Answer

The thrust remains constant and the tangential force increases

Question 4

Which action best supports safe management of effective translational lift?

Accepted Answer

Expect performance and attitude changes during acceleration.

Answer

Delay the decision until after take-off.

Answer

Use the item only if requested by passengers.

Answer

Ignore it when the helicopter has sufficient fuel.

Question 5

Which of the stated relationships between lift and drag applies best for a flying helicopter (lift: drag)?

Accepted Answer

45: 1

Answer

1: 45

Answer

1: 2

Answer

2: 1

Question 6

A delta-three hinge is used to allow...

Accepted Answer

For a decreased pitch angle at an upwards flapping blade

Answer

The advancing blade to flap up about the hinge

Answer

The advancing blade to lead about the hinge

Answer

The advancing blade to drag about the hinge

Question 7

Why is anti-torque demand important for a PPL(H) flight?

Accepted Answer

It generally increases as power and torque increase.

Answer

It is relevant only to airline transport operations.

Answer

It can be ignored when the flight remains local.

Answer

It is replaced by passenger preference.

Question 8

Which statement about lift on a rotor blade is correct?

Accepted Answer

It depends on airflow, aerofoil shape, angle of attack and air density.

Answer

It is independent of angle of attack.

Answer

It is produced only by the tail rotor.

Answer

It increases when air density becomes zero.

Question 9

What shall be considered before terminating a turn in an autorotation?

Accepted Answer

The pitch angle must be decreased by using the collective pitch lever again

Answer

The Coriolis force causes an increase in the main rotor rpm

Answer

The decreasing gravity relieves the main rotor and the helicopter cabin

Answer

The flight velocity shall be increased to obtain all the kinetic energy

Question 10

Which statement about rotor RPM decay is correct?

Accepted Answer

It can reduce lift and control margin and must be corrected promptly.

Answer

It increases lift indefinitely.

Answer

It is corrected by raising collective in every case.

Answer

It is unrelated to safety.

Question 11

Which of the following options has an effect on the autorotation characteristics?

Accepted Answer

Helicopter mass and density altitude

Answer

Smoothly working tail rotor control and low RPM warning systems

Answer

Air temperature and wind speed

Answer

Pressure altitude and wind speed

Question 12

The rotor thrust is...

Accepted Answer

Perpendicular to the tip path plane

Answer

Opposite to the rotation of the rotor blade element

Answer

Parallel with the main rotor shaft

Answer

Perpendicular to the hub plane

Question 13

The effective airflow velocity of a rotor blade element varies with the distance from the rotor shaft axis, because the...

Accepted Answer

Peripheral speed increases if the displacement to the rotor blade tip decreases

Answer

Helicopter airframe disturbs the airflow

Answer

Tangential force and airflow reversal vary

Answer

Drag force in direction of the rotation axis is increased

Question 14

The airframe of an accelerating helicopter continues to bend until the...

Accepted Answer

Horizontal thrust component equals the drag

Answer

Thrust passes in front of the centre of gravity

Answer

Vertical thrust component equals the drag

Answer

Thrust passes behind the centre of gravity

Question 15

Which statement about mast bumping is correct?

Accepted Answer

It is a hazard associated with some teetering rotor systems under low-G or abrupt control conditions.

Answer

It is an altimeter calibration method.

Answer

It occurs only after shutdown.

Answer

It is solved by applying rotor brake in flight.

Question 16

Which landing site (no wind) prevents the impairment of the ground effect?

Accepted Answer

Plain terrain

Answer

Narrow forest glade

Answer

Elevated helipad

Answer

Sloping ground

Question 17

Which statement about retreating blade stall is correct?

Accepted Answer

It is associated with high forward speed, high gross mass, turbulence or high density altitude.

Answer

It occurs only while parked.

Answer

It affects only the advancing blade first.

Answer

It is prevented by exceeding VNE.

Question 18

Which statement about torque reaction is correct?

Accepted Answer

The fuselage tends to rotate opposite to main rotor torque unless balanced.

Answer

It is a GPS position error.

Answer

It affects only gliders.

Answer

It is eliminated by changing QNH.

Question 19

Why is disc loading important for a PPL(H) flight?

Accepted Answer

It affects induced velocity and hover power required.

Answer

It is relevant only to airline transport operations.

Answer

It can be ignored when the flight remains local.

Answer

It is replaced by passenger preference.

Question 20

Which statement about cyclic pitch is correct?

Accepted Answer

It tilts the rotor disc to control movement around pitch and roll axes.

Answer

It changes all blade pitch equally.

Answer

It controls fuel flow only.

Answer

It is used only after shutdown.

Question 21

What causes the phase lag between the displacement and the flapping of a rotor blade?

Accepted Answer

Inertia, mass, and aerodynamic forces

Answer

Rounding of the rotor blade tips

Answer

Friction in the rotor blade spindles

Answer

Advance or retreat angle of 90°

Question 22

Vx is the speed...

Accepted Answer

For the best angle of climb

Answer

For the best rate of climb

Answer

To rotate

Answer

Never to be exceeded

Question 23

The rotor RPM is kept constant in the helicopter by the engine RPM. It can be influenced by the...

Accepted Answer

Throttle and the governor

Answer

Cyclic stick

Answer

Starter and the impulse coupling

Answer

Collective

Question 24

What types of airflow can be observed around a rotor blade aerofoil?

Accepted Answer

Laminar airflow at the leading edge, turbulent airflow further back

Answer

Laminar airflow on the entire upper surface

Answer

Turbulent airflow at the leading edge, laminar airflow further back

Answer

Turbulent airflow on the entire upper surface

Question 25

What aerodynamic effect is most relevant? The helicopter accelerates through effective translational lift.

Accepted Answer

less power may be required for the same lift.

Answer

The altimeter setting becomes invalid.

Answer

The magnetic compass becomes the primary lift source.

Answer

The aircraft mass automatically decreases.

Question 26

Which action best supports safe management of blade pitch increase?

Accepted Answer

Monitor rotor RPM and engine limits.

Answer

Delay the decision until after take-off.

Answer

Use the item only if requested by passengers.

Answer

Ignore it when the helicopter has sufficient fuel.

Question 27

What is the correct way to counteract the vortex ring state?

Accepted Answer

Try to gain airspeed and enter autorotation

Answer

Raise collective and decrease rotor RPM

Answer

Raise collective and pull back the stick

Answer

Open throttle and pull back the stick

Question 28

What aerodynamic effect is most relevant? Density altitude increases.

Accepted Answer

rotor thrust and engine performance margins normally decrease.

Answer

The altimeter setting becomes invalid.

Answer

The magnetic compass becomes the primary lift source.

Answer

The aircraft mass automatically decreases.

Question 29

If the critical angle of attack is exceeded, the...

Accepted Answer

Boundary layer on the upper side of the rotor blade begins to separate

Answer

Transition point starts moving towards the airflow direction

Answer

Boundary layer on the lower side of the rotor blade begins to separate

Answer

Laminar boundary layer turns into a turbulent boundary layer

Question 30

Why does a flare during an autorotation generate higher rotor RPM?

Accepted Answer

The vertical airflow through the rotor disc increases

Answer

The pitch angle increases

Answer

The tangential force tilts backwards

Answer

The ground effect leads to better performance

Question 31

Which statement about autorotation is correct?

Accepted Answer

The rotor is driven by upward airflow through the rotor disc after power loss or power reduction.

Answer

The rotor is driven by the starter motor throughout descent.

Answer

The rotor brake is applied in flight.

Answer

Lift is produced only by the tail rotor.

Question 32

What behaviour does a helicopter without stabilization systems show after external disturbances in a hover, without a corrective action?

Accepted Answer

Statically stable and dynamically instable

Answer

Statically stable and dynamically stable

Answer

Statically indifferent and dynamically instable

Answer

Statically stable and dynamically indifferent

Question 33

What is the advantage of a turbulent airflow compared to a laminar airflow at an aerofoil with a high angle of attack?

Accepted Answer

It adheres to the aerofoil for a longer time

Answer

It has a thinner boundary layer

Answer

It has no form drag

Answer

The separation point moves further forward

Question 34

Which ratio corresponds to the rotor disc loading?

Accepted Answer

Helicopter mass / rotor disc

Answer

Rotor disc / helicopter mass

Answer

Rotor thrust / rotor disc

Answer

Rotor disc / rotor thrust

Question 35

What aerodynamic effect is most relevant? Rotor RPM starts to decay in autorotation.

Accepted Answer

collective should be managed to recover RPM.

Answer

The altimeter setting becomes invalid.

Answer

The magnetic compass becomes the primary lift source.

Answer

The aircraft mass automatically decreases.

Question 36

Why do helicopters with a semi-rigid rotor system react slower than others?

Accepted Answer

The central flapping hinge does not transmit any moments

Answer

The missing lag hinges cause a rotor imbalance

Answer

The lowered attachment of the rotor blades allows a transmission of forces

Answer

The angled lag hinges prevent the transmission of aerodynamic forces on the helicopter frame

Question 37

During an autorotation the airspeed is limited by...

Accepted Answer

The drift of the driving forces on the returning blade

Answer

The displacement of the stall regions in the inner area of the rotor blade

Answer

The interference drag during low rates of descent

Answer

The landing gear during the touchdown

Question 38

The neutral point is a point where...

Accepted Answer

The torque at the chord line remains constant for changing angles of attack

Answer

The aerodynamic forces act torque-free

Answer

The imaginary axes of a helicopter meet each other

Answer

The entire helicopter mass can be assumed to attack

Question 39

Which statement about VNE is correct?

Accepted Answer

It is the never-exceed speed and must not be exceeded.

Answer

It is a recommended minimum hover speed.

Answer

It is the same as best endurance speed.

Answer

It applies only to ATC clearances.

Question 40

During an autorotation a helicopter accelerates from 60 to 90 knots without further corrections. The rotor RPM will...

Accepted Answer

Decrease.

Answer

Remain constant.

Answer

Vary.

Answer

Increase.

Question 41

The maximum range in an autorotation will be achieved by...

Accepted Answer

A relatively high effective angle of attack.

Answer

A relatively low effective angle of attack.

Answer

A neutral effective angle of attack.

Answer

A negative effective angle of attack.

Question 42

Why is hover ceiling important for a PPL(H) flight?

Accepted Answer

It depends on mass, density altitude, wind and power available.

Answer

It is relevant only to airline transport operations.

Answer

It can be ignored when the flight remains local.

Answer

It is replaced by passenger preference.

Question 43

Which action best supports safe management of hover ceiling?

Accepted Answer

Check performance data before operating near limits.

Answer

Delay the decision until after take-off.

Answer

Use the item only if requested by passengers.

Answer

Ignore it when the helicopter has sufficient fuel.

Question 44

What is the usual trade-off when helicopter stability is increased?

Accepted Answer

Reduced manoeuvrability and controllability.

Answer

A decrease in general aviation safety.

Answer

An increase in maximum permitted helicopter mass.

Answer

Improved control under negative load factors.

Question 45

After entering an autorotation a large helicopter mass leads to...

Accepted Answer

A rapid build-up of the rotor RPM

Answer

A rapid collapse of the rotor RPM

Answer

A large change in centre of gravity

Answer

A small rate of descent in a vertical autorotation

Question 46

The pitch angle of a tail rotor blade is changed...

Accepted Answer

Collectively

Answer

Cyclically

Answer

Symmetrically

Answer

Asymmetrically

Question 47

Why is effective translational lift important for a PPL(H) flight?

Accepted Answer

It improves rotor efficiency as airflow becomes more horizontal and less recirculated.

Answer

It is relevant only to airline transport operations.

Answer

It can be ignored when the flight remains local.

Answer

It is replaced by passenger preference.

Question 48

Which statement about profile drag is correct?

Accepted Answer

It is associated with the rotor blade moving through the air.

Answer

It is caused only by radio antennas.

Answer

It disappears when blade pitch increases.

Answer

It is unrelated to rotor speed.

Question 49

Which statement about the rotor disc loading in a horizontal curve is correct?

Accepted Answer

It increases with increasing bank angle

Answer

It decreases with increasing bank angle

Answer

No change in relation to the cruise flight

Answer

Effects depend on the type of helicopter

Question 50

What aerodynamic effect is most relevant? The helicopter enters a steep flare in autorotation.

Accepted Answer

rotor RPM may increase and must be controlled.

Answer

The altimeter setting becomes invalid.

Answer

The magnetic compass becomes the primary lift source.

Answer

The aircraft mass automatically decreases.

Question 51

Which statement about coning is correct?

Accepted Answer

It is the upward bending of rotor blades due to lift and centrifugal force balance.

Answer

It is a radio navigation procedure.

Answer

It is caused by altimeter error.

Answer

It is the same as tail rotor drift.

Question 52

What is the reason for retreating blade stall?

Accepted Answer

Large pitch angle and small effective airflow

Answer

Large centrifugal forces of the peripheral speed

Answer

Small cone angle and constant peripheral speed

Answer

Small pitch angle and large effective airflow

Question 53

Which action best supports safe management of stall region in autorotation?

Accepted Answer

Avoid excessive collective that expands the stall region.

Answer

Delay the decision until after take-off.

Answer

Use the item only if requested by passengers.

Answer

Ignore it when the helicopter has sufficient fuel.

Question 54

Which movement is caused by the Coriolis effect on the advancing rotor blade?

Accepted Answer

Drag movement forwards

Answer

Mass movement outwards

Answer

Tilt movement backwards

Answer

Flapping downwards

Question 55

What aerodynamic effect is most relevant? A strong left crosswind affects a helicopter susceptible to LTE.

Accepted Answer

yaw control margin may be reduced.

Answer

The altimeter setting becomes invalid.

Answer

The magnetic compass becomes the primary lift source.

Answer

The aircraft mass automatically decreases.

Question 56

What can be expected during a hover flight in ground effect within a forest glade?

Accepted Answer

Recirculation of air masses and an impairment of the ground effect

Answer

Useful ground effect caused by a smaller induced airflow

Answer

No air turbulence through the slipstream and stable attitude

Answer

Aspiration of the tail rotor in the direction of the forest and a performance gain

Question 57

What is the main safety effect of increased stability in a helicopter?

Accepted Answer

It improves general flight safety.

Answer

It increases the maximum permitted helicopter mass.

Answer

It improves control under negative load factors.

Answer

It always reduces the required control forces.

Question 58

Which action best supports safe management of anti-torque demand?

Accepted Answer

Anticipate pedal input when changing collective.

Answer

Delay the decision until after take-off.

Answer

Use the item only if requested by passengers.

Answer

Ignore it when the helicopter has sufficient fuel.

Question 59

The rotor blade shape takes effect on the...

Accepted Answer

Lift distribution

Answer

Rotor head used

Answer

Notch sensitivity

Answer

Structural take-off mass

Question 60

What is the reason for the driving forces in an autorotation?

Accepted Answer

Downward tilted effective airflow

Answer

Low rate of descent

Answer

Increased pitch angle

Answer

High airspeeds

Question 61

The transitional lift can be noticed by...

Accepted Answer

Vibrations.

Answer

An aural warning.

Answer

Strong load factors.

Answer

A loss of engine rpm.

Question 62

Without corrective moves, a helicopter hovering in ground effect in no-wind conditions, will execute...

Accepted Answer

Slight upward and downward movements

Answer

Pitching motion about the centre

Answer

Fast yaw motions

Answer

Rolling movements to about 60°

Question 63

What kind of drag is caused by a lift-producing aerofoil?

Accepted Answer

Induced drag

Answer

Parasite drag

Answer

Frictional drag

Answer

Interference drag

Question 64

Which statement about blade flapping is correct?

Accepted Answer

It helps compensate for dissymmetry of lift.

Answer

It prevents all rotor RPM changes.

Answer

It is used only for braking after shutdown.

Answer

It is unrelated to forward flight.

Exam simulation Principles of Flight (Helicopter) - PPL(H) - Private Pilot Licence (Helicopter)

Exam simulation PPL(H) Helicopter Theory Exam Questions in English Principles of Flight (Helicopter) 120 questions on 120 minutes

Exam simulation Principles of Flight (Helicopter) - PPL(H) - Private Pilot Licence (Helicopter)

Exam simulation PPL(H) Helicopter Theory Exam Questions in English Principles of Flight (Helicopter) 120 questions on 120 minutes

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