Flashcards in POF PRT02 actual Deck (25)
Which one of the following systems suppresses the tendency to "Dutch roll"?
a. Yaw damper. Correct
b. Spoiler mixer.
c. Rudder limiter.
d. Roll spoilers.
An aeroplane is sensitive to Dutch roll when?
a. static lateral stability is much less pronounced than static directional stability
b. static lateral stability is much less pronounced than static longitudinal stability
c. an aeroplane has anhedral.
d. static lateral stability is much more pronounced than static directional stability.
What is the recommended action following failure of the yaw damper(s) of a jet aeroplane, flying at normal cruise altitude and speed prior to encountering Dutch roll problems?
a. Manually recover any subsequent Dutch roll motion using rudder.
b. Increase Mach number to improve aerodynamic damping of any subsequent Dutch roll motion.
c. No action is required.
d. Reduce altitude and Mach number.
For an aeroplane to possess dynamic stability, it needs?
a. a large CG range.
b. static stability only
c. static stability and sufficient damping. Correct
d. sufficient damping only.
Sensitivity for spiral dive will occur when?
a. the static lateral and directional stability are both negative. Incorrect
b. the Dutch roll tendency is not suppressed at all by the yaw damper.
c. the Dutch roll tendency is too strongly suppressed by the yaw damper.
d. the static directional stability is negative and the static lateral stability is positive
In order to maintain constant speed during a level, co-ordinated turn, compared with straight and level flight, the pilot must?
a. increase angle of attack and keep thrust/power unchanged.
b. increase angle of attack and increase thrust/power Correct
c. increase thrust/power and keep angle of attack unchanged
d. increase thrust/power and keep angle of attack unchanged
What factors determine the distance travelled over the ground of an aeroplane in a glide?
a. The wind and the lift/drag ratio, which changes with angle of attack. Correct
b. The wind and the aeroplane's mass.
c. The wind and weight together with power loading, which is the ratio of power output to the weight.
d. The TAS and the maximum L/D with power available.
Ignoring downwash effects on the tailplane, extension of Fowler flaps, will produce?
a. a nose-up pitching moment.
b. a nose-down pitching moment. Correct
c. no pitching moment.
d. a force which reduces drag.
Wing flutter can be prevented by?
a. mounting the engines on the fuselage.
b. ensuring that the wing CG is ahead of its torsional axis. Correct
c. increasing wing elasticity
d. increasing the aspect ratio of the wing.
Outboard ailerons (if present) are normally used?
a. when the landing gear is up.
b. in low speed flight only. Correct
c. in high speed flight only.
d. at transonic and supersonic speeds only.
The pitch angle is defined as the angle between the?
a. longitudinal axis and the chord line.
b. speed vector axis and the longitudinal axis
c. longitudinal axis and the horizontal plane Correct
d. chord line and the horizontal plane.
Slat or flap asymmetry occurring after either extension or retraction, may have an effect on controllability since?
a. slat and flap asymmetry both cause a large rolling moment
b. slat and flap asymmetry both cause a large yawing moment.
c. slat asymmetry causes a large rolling moment, whereas flap asymmetry causes a large yawing moment
d. slat asymmetry causes a yawing moment, whereas flap asymmetry causes a large rolling moment.
An aeroplane is in a level turn, at a constant TAS of 300 kt, and a bank angle of 45°. Its turning radius is: (given: g= 10 m/s²)?
a. 4743 metres.
b. 3354 metres.
c. 2381 metres. Correct
d. 9000 metres.
Turning motion in a steady, level co-ordinated turn is created by?
a. the drag.
b. the centrifugal force.
c. the thrust.
d. the centripetal force.
Positive static longitudinal stability means that a...?
a. nose-up moment occurs after encountering an up-gust.
b. nose-down moment occurs with a speed change at constant angle of attack
c. nose-down moment occurs after encountering an up-gust. Correct
d. nose-up moment occurs with a speed change at constant angle of attack.
Flaperons are controls which combine the function of?
a. ailerons and elevator.
b. ailerons and flaps. Correct
c. flaps and elevator.
d. flaps and speed brakes.
a. change the turbulent boundary layer into a laminar boundary layer.
b. transfer energy from the free airflow into the boundary layer
c. take kinetic energy out of the boundary layer to reduce separation Incorrect
d. reduce the spanwise flow on swept wing.
In which situation would the wing lift of an aeroplane in straight and level flight have the highest value?
a. Aft centre of gravity and idle thrust.
b. Forward centre of gravity and idle thrust Correct
c. Aft centre of gravity and take-off thrust
d. Forward centre of gravity and take-off thrust.
The main purpose of a boundary-layer fence on a swept wing is to?
a. increase the critical Mach number.
b. improve the high speed handling characteristics
c. improve the lift coefficient of the trailing edge flaps.
d. improve the low speed handling characteristics
The purpose of correctly setting the leading and trailing edge devices on the wing of an aeroplane during take-off, approach and landing is to?
a. reduce stall speed, increase CLMAX with minimum increase in drag for take-off, but with a relatively high drag for approach and landing. Correct
b. reduce the take-off roll and increase the landing roll.
c. increase stall speed and CLMAX during take-off, but reduce stall speed with a relatively high drag during approach and landing.
d. reduce stall speed and drag during take-off and landing
The stall speed decreases: (all other relevant factors are constant)?
a. when flaps are retracted. Incorrect
b. in a horizontal turn.
c. when the CG is moved forward.
d. when, during a manoeuvre, the aeroplane nose is suddenly pushed firmly downwards (e.g. as in a push over).
The contribution of the wing to the static longitudinal stability of an aeroplane?
a. depends on CG location relative to the wing aerodynamic centre.
b. depends on the wing location relative to the fuselage.
c. is always negative. Incorrect
d. is positive if the wing has a positively cambered aerofoil section and the aerodynamic centre is ahead of the CG.
An aeroplane that tends to return to its pre-disturbed equilibrium position after the disturbance has been removed is said to have?
a. positive dynamic stability
b. positive static stability. Correct
c. neutral static stability.
d. neutral dynamic stability.
How is adverse yaw compensated for during entry into and roll out from a turn?
a. Differential aileron deflection Correct
b. Anti-balanced rudder control.
c. Servo tabs
d. Horn-balanced controls