POF – 10 Stability Part 2 ( Lateral & Load Factor ) – LMS

Results

Q1. Static lateral stability should not be too large, because:

too much rudder deflection would be required in a crosswind landing

too much aileron deflection would be required in a crosswind landing

constant aileron deflection would be required during cruise in case of crosswind

the roll trim sensitivity would increase sharply

Q2. For an aircraft with neutral static roll stability, following a wing drop:

the wing would tend to return to the level position

the wing would continue to drop

the wing would remain in its displaced position

the forces of lift and weight would remain in balance

Q3. Wing dihedral:

Has no effect on static lateral stability

Is usually applied to aeroplanes with high mounted wings

Contributes to static stability

Is the only effective way of ensuring static lateral stability

Q4. The primary purpose of dihedral is to:

Increase dynamic stability

Increase sensitivity to Dutch Roll

Decrease sensitivity to Dutch Roll

Increase static directional stability

Q5. Which of these statements are correct or incorrect regarding a sideslip, with the relative airflow coming from the left, on an aeroplane that exhibits both directional and lateral stability?I. The initial tendency of the nose of the aeroplane is to move to the rightII. The initial tendency of the right wing is to move down

1 is incorrect; 2 is correct

1 is correct; 2 is correct

1 is correct; 2 is incorrect

1 is incorrect; 2 is incorrect

Q6. Static lateral stability will be decreased by:

The use of high, rather than low, wing mounting

Increasing wing sweepback

Increasing the size of the vertical tail

Increasing wing Anhedral

Q7. An increase in geometric dihedral in a steady sideslip condition at constant speed would

Increase the required lateral control force

Not affect the required lateral control force

Decrease the stick force per g

Decrease the required lateral control force

Q8. Dihedral of the wing:

is the only way to increase the static lateral stability

increases the static lateral stability

is only positive for aeroplanes with high mounted wings

decreases the static lateral stability

Q9. What happens to lateral stability when flaps are extended?

Lateral stability is decreased

Lateral stability is increased as lift is increased

Lateral stability is unaffected, as the wings are symmetrical

Lateral stability is increased as the centre of pressure moves inboard

Q10. Positive static lateral stability is the tendency of the aeroplane to:

Roll to the left in the case of a sideslip (with the aeroplane nose pointing to the left of the incoming flow)

Roll to the left in the case of a sideslip angle (with the aeroplane nose pointing to the right of the incoming flow)

Roll to the left in a right turn

Roll to the right in a right turn

Q11. Excessive static lateral stability is an undesirable characteristic for a transport aeroplane because:

It would result in excessive wing loading during a coordinated turn

Performing coordinated turns would be very difficult

It would impose excessive demands on roll control during a sideslip

It would result in a proportional decline in static directional stability

Q12. Positive static lateral stability is the tendency of an aeroplane to:

roll to the left in the case of a sideslip angle (with the aeroplane nose pointing to the right of the incoming flow)

roll to the left in the case of a sideslip (with the aeroplane nose pointing to the left of theincoming flow)

roll to the right in a right turn

roll to the left in a right turn

Q13. Static lateral stability should not be too small because:

the aeroplane would show too strong a tendency to spiral dive

after a disturbance around the longitudinal axis the aeroplane would show too strong a tendency to return to the original attitude

the stick force per g would become unacceptably small

the aeroplane would show too strong a tendency to Dutch roll

Q14. Which statement concerning sweepback is correct?

Sweepback provides a positive contribution to static lateral stability

Sweepback increases speed stability at Mach numbers above Mcrit

Sweepback is mainly intended to increase static directional stability

A disadvantage of sweepback is that it decreases Mcrit

Q15. Sweepback of a wing positively influences:1. Static longitudinal stability.2. Static lateral stability.3. Dynamic longitudinal stability.The combination that regroups all of the correct statements is:

2 only

3 only

1,2 and 3

1 only

Q16. With increasing altitude and constant IAS the static lateral stability (1) and the dynamic lateral/directional stability (2) of an aeroplane with swept-back wing will:

(1) increase; (2) increase

(1) increase; (2) decrease

(1) decrease; (2) decrease

(1) decrease; (2) increase

Q17. The effect of a swept wing is to give:

positive dihedral effect

negative dihedral effect

decreased roll-with-yaw effect

adverse yaw effect

Q18. When considering the effect of a swept wing on stability with an increase in altitude, which of the following is correct?

increased static lateral stability/decreased dynamic lateral stability

decreased static lateral stability/decreased dynamic lateral stability

same static lateral stability/reduced dynamic lateral stability

increased static lateral stability/same dynamic lateral stability

Q19. Which of the following lists aeroplane features that each increase static lateral stability?

Fuselage mounted engines, dihedral, T-tail

Low wing, dihedral, elliptical wing planform

High wing, sweep back, large and high vertical fin

Sweep back, uner wing mounted engines, winglets

Q20. Static lateral stability will be increased by:

Reducing wing sweepback

The use of high, rather than low, wing mounting

Reducing the size of the vertical tail

Increasing the wing anhedral

Q21. Static lateral stability will be increased by:

Reducing the size of the vertical tail

The use of low, rather than high, wing mounting

Reducing wing anhedral

Reducing wing sweepback

Q22. Static lateral stability will be decreased by:

Reducing wing sweepback

Increasing the size of the vertical tail

The use of high, rather than low, wing mounting

Reducing wing anhedral

Q23. Static lateral stability will be increased by:

Reducing the size of the vertical tail

Increasing wing sweepback

The use of low, rather than high, wing mounting

Increasing wing anhedral

Q24. How can the designer of an aeroplane with straight wings increase the static lateral stability?By increasing the aspect ratio of the vertical stabiliser, whilst maintaining a constant area

By fitting a ventral fin (a fin at the under side of the aeroplane)

By applying wing twist

By increasing anhedral

Q25. Which wing design feature decreases the static lateral stability of an aeroplane?

High wing

Increased wingspan

Anhedral

Dihedral

Q26. Which design features improve static lateral stability?1. Anhedral.2. Dihedral.3. Forward sweep.4. Sweepback.The combination that regroups all of the correct statements is:

2 and 3

1 and 3

1 and 4

2 and 4

Q27. Which design features improve static lateral stability?1. High wing2. Low wing3. Large and high vertical fin4. Ventral finThe combination that regroups all of the correct statements is:

2,4

1,4

2,3

1,3

Q28. Which design features reduce static lateral stability?1. High wing2. Low wing3. Large and high vertical fin4. Ventral finThe combination that regroups all of the correct statements is:

2 and 4

2 and 3

1 and 4

1 and 3

Q29. Which design features reduce static lateral stability?1. Anhedral2. Dihedral3. Forward sweep4. SweepbackThe combination that regroups all of the correct statements is:

2 and 3

2 and 4

1 and 4

1 and 3

Q30. Which type of wing arrangement decreases the static lateral stability of an aeroplane?

Increased wing span

Dihedral

High wing

Anhedral

Q31. The effect of a high wing with zero dihedral is as follows:

its only purpose is to ease aeroplane loading

Negative dihedral effect

Positive dihedral effect

Zero dihedral effect

Q32. The effect on static lateral stability of an aeroplane with a high wing as compared with a low wing is:

zero dihedral effect

a negative dihedral effect

no effect as it is only used to improve aeroplane loading

a positive dihedral effect

Q33. Which of the following does not increase lateral stability?

large fin area

large keel surface with low CG

anhedral

dihedral

Q34. Which of the following will increase lateral stability?

dihedral/wing mounted engines/high wing

high wing/high vertical stabiliser/sweepback

low wing/dihedral/elliptical plan form

anhedral/low wing/sweepback

Q35. Which of the following will reduce lateral stability?

Anhedral

Tip tanks

Dihedral

Wing root fairing

Q36. The stick force per g or a heavy transport aeroplane is 300 N/g. What stick force is required, if the aeroplane in the clean configuration is pulled to the limit maneuvering load factor from a trimmed horizontal straight and steady flight?

450N

1125N

750N

825N

Q37. The manoeuvre stability of a large jet transport aeroplane is 280 N/g. What stick force is required, if the aeroplane is pulled to the limit manoeuvring load factor from a trimmed horizontal straight and steady flight? (cruise configuration)

1050 N

770 N

630 N

420 N

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Results

Q1. Static lateral stability should not be too large, because:

Q2. For an aircraft with neutral static roll stability, following a wing drop:

Q3. Wing dihedral:

Q4. The primary purpose of dihedral is to:

Q6. Static lateral stability will be decreased by:

Q7. An increase in geometric dihedral in a steady sideslip condition at constant speed would

Q8. Dihedral of the wing:

Q9. What happens to lateral stability when flaps are extended?

Q10. Positive static lateral stability is the tendency of the aeroplane to:

Q11. Excessive static lateral stability is an undesirable characteristic for a transport aeroplane because:

Q12. Positive static lateral stability is the tendency of an aeroplane to:

Q13. Static lateral stability should not be too small because:

Q14. Which statement concerning sweepback is correct?

Q15. Sweepback of a wing positively influences:1. Static longitudinal stability.2. Static lateral stability.3. Dynamic longitudinal stability.The combination that regroups all of the correct statements is:

Q16. With increasing altitude and constant IAS the static lateral stability (1) and the dynamic lateral/directional stability (2) of an aeroplane with swept-back wing will:

Q17. The effect of a swept wing is to give:

Q18. When considering the effect of a swept wing on stability with an increase in altitude, which of the following is correct?

Q19. Which of the following lists aeroplane features that each increase static lateral stability?

Q20. Static lateral stability will be increased by:

Q21. Static lateral stability will be increased by:

Q22. Static lateral stability will be decreased by:

Q23. Static lateral stability will be increased by:

Q24. How can the designer of an aeroplane with straight wings increase the static lateral stability?By increasing the aspect ratio of the vertical stabiliser, whilst maintaining a constant area

Q25. Which wing design feature decreases the static lateral stability of an aeroplane?

Q26. Which design features improve static lateral stability?1. Anhedral.2. Dihedral.3. Forward sweep.4. Sweepback.The combination that regroups all of the correct statements is:

Q27. Which design features improve static lateral stability?1. High wing2. Low wing3. Large and high vertical fin4. Ventral finThe combination that regroups all of the correct statements is:

Q28. Which design features reduce static lateral stability?1. High wing2. Low wing3. Large and high vertical fin4. Ventral finThe combination that regroups all of the correct statements is:

Q29. Which design features reduce static lateral stability?1. Anhedral2. Dihedral3. Forward sweep4. SweepbackThe combination that regroups all of the correct statements is:

Q30. Which type of wing arrangement decreases the static lateral stability of an aeroplane?

Q31. The effect of a high wing with zero dihedral is as follows:

Q32. The effect on static lateral stability of an aeroplane with a high wing as compared with a low wing is:

Q33. Which of the following does not increase lateral stability?

Q34. Which of the following will increase lateral stability?

Q35. Which of the following will reduce lateral stability?

Q36. The stick force per g or a heavy transport aeroplane is 300 N/g. What stick force is required, if the aeroplane in the clean configuration is pulled to the limit maneuvering load factor from a trimmed horizontal straight and steady flight?

Q37. The manoeuvre stability of a large jet transport aeroplane is 280 N/g. What stick force is required, if the aeroplane is pulled to the limit manoeuvring load factor from a trimmed horizontal straight and steady flight? (cruise configuration)

Thank You