P Pre-test (Aircraft Structures and Design)

1. Which type of structure is responsible for improving the aircraft's stability during flight?

A. Horizontal stabilizer

B. Strut

C. Fairing

D. Fuselage

A. Horizontal stabilizer

2. What is the tendency of an aircraft whose CG is too forward?

A. STOL

B. nose-heavy

C. VTOL

D. tail-heavy

B. nose-heavy

3. Materials that exhibit little or no yielding before failure are referred to as

A. Elastic material

B. Ductile material

C. Brittle material

D. Stiff material

C. Brittle material

4. A particle of mass 1 kg is moving in a circle with a radius of 2 m. If the particle's angular velocity is 2 rad/s, what is its kinetic energy?

A. 2J

B. 6J

C. 4J

D. 8J

C. 4J

5. An A992 steel column has a length of 5 m and is fixed at both ends. If the cross-sectional area has the dimensions shown, determine the critical load. Use Young's modulus of 200 (10^9) Pa.

A. 272 kN

B. 322 kN

C. 222 kN

D. 372 kN

A. 272 kN

6. A point mass of 1 kg is rotating about an axis passing through it. What is the moment of inertia of the point mass about this axis?

A. Infinite

B. 1 kg m^2

C. 2 kg m^2

D. Zero

D. Zero

7. What would be the effect of spoiler deflection on lift and drag?

A. lift decreases, drag increases

B. drag decreases, lift increases

C. lift remains the same, drag increases

D. lift and drag increase

A. lift decreases, drag increases

8. A ________ is similar to a balance tab in location and effect, but it is designed to operate the primary flight control surface, not just reduce the force needed to do so.

A. Flaps

B. Servo tab

C. Trim tab

D. Balance tab

B. Servo tab

9. This is the maximum load anticipated on its lifetime of service.

A. ultimate load

B. limit load

C. load factor

D. peak load

B. limit load

10. A beam is supported by a hinge at one end and a cable at the other end. The cable is attached to the beam 3 meters from the hinge. A load of 100 N is applied to the beam 2 meters from the hinge. What are the reactions at the hinge and the cable?

A. Hinge = 50 N, Cable = 50 N

B. Hinge = 33 N, Cable = 67 N

C. Hinge = 25 N, Cable = 75 N

D. Hinge = 100 N, Cable = 0 N

B. Hinge = 33 N, Cable = 67 N

11. What are the disadvantages of using trusses and frames in construction?

A. They are not as versatile as other types of structures.

B. They are vulnerable to wind and other forces.

C. They have a limited load capacity.

D. All of the above

A. They are not as versatile as other types of structures

12. Spoilers are unique in that they may also be fully deployed on both wings to act as

A. Ailerons

B. Speed Brakes

C. Thrust Reverser

D. Thrust Device

B. Speed Brakes

13. Which of the following components is responsible for transferring the loads between the wings and fuselage of an aircraft?

A. Fuselage frames

B. Wing ribs

C. Wing spars

D. Wing skins

C. Wing spars

14. It is a soft metal or plastic used to protect the airframe from damage caused by the cable system.

A. Phenolic Tape

B. Gusset Plates

C. Plastic Lugs

D. Grommet

D. Grommet

15. What is the main difference between a truss and a frame?

A. A truss is made up of a series of triangles, while a frame is made up of a series of beams and columns.

B. A truss is stronger than a frame.

C. A frame is more versatile than a truss.

D. None of the above

A. A truss is made up of a series of triangles, while a frame is made up of a series of beams and columns

16. Under which condition the aircraft wing produces greater lift while with less induced downwash

A. High aspect ratio; high wingtip area

B. Low aspect ratio; low wingtip area

C. High aspect ratio; low wingtip area

D. Low aspect ratio; High wingtip area

C. High aspect ratio; low wingtip area

17. The factors considered for critical load for column buckling.

A. Modulus of Elasticity, Moment of Inertia, and Length of the column

B. Modulus of Elasticity, Radius of Gyration, and Length of the column

C. Cross-sectional Area, Moment of Inertia, and Length of the column

D. Cross-sectional Area, Radius of Gyration, and Length of the column

A. Modulus of Elasticity, Moment of Inertia, and Length of the column

18. A thin rod of mass 10 kg and length 1 m is rotating about an axis passing through its center of mass and making an angle of 30 degrees with its length. What is the moment of inertia of the rod about this axis?

A. 1 kg m^2

B. 0.5 kg m^2

C. 0.2 kg m^2

D. 0.1 kg m^2

C. 0.2 kg m^2

19. A rigid body is rotating about a fixed axis with an angular velocity of 2 rad/s. If the body is subjected to a torque of 20 N m for 1 second, what is the angular displacement of the body?

A. 4 rad

B. 6 rad

C. 8 rad

D. 10 rad

B. 6 rad

20. Which of the following statements about normal stress is true?

A. It is always tensile in nature.

B. It can cause elongation or compression of a material.

C. It occurs only in compressive loading situations.

D. It causes shear deformation in a material.

B. It can cause elongation or compression of a material

21. Which material property refers to the ability of a material to resist penetration by a projectile?

A. hardness

B. toughness

C. strength

D. ductility

A. hardness

22. Which of the following is not a function of Higher Thrust to weight ratio

A. Accelerate at shorter time

B. Sustain lift at lower speeds

C. Climb faster

D. Sustain turn rates

B. Sustain lift at lower speeds

23. Payload is the weight of the following items, except:

A. cargo

B. passengers

C. baggage

D. usable fuel

D. usable fuel

24. Which of the following uses a semi-monocoque structure?

A. Fuel tank

B. Fuselage

C. Avionics

D. Propeller

B. Fuselage

25. Changes in the center of pressure of a wing affect the aircraft's

A. Lift to drag ratio

B. Drag capacity

C. Lifting capacity

D. Aerodynamic balance and controllability

D. Aerodynamic balance and controllability

26. What isn't a centroid in mathematics?

A. The center point of a circle

B. The point where two lines intersect

C. The point of intersection of the diagonals of a polygon

D. The point of intersection of the medians of a triangle

B. The point where two lines intersect

27. These systems relieve the pilot of the need to maintain constant pressure on the flight controls.

A. trim systems

B. autopilot systems

C. secondary control systems

D. relief systems

A. trim systems

28. A car is moving at a constant speed of 60 km/h. What is the tangential component of its velocity?

A. 30 m/s

B. 40 m/s

C. 10 m/s

D. 20 m/s

D. 20 m/s

29. Which material property refers to the maximum stress a material can withstand before permanent deformation or failure?

A. elasticity

B. hardness

C. plasticity

D. yield strength

D. yield strength

30. What is the purpose of a tail rotor in the 'Single-main-rotor' VTOL configuration?

A. Increase the aircraft's speed

B. Provide additional lift

C. Counteract the torque of the main rotor

D. Improve aerodynamic symmetry

C. Counteract the torque of the main rotor

31. Which communication system is essential for enabling beyond-visual-line-of-sight (BVLOS) operations for UAVs?

A. Satellite communication

B. Radio frequency communication

C. Wi-Fi communication

D. Infrared communication

A. Satellite communication

32. Which material property describes a material's ability to return to its original shape after deformation?

A. elasticity

B. hardness

C. plasticity

D. ductility

A. elasticity

33. Which loading condition occurs when the aircraft wing upper surface experiences lift forces?

A. Compression

B. Tension

C. Shear

D. Torsion

A. Compression

34. Flutter can be prevented by _____ to alter the moment of inertia of the surface.

A. fuel jettisoning

B. mass balancing control surfaces

C. weight reduction

D. pulling back on the control

B. mass balancing control surfaces

35. In the context of HTOL configurations, what is the purpose of using aft-mounted engine(s)?

A. Reduced induced drag

B. Improved gust response

C. Enhanced aerodynamic efficiency

D. Higher span loading for stability

C. Enhanced aerodynamic efficiency

36. A system of two particles is rotating about an axis with a constant angular velocity. If the distance between the particles is increased, what happens to the angular velocity of the system?

A. The angular momentum of the system increases.

B. The angular velocity increases.

C. The angular velocity decreases.

D. The angular velocity remains constant.

C. The angular velocity decreases.

37. A system of two particles is rotating about an axis with a constant angular velocity. If the mass of one of the particles is increased, what happens to the angular momentum of the system?

A. The angular momentum of the system increases.

B. The angular momentum of the system remains constant.

C. The angular momentum of the system decreases.

D. The angular velocity of the system increases.

A. The angular momentum of the system increases

38. A block weighing 100 N rests on a horizontal surface for which the coefficient of static friction is 0.40 and the coefficient of kinetic friction is 0.20. What minimum horizontal force must be applied to move this block?

A. 30 N

B. 20 N

C. 40 N

D. 10 N

C. 40 N

39. In the 'Quad-rotor' VTOL configuration, how are thrust changes achieved for each rotor?

A. By altering the shape of the rotor blades

B. By changing the speed of rotation

C. By changing the pitch of the rotor blades

D. By adjusting the number of rotor blades

B. By changing the speed of rotation

40. Which of the following statements is correct?

A. Maximum range for a propeller driven airplane occurs when the airplane is flying at a velocity such that Cl/Cd is maximum

B. Maximum endurance for a propeller driven airplane occurs when the airplane is flying at maximum power required

C. Maximum range for a propeller driven airplane occurs when the airplane is flying at a velocity such that Cl^3/2/Cd is maximum

D. None statement provided is correct

A. Maximum range for a propeller driven airplane occurs when the airplane is flying at a velocity such that Cl/Cd is maximum

41. Low aspect ratio means

A. HIGH LIFT-CURVE SLOPE, HIGH WING WEIGHT

B. LOW LIFT-CURVE SLOPE, LOW WING WEIGHT

C. HIGH LIFT-CURVE SLOPE, LOW WING WEIGHT

D. LOW LIFT-CURVE SLOPE, HIGH WING WEIGHT

B. LOW LIFT-CURVE SLOPE, LOW WING WEIGHT

42. What is the main objective of UCAV (Unmanned Combat Air Vehicle) in advanced strike missions?

A. Conducting long-endurance missions

B. Maintaining stealth

C. Achieving high-speed flight

D. Maximizing payload capacity

B. Maintaining stealth

43. Which material property describes the ability of a material to transmit electricity?

A. magnetism

B. electromagnetism

C. conductivity

D. electricity

C. conductivity

44. Defined as the work performed per unit of time.

A. Frequency

B. Power

C. Angular velocity

D. Torque

B. Power

45. A nose heavy aircraft has its center of lift to the _____ of the CG.

A. side

B. rear

C. same location

D. front

B. rear

46. A wing slat is a movable airfoil attached to the leading edges of high-performance airplane wings. Their purpose is to:

A. Reduce stalling speed

B. Increase speed on take-off

C. Replace flaps

D. Act as a dive brake or speed brake

A. Reduce stalling speed

47. How does the CG envelope affect an aircraft's payload?

A. It determines the maximum payload that can be carried.

B. It determines the amount of fuel to be burned.

C. It determines the number of flight crew on board.

D. It has no effect on payload.

A. It determines the maximum payload that can be carried

48. Can the centroid of a triangle lie outside the triangle?

A. Yes, it can be located anywhere in the plane

B. It depends on the specific triangle

C. Only if the triangle is equilateral

D. No, it always lies inside the triangle

D. No, it always lies inside the triangle

49. These devices are useful when a control surface may require excessive force to move only in the final stages of travel.

A. Balance Tab

B. Spring Tab

C. Rudder

D. Antiservo Tab

B. Spring Tab

50. How do you calculate the reactions at the supports of a beam?

A. Use the three conditions for static equilibrium.

B. Use the principle of superposition.

C. Use the method of virtual work.

D. All of the above.

A. Use the three conditions for static equilibrium