Exam quiz Principle of Flight - EASA PPL(A) - Private Pilot License

Question 1

With regard to flaps, which of the following options provides a lift-increasing effect?

Accepted Answer

Increasing the aerofoil camber

Answer

With regard to flaps, which of the following options provides a lift-increasing effect?

Answer

Decreasing the form drag

Answer

Lowering the induced drag

Question 2

The center of pressure is the theoretical point of origin of...

Accepted Answer

All aerodynamic forces of the profile

Answer

Only the resulting total drag.

Answer

Gravity forces of the profile

Answer

Gravity and aerodynamic forces

Question 3

Provided that no other procedure is described in the Aircraft Operating Handbook, after increasing the engine power in a go-around, the flaps may...

Accepted Answer

Be retracted to a middle position

Answer

Not be operated up to the minimum safe altitude

Answer

Be fully retracted without any delay.

Answer

Remain fully extended until reaching the traffic pattern

Question 4

What is the principle of a Fowler flap?

Accepted Answer

A profile-like flap is extended from the trailing edge of the wing

Answer

A flap from the rear bottom side of the wing is folded down

Answer

At high angles of attack a part of the leading edge lifts

Answer

At high angles of attack a part of the leading edge lifts

Question 5

During a descent at idle power with constant speed, the propeller lever is moved backwards. How do the propeller pitch and sink rate change?

Accepted Answer

Propeller pitch is increased, sink rate is decreased

Answer

Propeller pitch is increased, sink rate is increased

Answer

Propeller pitch is decreased, sink rate is increased

Answer

Propeller pitch is decreased, sink rate is decreased

Question 6

During a straight and steady climb, which force acts addionally, and in the same direction as the drag force, resulting in more power required for climb than for horizontal flight?

Accepted Answer

A component of the weight force along the rearward flight path

Answer

The vertical component of the weight force

Answer

A component of the thrust along the rearward flightpath.

Answer

A component of the lift force along the forward flightpath.

Question 7

In order to improve the stall characteristics of an aircraft, the wing is twisted outwards (the angle of incidence varies spanwise). This is known as...

Accepted Answer

Geometric washout

Answer

Aerodynamic washout

Answer

Arrow shape

Answer

V-form.

Question 8

The static pressure of gases work...

Accepted Answer

In all directions.

Answer

Only vertical to the flow direction.

Answer

Only in the direction of the total pressure.

Answer

Only in flow direction

Question 9

What pressure pattern can be observed at a lift-generating wing profile at positive angle of attack?

Accepted Answer

Low pressure is created above, higher pressure below the profile

Answer

High pressure is created above, lower pressure below the profile

Answer

Pressure above remains unchanged, higher pressure is created below the profile

Answer

Pressure below remains unchanged, lower pressure is created above the profile

Question 10

The position of the the center of pressure at a positively shaped profile...

Accepted Answer

Moves to the trailing edge while the angle of attack becomes smaller.

Answer

Moves to the leading edge while the angle of attack becomes smaller.

Answer

Is located at approximately 25% of the chord, measured from the leading edge

Answer

Does not move since it is independent of the angle of attack.

Question 11

In case of a stall it is important to...

Accepted Answer

Decrease the angle of attack and increase the speed

Answer

Increase the bank angle and reduce the speed

Answer

Increase the angle of attack and increase the speed.

Answer

Increase the angle of attack and reduce the speed.

Question 12

In a co-ordinated turn, how is the relation between the load factor (n) and the stall speed (Vs)?

Accepted Answer

N is greater than 1, Vs is greater than in straight and level flight.

Answer

N is smaller than 1, Vs is greater than in straight and level flight

Answer

N is smaller than 1, Vs is smaller than in straight and level flight.

Answer

N is greater than 1, Vs is smaller than in straight and level flight

Question 13

Wing tip vortex development begins during which phase of flight?

Accepted Answer

When lift is being generated during rotation

Answer

As soon as the aircraft starts moving

Answer

While setting take-off power during take-off run

Answer

While setting flaps to lower position

Question 14

Which point on the aerofoil is represented by number 3? See figure (PFA-009) (1,00 P.) Siehe Anlage 2

Accepted Answer

Transition point

Answer

Separation point

Answer

Center of pressure

Answer

Stagnation point

Question 15

Which statement about the airflow around an aerofoil is correct if the angle of attack decreases?

Accepted Answer

The center of pressure moves aft

Answer

The stagnation point remains constant

Answer

The stagnation point moves down

Answer

The center of pressure moves forward

Question 16

When increasing the airflow speed by a factor of 2 while keeping all other parameters constant, how does the parasite drag change approximately?

Accepted Answer

It increases by a factor of 4

Answer

It decreases by a factor of 2

Answer

It increases by a factor of 2

Answer

It decreases by a factor of 4

Question 17

Which option states a benefit of wing washout?

Accepted Answer

At high angles of attack the effectiveness of the aileron is retained as long as possible

Answer

Structurally the wing is made more rigid against rotation

Answer

With the washout the form drag reduces at high speeds

Answer

Greater hardness because the wing can withstand more torsion forces

Question 18

Pressure drag, interference drag and friction drag belong to the group of the...

Accepted Answer

Parasite drag.

Answer

Induced drag

Answer

Main resistance

Answer

Total drag

Question 19

Which constructive feature is shown in the figure? See figure (PFA-006) L: Lift (1,00 P.) Siehe Anlage 4

Accepted Answer

Lateral stability by wing dihedral

Answer

Longitudinal stability by wing dihedral

Answer

Differential aileron deflection

Answer

Directional stability by lift generation

Question 20

How should the pilot react to an engaged stall warning?

Accepted Answer

Push the elevator, increase power

Answer

Pull the elevator, increase power

Answer

Pull the elevator, decrease power

Answer

Raise the nose to decrease airspeed

Question 21

Which curve represents the induced drag? See Appendix (PFA-011)

Accepted Answer

1

Answer

4

Answer

2

Answer

3

Question 22

How is the balance of forces affected during a turn?

Accepted Answer

Lift force must be increased to compensate for the sum of centrifugal and gravitational force

Answer

The net force results from superposition of gravity and centripetal forces

Answer

The horizontal component of the lift force during a turn is the centrifugal force

Answer

A lower lift force compensates for a lower net force as compared to level flight

Question 23

The elevator moves an aeroplane around the...

Accepted Answer

Lateral axis.

Answer

Elevator axis.

Answer

Longitudinal axis

Answer

Vertical axis.

Question 24

In which way does the position of the center of pressure move at a positively shaped profile with increasing angle of attack?

Accepted Answer

It moves forward until reaching the critical angle of attack

Answer

It moves backward until reaching the critical angle of attack

Answer

It moves forward first, then backward

Answer

It moves to the wing tips

Question 25

In straight and level flight with constant performance of the engine, the angle of attack at the wing is...

Accepted Answer

Smaller than in a climb

Answer

Greater than in a climb.

Answer

Greater than at take-off

Answer

Smaller than in a descent

Question 26

The right aileron deflects upwards, the left downwards. How does the aircraft react?

Accepted Answer

Rolling to the right, yawing to the left

Answer

Rolling to the left, no yawing

Answer

Rolling to the right, yawing to the right

Answer

Rolling to the left, yawing to the right

Question 27

Which statement concerning the angle of attack is correct?

Accepted Answer

A too large angle of attack may result in a loss of lift

Answer

The angle of attack cannot be negative

Answer

Increasing the angle of attack results in decreasing lift

Answer

The angle of attack is constant throughout the flight

Question 28

How do lift and drag change when approaching a stall condition?

Accepted Answer

Lift decreases and drag increases

Answer

Lift and drag decrease

Answer

Lift and drag increase

Answer

Lift increases and drag decreases

Question 29

Rudder deflections result in a turn of the aeroplane around the...

Accepted Answer

Vertical axis.

Answer

Rudder axis

Answer

Lateral axis

Answer

Longitudinal axis.

Question 30

Which statement about the airflow around an aerofoil is correct if the angle of attack increases?

Accepted Answer

The stagnation point moves down

Answer

The center of pressure moves down

Answer

The center of pressure moves up

Answer

The stagnation point moves up

Question 31

Number 3 in the drawing corresponds to the... See figure (PFA-010) (1,00 P.) Siehe Anlage 1

Accepted Answer

Camber line

Answer

Chord

Answer

Thickness

Answer

Chord line.

Question 32

The change in pitch at a propeller blade from the root to the tip ensures...

Accepted Answer

A nearly constant load by a constant effective angle of attack over the entire length of the blade.

Answer

That the most thrust is produced at the blade tip

Answer

That the most thrust is produced at the blade root

Answer

The largest possible angle of attack at the blade tip

Question 33

What structural item provides directional stability to an airplane?

Accepted Answer

Large vertical tail

Answer

Differential aileron deflection

Answer

Wing dihedral

Answer

Large elevator

Question 34

Differential aileron deflection is used to...

Accepted Answer

Keep the adverse yaw low

Answer

Avoid a stall at low angles of attack

Answer

Increase the rate of descent

Answer

Reduce wake turbulence.

Question 35

A take-off with flaps in take-off position causes...

Accepted Answer

A shortening of the take-off run.

Answer

An increased rate of climb

Answer

An increased acceleration

Answer

A decrease in drag.

Question 36

"Longitudinal stability" is referred to as stability around which axis?

Accepted Answer

Lateral axis

Answer

Propeller axis

Answer

Vertical axis

Answer

Longitudinal axis

Question 37

The critical angle of attack...

Accepted Answer

Is independent of the weight.

Answer

Changes with increasing weight.

Answer

Decreases with forward center of gravity position

Answer

Increases with backward center of gravity position.

Question 38

What describes "wing loading"?

Accepted Answer

Weight per wing area

Answer

Drag per wing area

Answer

Drag per weight

Answer

Wing area per weight

Question 39

What leads to a decreased stall speed Vs (IAS)?

Accepted Answer

Decreasing weight

Answer

Lower altitude

Answer

Lower density

Answer

Higher load factor

Question 40

The stall warning will be activated just before reaching which speed?

Accepted Answer

VS

Answer

VNE

Answer

VX

Answer

VR

Question 41

The angle (alpha) shown in the figure is referred to as... See figure (PFA-003) DoF: direction of airflow (1,00 P.) Siehe Anlage 3

Accepted Answer

Angle of attack.

Answer

Lift angle.

Answer

Angle of incidence

Answer

Angle of inclination

Question 42

Which constructive feature has the purpose to reduce stearing forces?

Accepted Answer

Aerodynamic rudder balance

Answer

T-tail

Answer

Vortex generators

Answer

Differential aileron deflection

Question 43

Rotation around the vertical axis is called...

Accepted Answer

Yawing

Answer

Rolling

Answer

Pitching

Answer

Slipping

Question 44

Which of the listed wing shapes has the lowest induced drag?

Accepted Answer

Elliptical shape

Answer

Double trapezoidal shape

Answer

Rectangular shape

Answer

Trapezoidal shape

Question 45

The ratio of span and mean chord length is referred to as...

Accepted Answer

Aspect ratio.

Answer

Trapezium shape.

Answer

Tapering

Answer

Wing sweep.

Question 46

The pressure compensation between wind upper and lower surface results in ...

Accepted Answer

Induced drag by wing tip vortices.

Answer

Laminar airflow by wing tip vortices.

Answer

Profile drag by wing tip vortices.

Answer

Lift by wing tip vortices

Question 47

What kind of drag is NOT part of the parasite drag?

Accepted Answer

Induced drag

Answer

Interference drag

Answer

Skin-friction drag

Answer

Form drag

Question 48

What is the function of the horizontal tail (among other things)?

Accepted Answer

To stabilise the aeroplane around the lateral axis

Answer

To initiate a curve around the vertical axis

Answer

To stabilise the aeroplane around the longitudinal axis

Answer

To stabilise the aeroplane around the vertical axis

Question 49

The bank in a two-minute turn (rate one turn) depends on the...

Accepted Answer

TAS

Answer

Weight

Answer

Wind

Answer

Load factor.

Question 50

The aerodynamic rudder balance...

Accepted Answer

Reduces the control stick forces

Answer

Improves the rudder effectiveness.

Answer

Reduces the control surfaces

Answer

Delays the stall.

Question 51

Compared to trailing edge flaps, leading edge devices like Slots...

Accepted Answer

Produce less drag while allowing a higher angle of attack.

Answer

Reduce the critical angle of attack at a given speed.

Answer

Allow higher speeds at take-off and landing

Answer

Increase the camber and allow a lower angle of attack.

Question 52

When extending the flaps for landing at constant angle of attack, in which way does the lift coefficient change far before reaching the maximum lift coefficient?

Accepted Answer

It increases

Answer

It decreases

Answer

It is not possible to define

Answer

It remains constant

Question 53

Point number 5 in the figure indicates which flight state? See figure (PFA-008) (1,00 P.) Siehe Anlage 5

Accepted Answer

Slow flight

Answer

Best gliding angle

Answer

Stall

Answer

Inverted flight

Question 54

What is the function of the static rudder balance?

Accepted Answer

To prevent control surface flutter

Answer

To trim the controls almost without any force

Answer

To increase the control stick forces

Answer

To limit the control stick forces

Question 55

During a stall, the lift...

Accepted Answer

During a stall, the lift...

Answer

Increases and drag decreases.

Answer

Increases and drag increases.

Answer

Decreases and drag decreases.

Question 56

Stability around which axis is mainly influenced by the center of gravity's longitudinal position?

Accepted Answer

Lateral axis

Answer

Vertical axis

Answer

Longitudinal axis

Answer

Gravity axis

Question 57

All aerodynamic forces can be considered to act on a single point. This point is called...

Accepted Answer

Center of pressure.

Answer

Center of gravity.

Answer

Lift point.

Answer

Transition point.

Question 58

Which point on the aerofoil is represented by number 4? See figure (PFA-009) (1,00 P.) Siehe Anlage 2

Accepted Answer

Separation point

Answer

Center of pressure

Answer

Transition point

Answer

Stagnation point

Question 59

Rotation around the lateral axis is called...

Accepted Answer

Pitching

Answer

Rolling

Answer

Stalling

Answer

Yawing

Question 60

The angle of attack is the angle between...

Accepted Answer

The chord line and the oncoming airflow

Answer

The undisturbed airflow and the longitudinal axis of an aeroplane.

Answer

The chord line and the longitudinal axis of an aeroplane

Answer

The wing and the fuselage of an aeroplane.

Question 61

What is the diffeence between spin and spiral dive?

Accepted Answer

Spin: stall at inner wing, speed constant; Spiral dive: airflow at both wings, speed increasing rapidly

Answer

Spin: stall at outer wing, speed constant; Spiral dive: airflow at both wings, speed increasing rapidly

Answer

Spin: stall at outer wing, speed increasing rapidly; Spiral dive: airflow at both wings, speed constant

Answer

Spin: stall at inner wing, speed increasing rapidly; Spiral dive: airflow at both wings, speed constant

Question 62

What types of boundary layers can be found on an aerofoil?

Accepted Answer

Laminar layer at the leading wing areas, turbulent boundary layer at the trailing areas

Answer

Turbulent boundary layer along the complete upper surface with separated airflow

Answer

Turbulent layer at the leading wing areas, laminar boundary layer at the trailing areas

Answer

Laminar boundary layer along the complete upper surface with non-separated airflow

Question 63

Which kinds of drag contribute to total drag?

Accepted Answer

Induced drag and parasite drag

Answer

Form drag, skin-friction drag, interference drag

Answer

Interference drag and parasite drag

Answer

Induced drag, form drag, skin-friction drag

Question 64

If surrounded by airflow (v > 0), any arbitrarily shaped body produces...

Accepted Answer

Drag

Answer

Lift without drag.

Answer

Drag and lift.

Answer

Constant drag at any speed.

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