Unit 5: Aircraft Performance in Accelerated Flight - Practice Quiz

1 What is the take-off distance of an aircraft?

2 Which condition generally increases the take-off distance?

3 For constant acceleration from rest, which equation gives the take-off ground roll ?

4 An aircraft accelerates uniformly from rest at until it reaches . What is its ground roll?

5 For a straight climb at angle , which expression gives the horizontal distance needed to gain obstacle height ?

6 If the climb angle increases while obstacle height remains unchanged, what happens to the airborne distance required?

7 What condition defines a balanced field length?

8 Which take-off speed is central to determining balanced field length?

9 Which change generally increases landing distance?

10 Which runway condition generally produces the longest landing distance?

11 An aircraft descends from a height of along a path with . What is the horizontal approach distance?

12 If an aircraft follows a shallower approach angle from the same height, what happens to its horizontal approach distance?

13 During landing, what is the main purpose of the flare?

14 If an aircraft's average horizontal speed during a flare is , what is the flare distance?

15 For constant deceleration of magnitude from touchdown speed to rest, which equation gives the landing ground roll ?

16 An aircraft touches down at and decelerates uniformly at . What is its landing ground roll?

17 What happens to induced drag when an aircraft flies close to the ground?

18 During landing, ground effect commonly causes an aircraft to do what?

19 For an aircraft accelerating along a climb path, what produces forward acceleration?

20 Which equation represents acceleration along a climb path at angle ?

21 An aircraft takes off from a hot, high-altitude airport. Assuming the same aircraft weight and configuration, how will the increased density altitude generally affect take-off distance?

22 In a simplified constant-acceleration take-off model, an aircraft lifts off at an airspeed of . If a headwind is introduced without changing acceleration, approximately how much does the ground-roll distance decrease?

23 An aircraft starts its take-off roll from rest and reaches with a constant average acceleration of . What is its ground-roll distance?

24 During take-off, a aircraft has an average thrust of , aerodynamic drag of , and rolling resistance of . If these forces are constant, what distance is required to reach from rest?

25 After lift-off, an aircraft follows a straight flight path at a climb angle of . What horizontal distance is required to gain of height?

26 At the end of its take-off transition, an aircraft is above the runway and horizontally from lift-off. It then climbs at . What total airborne distance from lift-off is needed to clear a obstacle?

27 For a given runway condition and aircraft configuration, when is the take-off field considered balanced?

28 All other conditions remaining unchanged, what is the usual effect of increasing the decision speed ?

29 An aircraft's landing weight increases by . If the same landing configuration and lift coefficient are used, approximately how much does the required approach speed increase?

30 How does a downhill runway slope generally affect landing ground-roll distance?

31 An aircraft begins a straight approach at a height of above the runway. Neglecting the flare, what is the horizontal approach distance?

32 During a constant approach, an aircraft has a horizontal ground speed of and a descent rate of . How much horizontal distance is covered while descending through the final ?

33 An aircraft performs a circular flare of radius , changing its flight-path angle from to horizontal. What is the approximate horizontal flare distance?

34 During a shallow circular flare, an aircraft travels at with a load factor of . Using , what is the approximate horizontal distance required to change the flight-path angle by ?

35 An aircraft touches down at and experiences a constant average deceleration of . What is the landing ground-roll distance?

36 Deployment of reverse thrust increases an aircraft's average landing deceleration from to . For the same touchdown speed, by approximately what percentage is the ground roll reduced?

37 An aircraft enters ground effect while maintaining approximately the same speed and lift coefficient. What aerodynamic change should the pilot expect?

38 Why may an aircraft that lifts off prematurely settle back toward the runway after climbing out of ground effect?

39 A aircraft climbs at a flight-path angle of . Thrust is and drag is . Using , what is its acceleration along the flight path?

40 An aircraft has a specific excess power of while climbing at with an airspeed of . Using , what is its acceleration?

41 An aircraft lifts off at an airspeed of . Assume constant ground-referenced acceleration and neglect changes in aerodynamic forces caused by wind. Compared with a no-wind take-off, what percentage reduction in ground-roll distance results from a steady headwind?

42 A aircraft has , , and at a representative take-off speed. The rolling-friction coefficient is . Using constant acceleration at these representative forces, what distance is required to reach ?

43 During a take-off roll, acceleration varies with ground speed according to in SI units. Starting from rest, what ground distance is required to reach ?

44 After lift-off at , an aircraft follows a circular transition defined by with , before establishing an climb. How much horizontal airborne distance is required to clear a obstacle if the obstacle is reached during the transition?

45 An aircraft lifts off at and enters a constant-speed circular transition with until reaching a climb. It then climbs along a straight path. Using , what horizontal airborne distance is required to clear a obstacle?

46 For a given runway condition, accelerate-stop and accelerate-go distances vary with decision speed as and , with distances in metres and in knots. What are the balanced and balanced field length?

47 On a wet runway, suppose and , where distance is in metres and is in knots. Which pair gives the balanced decision speed and field length?

48 The approximate dynamic-hydroplaning speed is knots when tire pressure is in psi. For tires inflated to and touchdown at , which statement is correct?

49 An aircraft crosses a screen height on a straight glide path. The flare begins at above the runway. Neglecting curvature before flare, what is the horizontal approach distance between these points?

50 An aircraft descends through still air at a TAS of on a air-relative glide path while encountering a steady headwind. Assuming no vertical wind, what ground distance is covered while descending ?

51 A flare is modelled as a constant-speed circular arc using . If , , and the initial descent angle is , what are the horizontal flare distance and height loss when the flight path becomes horizontal?

52 A constant-speed circular flare begins on a descent path at and must lose exactly before becoming horizontal. Using , what load factor is required?

53 After touchdown at , an aircraft decelerates at until reaching . Reverse thrust is then removed, and deceleration becomes until rest. What is the total landing ground roll?

54 A aircraft touches down at . During the roll, assume constant lift , aerodynamic drag , reverse thrust , and braking coefficient . What stopping distance results under the constant-force approximation?

55 An aircraft's out-of-ground-effect drag consists of parasite drag and induced drag. Ground effect multiplies induced drag by . At , by what percentage does total drag decrease if parasite drag is unchanged?

56 An aircraft becomes airborne below its normal rotation speed while deeply within ground effect. Which outcome best explains why obstacle-clearance capability may remain poor despite the initial lift-off?

57 An aircraft weighs and climbs at a constant flight-path angle of . At one instant, thrust is and drag is . Neglecting wind, what is its tangential acceleration?

58 At , an aircraft has specific excess power while its instantaneous climb rate is . Assuming constant mass, what is its tangential acceleration?

59 An aircraft climbing at and increases its flight-path angle at without changing speed. Neglecting thrust normal to the flight path, what lift-to-weight ratio is required?

60 On a level runway, an aircraft has a constant net accelerating force of . It then uses a uphill runway, where only the additional downslope weight component changes. If and lift-off ground speed is unchanged, by what percentage does ground-roll distance increase?