Set of flashcards Principles of Flight

Flashcards	149
Language	English
Category	Technology
Level	University
Created / Updated	25.12.2024 / 20.01.2025
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Through which factor listed below does the load factor decrease during cruise flight?

A downward gust

An aft centre of gravity

Higher air density

Lower aeroplane weight

A downward gust

An aft centre of gravity

Higher air density

Lower aeroplane weight

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

The propeller keeps the airspeed constant

The pitch of the propeller rises with higher speeds

The RPM decreases with lower speeds

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

The propeller keeps the airspeed constant

The pitch of the propeller rises with higher speeds

The RPM decreases with lower speeds

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

What is the advantage of a "constant-speed propeller" compared to a "fixed-pitch propeller"?

It is more efficient over a greater speed range

It is less susceptible to interference by technical defects

It is designed to generate a higher thrust

It has a larger surface area and produces more thrust

It is more efficient over a greater speed range

It is less susceptible to interference by technical defects

It is designed to generate a higher thrust

It has a larger surface area and produces more thrust

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

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

the largest possible angle of attack at the blade tip.

that the most thrust is produced at the blade root.

that the most thrust is produced at the blade tip.

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

the largest possible angle of attack at the blade tip.

that the most thrust is produced at the blade root.

that the most thrust is produced at the blade tip.

After an engine failure, the windmilling propeller...

generates drag rather than thrust.

generates neither thrust nor drag.

improves the properties of the glide.

has a greater pitch in feathered position.

generates drag rather than thrust.

generates neither thrust nor drag.

improves the properties of the glide.

has a greater pitch in feathered position.

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

Propeller pitch is increased, sink rate is decreased

Propeller pitch is increased, sink rate is increased

Propeller pitch is decreased, sink rate is decreased

Propeller pitch is decreased, sink rate is increased

Propeller pitch is increased, sink rate is decreased

Propeller pitch is increased, sink rate is increased

Propeller pitch is decreased, sink rate is decreased

Propeller pitch is decreased, sink rate is increased

Point number 4 in the figure indicates which flight state? See figure (PFA-008)

Minimum drag

Best gliding angle

Inverted flight

Stall

Minimum drag

Best gliding angle

Inverted flight

Stall

Point number 1 in the figure indicates which flight state? See figure (PFA-008)

Minimum drag

Best gliding angle

Inverted flight

Stall

Minimum drag

Best gliding angle

Inverted flight

Stall

Point number 3 in the figure indicates which flight state? See figure (PFA-008)

Minimum drag

Best gliding angle

Inverted flight

Stall

Minimum drag

Best gliding angle

Inverted flight

Stall

To keep speed and altitude constant during a turn, compared to horizontal flight, the pilot has to...

increase the angle of attack and increase the thrust.

keep the angle of attack constant and increase the thrust.

decrease the angle of attack and increase the thrust.

increase the angle of attack and keep the thrust constant.

increase the angle of attack and increase the thrust.

keep the angle of attack constant and increase the thrust.

decrease the angle of attack and increase the thrust.

increase the angle of attack and keep the thrust constant.

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

TAS.

weight.

load factor.

wind.

TAS.

weight.

load factor.

wind.

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

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

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

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

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

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

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

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

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

Which statement concerning a flight during a turn is correct?

More lift than in straight and level flight is needed

The same amount of lift as in straight and level flight is needed

Less lift than in straight and level flight is needed.

Less lift than in a descent is needed.

More lift than in straight and level flight is needed

The same amount of lift as in straight and level flight is needed

Less lift than in straight and level flight is needed.

Less lift than in a descent is needed.

How is the balance of forces affected during a turn?

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

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

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

The net force results from superposition of gravity and centripetal forces

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

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

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

The net force results from superposition of gravity and centripetal forces

The elevator deflection during take-off rotation...

is increased for a front centre of gravity.

is increased at high speeds.

is increased for a rear centre of gravity.

is independent of the speed.

is increased for a front centre of gravity.

is increased at high speeds.

is increased for a rear centre of gravity.

is independent of the speed.

With regard to the forces acting, how can stationary gliding be described?

The sum of air forces acts along the direction of air flow

The sum of air forces acts along with the lift force

The lift force compensates the drag force

The sum of air forces compensates the gravity force

Keyboard commands:

= turn,

= for-/backward,

= scroll

The sum of air forces acts along the direction of air flow

The sum of air forces acts along with the lift force

The lift force compensates the drag force

The sum of air forces compensates the gravity force

What is the result of extending flaps with increasing aerofoil camber?

Maximum permissible speed increases

Minimum speed increases

Minimum speed decreases

C.G. position moves forward

Keyboard commands:

= turn,

= for-/backward,

= scroll

Maximum permissible speed increases

Minimum speed increases

Minimum speed decreases

C.G. position moves forward

Following a single-wing stall and pitch-down moment, how can a spin be prevented?

Deflect all rudders opposite to lower wing

Rudder opposite lower wing, releasing elevator to build up speed

Pushing the elevator to build up speed to re-attach airflow on wings

Pulling the elevator to bring the plane back to normal attitude

Keyboard commands:

= turn,

= for-/backward,

= scroll

Deflect all rudders opposite to lower wing

Rudder opposite lower wing, releasing elevator to build up speed

Pushing the elevator to build up speed to re-attach airflow on wings

Pulling the elevator to bring the plane back to normal attitude

Considering longitudinal stability, which C.G. position is most dangerous with a normal gliding plane?

Position beyond the rear C.G. limit

Position beyond the front C.G. limit

Position far back within permissible C.G. limits

Position too far aside permissible C.G. limits

Keyboard commands:

= turn,

= for-/backward,

= scroll

Position beyond the rear C.G. limit

Position beyond the front C.G. limit

Position far back within permissible C.G. limits

Position too far aside permissible C.G. limits

The static pressure of gases works...

in all directions

only in flow direction

only in the direction of the total pressure

only vertical to the flow direction

Keyboard commands:

= turn,

= for-/backward,

= scroll

in all directions

only in flow direction

only in the direction of the total pressure

only vertical to the flow direction

Which are the correct parameters of the International Standard Atmosphere (ISA)?

1013.25 hPa at MSL, +15° C at MSL, environmental lapse rate 2°/1000 ft

1000 hPa at MSL, +15° C at MSL, environmental lapse rate 2°/100 m

1013.25 hPa at 36000 ft, -56.5° C at the tropopause, environmental lapse rate 2°/1000 ft

1013.25 hPa at MSL, 0° C at MSL, environmental lapse rate 2°/1000 ft

Keyboard commands:

= turn,

= for-/backward,

= scroll

1013.25 hPa at MSL, +15° C at MSL, environmental lapse rate 2°/1000 ft

1000 hPa at MSL, +15° C at MSL, environmental lapse rate 2°/100 m

1013.25 hPa at 36000 ft, -56.5° C at the tropopause, environmental lapse rate 2°/1000 ft

1013.25 hPa at MSL, 0° C at MSL, environmental lapse rate 2°/1000 ft

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

total pressure = dynamic pressure - static pressure

total pressure = dynamic pressure + static pressure

static pressure = total pressure + dynamic pressure

dynamic pressure = total pressure + static pressure

Keyboard commands:

= turn,

= for-/backward,

= scroll

total pressure = dynamic pressure - static pressure

total pressure = dynamic pressure + static pressure

static pressure = total pressure + dynamic pressure

dynamic pressure = total pressure + static pressure

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

drag

constant drag at any speed

drag and lift

lift without drag

Keyboard commands:

= turn,

= for-/backward,

= scroll

drag

constant drag at any speed

drag and lift

lift without drag

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

center of gravity

lift point

transition point

center of pressure

Keyboard commands:

= turn,

= for-/backward,

= scroll

center of gravity

lift point

transition point

center of pressure

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

all aerodynamic forces of the profile.

gravity forces of the profile.

all forces of the profile.

only the resulting total drag.

Keyboard commands:

= turn,

= for-/backward,

= scroll

all aerodynamic forces of the profile.

gravity forces of the profile.

all forces of the profile.

only the resulting total drag.

Number 1 in the drawing corresponds to the... See figure (PFA-010)

chord.

chord line.

trailing edge.

camber line.

chord.

chord line.

trailing edge.

camber line.

Number 2 in the drawing corresponds to the... See figure (PFA-010)

angle of attack.

chord line.

chord.

profile thickness.

angle of attack.

chord line.

chord.

profile thickness.

Number 3 in the drawing corresponds to the... See figure (PFA-010)

camber line.

chord line.

chord.

thickness.

camber line.

chord line.

chord.

thickness.

Number 4 in the drawing corresponds to the... See figure (PFA-010)

camber.

thickness.

chord line.

trailing edge.

camber.

thickness.

chord line.

trailing edge.

The angle between the chord line and the direction of the oncoming airflow is called...

angle of stream.

angle of incidence.

angle of attack.

angle of lift.

angle of stream.

angle of incidence.

angle of attack.

angle of lift.

Principles of Flight - AC

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