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

Question 1

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 2

What structural item provides lateral stability to an airplane?

Accepted Answer

Wing dihedral

Answer

Differential aileron deflection

Answer

Vertical tail

Answer

Elevator

Question 3

Which of the following options is likely to produce large induced drag?

Accepted Answer

Small aspect ratio

Answer

Large aspect ratio

Answer

Tapered wings

Answer

Low lift coefficients

Question 4

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 5

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 6

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 7

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 8

Pressure compensation on an wing occurs at the...

Accepted Answer

Wing tips.

Answer

Wing roots

Answer

Trailing edge

Answer

Leading edge.

Question 9

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

Accepted Answer

TAS

Answer

Weight

Answer

Wind

Answer

Load factor.

Question 10

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 11

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 12

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 13

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 14

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

Accepted Answer

VS

Answer

VNE

Answer

VX

Answer

VR

Question 15

The trim tab at the elevator is defelected upwards. In which position is the corresponding indicator?

Accepted Answer

Nose-down position

Answer

Neutral position

Answer

Nose-up position

Answer

Laterally trimmed

Question 16

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 17

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

Accepted Answer

Inverted flight

Answer

Stall

Answer

Best gliding angle

Answer

Slow flight

Question 18

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 19

What is meant by "ground effect"?

Accepted Answer

Increase of lift and decrease of induced drag close to the ground

Answer

Increase of lift and increase of induced drag close to the ground

Answer

Decrease of lift and increase of induced drag close to the ground

Answer

Decrease of lift and decrease of induced drag close to the ground

Question 20

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 21

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.

Question 22

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 23

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 24

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 25

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 26

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 27

What pattern can be found at the stagnation point?

Accepted Answer

Streamlines are divided into airflow above and below the profile

Answer

The boundary layer starts separating on the upper surface of the profile

Answer

The laminar boundary layer changes into a turbulent boundary layer

Answer

All aerodynamic forces can be considered as attacking at this single point

Question 28

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 29

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 30

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 31

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 32

What is the advantage of differential aileron movement?

Accepted Answer

The drag of the downwards deflected aileron is lowered and the adverse yaw is smaller

Answer

The ratio of the drag coefficient to lift coefficient is increased

Answer

The adverse yaw is highe

Answer

The total lift remains constant during aileron deflection

Question 33

How do lift and drag change when setting flaps to a lower position?

Accepted Answer

Lift increases, drag increases

Answer

Lift increases, drag decreases

Answer

Lift decreases, drag decreases

Answer

Lift decreases, drag increases

Question 34

Flying with speeds higher than the never-exceed-speed (vNE) may result in...

Accepted Answer

Flutter and mechanically damaging the wings.

Answer

Too high total pressure resulting in an unusable airspeed indicator.

Answer

An increased lift-to-drag ratio and a better glide angle

Answer

Reduced drag with increased control forces

Question 35

Which effect does a decreasing airspeed have on the induced drag during a horizontal and stable cruise flight?

Accepted Answer

The induced drag will increase

Answer

The induced drag will collapse

Answer

The induced drag will remain constant

Answer

The induced drag will slightly decrease

Question 36

Which statement describes a situation of static stability?

Accepted Answer

An aircraft distorted by external impact will return to the original position

Answer

An aircraft distorted by external impact will tend to an even more deflected position

Answer

An aircraft distorted by external impact can return to its original position by rudder input

Answer

An aircraft distorted by external impact will maintain the deflected position

Question 37

How does a laminar boundary layer differ from a turbulent boundary layer?

Accepted Answer

The turbulent boundary layer can follow the airfoil camber at higher angles of attack

Answer

The laminar boundary layer produces lift, the turbulent boundary layer produces drag

Answer

The turbulent boundary layer is thicker and provides less skin-friction drag

Answer

The laminar boundary layer is thinner and provides more skin-friction drag

Question 38

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 39

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

Accepted Answer

1

Answer

4

Answer

2

Answer

3

Question 40

Stabilization around the lateral axis during cruise is achieved by the...

Accepted Answer

Horizontal stabilizer.

Answer

Airlerons

Answer

Wing flaps.

Answer

Vertical rudder.

Question 41

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 42

During cruise flight with constant power setting, an aircraft shows a permanent tendency to raise the nose. How can this tendency be eliminated?

Accepted Answer

By deflecting the elevator trim tab upwards

Answer

By shifting the center of gravity backwards

Answer

By elevator deflection upwards

Answer

By deflecting the elevator trim tab downwards

Question 43

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 44

After an engine failure, the windmilling propeller...

Accepted Answer

Generates drag rather than thrust.

Answer

Generates neither thrust nor drag.

Answer

Has a greater pitch in feathered position

Answer

Improves the properties of the glide

Question 45

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 46

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 47

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 48

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 49

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 50

Which design feature can compensate for adverse yaw?

Accepted Answer

Differential aileron defletion

Answer

Wing dihedral

Answer

Full deflection of the aileron

Answer

Aileron trim

Question 51

The elevator deflection during take-off rotation...

Accepted Answer

Is increased for a front centre of gravity.

Answer

Is increased for a rear centre of gravity

Answer

Is increased at high speeds.

Answer

Is independent of the speed.

Question 52

The drag coefficient...

Accepted Answer

Cannot be lower than a non-negative, minimal value.

Answer

Increases with increasing airspeed.

Answer

Is proportional to the lift coefficient.

Answer

May range from zero to an infinite positive value

Question 53

Bernoulli's equation for frictionless, incompressible gases states that...

Accepted Answer

Total pressure = dynamic pressure + static pressure.

Answer

Static pressure = total pressure + dynamic pressure

Answer

Total pressure = dynamic pressure - static pressure

Answer

Dynamic pressure = total pressure + static pressure.

Question 54

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 55

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 56

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 57

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 58

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 59

Which statement regarding the "constant-speed propeller" is correct?

Accepted Answer

The pitch of the propeller rises with higher speeds

Answer

The propeller keeps the airspeed constant

Answer

The RPM decreases with lower speeds

Answer

The set RPM is kept constant by the motor power (MAP)

Question 60

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 61

Through which factor listed below does the load factor increase during cruise flight?

Accepted Answer

An upward gust

Answer

A forward centre of gravity

Answer

Higher aeroplane weight

Answer

Lower air density

Question 62

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 63

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

Accepted Answer

Decreasing weight

Answer

Lower altitude

Answer

Lower density

Answer

Higher load factor

Question 64

Rotation around the vertical axis is called...

Accepted Answer

Yawing

Answer

Rolling

Answer

Pitching

Answer

Slipping

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