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Created / Updated	28.04.2022 / 11.05.2022
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The geometrical twist of wings is characterized itself by:

profiling geometric chord in subsequent sections do not lie in one line

the wings are bent down when parked glider on the ground

wings are bent upwards in the flight

on the wingtip sections profile are applied where the plane separation is less intense

Increasing the lift on the wing causes a change in the induced drag:

Greater.

Less.

It has no effect on induced drag.

Smaller or greater depending from the speed of flight.

Increasing the angle of attack alpha > alpha cr causes:

Increasing the "Cx" and reducing the "Cz".

"Cx".Increasing the "Cz", and reducing the "Cx".

Increasing the "Cx" and "Cz".

Reducing the "Cx" and "Cz".

What kind of rule is? "In the tunnel by which an air flows a product of cross-sectional area and an air velocity is constant S * v = const"

The Equation of Continuity.

The Bernoulli's principle.

The Bernoulli Principles.

The moment of momentum principle.

What kind of rule is? "In the tunnel by which an air flows, the sum of static and dynamic pressure is constant at every point of the movement"

the Bernouli right B

the principle of movement continuity

the principle of conservation of energy flow

the principle of conservation of closedflow pressure

To describe the movements of aircraft (airplane, helicopter, glider, etc.) in the space system is used three axes. How the vertical axis is marked?

Normal axis. z

Longitudal axis x

Lateral axis. y

On discretion.

To describe the movements of aircraft (airplane, helicopter, glider, etc.) in the space system iaxes xyz is used. How the longitudinal axis is marked?

Longitudal axis. x

Lateral axis. y

Normal axis. z

There is no marking.

To describe the movements of aircraft (airplane, helicopter, glider, etc.) in the space system axes xyz is used. How is the transverse axis marked?

Lateral axis. y

Longitudal axis. x

Normal axis. z

On discretion.

When air flows through the channel of variable cross-sectional area the static pressure changes. How?

Decreases with decreasing cross-sectional area.

Decreases with increasing cross-sectional area.

Does not change at all.

Increases with reducing cross-sectional area.

How does an object behave (aircraft, helicopter, glider, hang-gliding, etc.) dynamically unstable after it has been balanced off?

The object moves, mostly harmonic, with increasing amplitude.

The object moves, the most often harmonic with damped oscilaion.

It remains the position after being balanced off.

It takes the position more distant from the balance position.

How does the object behave (aircraft, helicopter, glider, hang-gliding, etc.) dynamically stable being balanced off?

The object moves, most often harmonic, with damped oscilation.

It maintains the position wich it has reached after being balanced off.

Performing movement, most often harmonic, with divergent oscilation.

Immediately after the termination of the pulse precipitation returns to the balanced position.

How does the harmful drag behaved when increasing air speed?

Increases with the square of speed.

Remains constant.

Decreases proporconalnie to the inverse of speed.

Swinging.

How does the harmful drag behaved when increasing air speed?

The resistance increases with the square of speed.

The resistance remains constant.

The resistance decreases proportionally to the inverse of speed.

The resistance varies.

How will change the centrifugal force with the same speed of flight in the turn if the radious will be decrease itself?

Will increase.

Will decrease.

Remain unchanged.

Will decrease to zero.

How will change the centrifugal force with the same speed of flight in the turn if the radious will be decrease itself?

The centrifugal force increases.

The centrifugal force will decrease.

The centrifugal force will remain unchanged.

The centrifugal force will decrease to zero.

The angle of climb "gamma" on a constant angle of attack "alpha" during growth of altitude:

Remains unchange.

Increases.

Decreases.

Changes and it can be readed by drawing of the glider polar.

Flight takes place on the angle of attack, for which the drag coefficient Cd has the minimum of value: alpha=alpha(Cdmin). In a result of a small increase of angle of attack:

Maximum ratio Cl/Cd will increase.

Maximum ratio Cl/Cd will decrease.

Maximum ratio Cl/Cd will not change.

Maximum ratio Cl/Cd of the airframe will decreases.

Flight takes place on the angle of attack, for which the drag coefficient Cd has the minimum of value: alpha=alpha(Cdmin). In a result of a small increase of angle of attack:

Maximum ratio of airframe Cl/Cd will increase.

Maximum ratio of airframe Cl/Cd will decrease.

Maximum ratio of airframe Cl/Cd will not change.

Maximum ratio Cl/Cd will decrease.

Main type of spin is influenced by the following factors:

Glider's center of gravity, the glider mass-distribution, location and size of the empennage.

Glider's center of gravity, the glider mass-distribution, setting of trim tabs.

Distribution of the glider masses - setting of the trim tabs, location and size of the empennage.

setting of the trim tabs, glider's center of gravity, location and size of the empennage.

To recover of the plane from of skidding during the turn and make the correct turn to do perform:

To increase angle of bank or use rudder to increase of turn radious.

To reduce angle of bank or decrease of turn angle radious.

Increase angle of bank or to increase the angular velocity of the turn.

Reduce the bank or increase the angular velocity of the turn.

To recover of the plane from of the slliping during the turn and make the correct turn to do perform:

To reduce the angle of bank or use rudder to decrease of turn radious.

Increase the pitch of turn.

Increase angular roll or increase the bank.

What is that rule? "In the tunnel through which air flows and cross-product of the air velocity is constant S * v = const

The Equation of Continuity.

Bernouli principle.

The Bernoulli's law.

The principle of conservation of momentum.

What kind is that rule? In the tunnel by which air flows, the product of static and dynamic pressure is constant in each point of airflow.

The Bernoulli's principle.

The Equation of contuity principle.

The principle of conservation of energy flow.

The principle of conservation of closed-flow pressure

Does is between the steering and stability of a flying object (plane, helicopter, glider etc.) some relation to each other?

They operate against to each other.

They coopoperate.

There is no relationship between them.

Stability supported a longitudinal steering.

Does a proppeler efficiency (eta)"h" for the fixed propeller can take the value zero? If yes, in what circumstances?

The propeller has RPM and the airplane has a speed TAS = 0 or TAS is so large that it don't gives any Thrust.

Only when the propeller has RPM and the airplane has a TAS = 0.

Only when TAS is so large that Thrust is 0.

(ETA)"h" can not take a zero value.

When an air flows by the stream tube with variable changed cross-sectional area the static pressure changes itself. How?

Decreases with the reduction of the crosssectional area.

Decreases with increasing cross-sectional area.

Does not change at all.

Increases with the reduction of cross-sectional area.

How does the object behave (aircraft, helicopter, hang-gliding, etc.) dynamically unstable after being balanced off?

The object moves, mostly harmonic, with increasing amplitude.

The object moves, mostly harmonic, with decreasing amplitude.

It remains the position after being balnced off .

It takes the position more and more distant from the balanced position.

How does the object behave (aircraft, helicopter, hang-gliding, etc.) dynamically stable after being balanced off?

The object moves, most often harmonic, with decreasing amplitude.

It maintains the position it reached after being balanced off .

Performs the movement, mostly harmonic, with increasing amplitude.

Immediately after the termination of the pulse precipitation returns to the balanced position.

How does harmful resistance behave with increased flight speed

Increases with the square of speed.

Remains constant.

Decreases in proportion to the inverse of speed.

Swing.

How does is harmful resistance behave with increased flight speed?

The drag increases with the square of speed.

The drag remains constant.

The drag decreases proportionally to the inverse of speed.

The drag swing.

How will the centrifugal force change during turn with the same speed if radius of turn will be reduced?

Increase itself.

Decrease itself.

Remain unchanged.

Decrease itself to zero.

How will the centrifugal force change if (at the same linear speed) you decrease the radius?

It will increase.

It will decrease.

It will remain unchanged.

It will decrease to zero.

How does the minimum speed and maximum level flight speed change with increasing altitude?

Vmin increases / Vmax decreases.

Vmin increases / Vmax increases.

Vmin decreases / Vmax decreases.

Vmin decreases / Vmax increases.

What changes in the arcraft attitude are be responsible for creation of the giroscopic moment of powerplant?

Pitch, yaw.

Pitch, roll.

Yaw, roll.

Acceleration- braking.

If the wing autorotation is not stopped by the pilot:

The airplane will automatically go into the flight phase called spin.

The airplane will automatically go into the flight phase called static stall.

The airplane will automatically go into the flight phase called dynamic stall.

The airplane wili automatically go into the flight phase called spiral.

If the advance ratio increases:

Angles of attack of individual prop blade sections decrease.

Angles of attack of individual prop blade sections increase.

Angles of attack of individual prop blade sections decreasedoes not change.

Angles of attack of individual prop blade sections reach critical values.

If the aircraft center of gravity coincides with the neutral point:

The airplane is neither stable nor unstable.

The airplane is stable.

The airplane is unstable.

The airplane is uncontrollable.

If the center of gravity of the airplane with a cambered aerofoil is placed forward of the neutral point:

The airplane is stable.

The airplane is unstable.

The airplane is statically neutral.

The airplane is neither stable nor notunstable.

If the center of gravity of the airplane with a cambered aerofoil is placed aft of the neutral balance center:

The airplane is unstable.

The airplane is not steering.

The airplane is stable.

The airplane is neither stable nor unstable.

If the speed of flight is significantly increased (fixed pitch propeller):

Blade angle of attack decreases.

Blade angle of attack increases slightly.

Blade angle of attack does not change.

Blade angle of attack increases substantially.

PL080 - Principles of Flight PPL(A)

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