Aircraft Construction, Repair and Modification

Mock Examination – August 2017

Name: _______________________________________________ Score: _____________

Write the letter of the correct answer on the space provided.

_____1. What aluminum alloy designations indicate that the metal has received no hardening or tempering
treatment?
a) 6061-O
b) 7057-T6
c) 3003-F
d) 5052-H36

_____2. What is generally used in the construction of aircraft engine firewalls?

a) Titanium nickel alloy
b) Stainless steel
c) Chrome-molybdenum alloy steel
d) Nickel steel

_____3. Alclad is a metal consisting of:

a) Pure aluminum surface layers on an aluminum alloy core.
b) A homogeneous mixture of pure aluminum and aluminum alloy.
c) Aluminum alloy surface layers and a pure aluminum core.
d) None of the above

_____4. The Society of Automotive Engineers (SAE) and the American Iron and Steel Institute use a numerical
index system to identify the composition of various steels. In the number '4130' designating chromium
molybdenum steel, the first digit indicates the:
a) percentage of carbon in the alloy in hundredths of a percent
b) basic alloying element
c) modification of alloy
d) percentage of the basic element in the alloy

_____5. Ability of a metal to become liquid by the application of heat. Metals are fused in welding. Steels fuse
around 2.600F and aluminum alloys at approximately 1.100F.
a) fusibility
b) liquification
c) casting point
d) boiling point

_____6. The core material of Alclad 2024-T4 is:

a) heat-treated pure aluminum alloy, and the surface material is aluminum alloy
b) strain-hardened aluminum alloy, and the surface material is commercially pure aluminum
c) heat-treated aluminum alloy, and the surface material is commercially pure aluminum
d) commercially pure aluminum, and the surface material is heat-treated aluminum alloy

_____7. The aluminum code number 1100 identifies what type of aluminum?
a) Aluminum alloy containing zinc.
b) 99 percent commercially pure aluminum.
c) Aluminum alloy containing chrome.
d) Aluminum alloy containing 11 percent copper.

_____8. Titanium alloys:

a) Are corrosion resistant but heavy.
b) Are practical for economical use.
c) Are cheap to manufacture.
d) Have a high strength to weight ratio.

_____9. In the four-digit aluminum index system number 2024, the first digit indicates:
a) the number of major alloying elements used in the metal
b) the percent of alloying metal added
c) percentage of basic alloying element in the alloy
d) the major alloying element

_____10. Aluminum alloyed primarily with magnesium is numbered:

a) 1025
b) 5025
c) 2025
d) 7075
_____11. Property of a metal which allows little bending or deformation without shattering. A metal that possesses
______________ is apt to break or crack without change of shape.
a) malleability
b) hardness
c) brittleness
d) ductility

_____12. Refers to the ability of a material to resist abrasion, penetration, cutting action, or permanent distortion.
It may be increased by cold working the metal and, in the case of steel and certain aluminum alloys, by heat
treatment.
a) malleability
b) toughness
c) hardness
d) strength

_____13. Annealing of aluminum:

a) Makes the material brittle.
b) Removes stresses caused by forming.
c) Increases the tensile strength.
d) All of the above.

_____14. The main metal in monel is:

a) Copper
b) Stainless steel
c) Aluminum
d) Nickel

_____15. Why are aluminum alloys used on aircraft, instead of pure aluminum?
a) Corrosion resistant
b) Cheaper
c) Stronger
d) Lighter

_____16. Where is the buttock line or butt line of an aircraft?

a) A height measurement left or right of, and perpendicular to the horizontal centreline
b) A width measurement left of, and perpendicular to the vertical centreline
c) A width measurement left or right of, and parallel to the vertical centreline
d) A height measurement left of, and perpendicular to the vertical centreline

_____17. The process of forming a pure layer of aluminum over an aluminum alloy is:
a) Electroplating
b) Nitriding
c) Metalizing
d) Cladding

_____18. Property that enables a metal to return to its original size and shape when the force which causes the
change of shape is removed. This property is extremely valuable because it would be highly undesirable to have a
part permanently distorted after an applied load was removed.
a) ductility
b) elasticity
c) malleability
d) flexibility

_____19. What is aircraft zone 400?

a) Empennage and body section
b) Powerplants and nacelle struts
c) Right wing
d) Landing gear and gear doors

_____20. Malleable materials are:

a) easy to cast
b) highly ductile
c) easy to forge
d) corrosion resistant

_____21. Pure aluminum is:

a) Not resistant to corrosion.
b) Reasonably resistant to corrosion.
c) Highly resistant to corrosion.
d) None of the above
_____22. What does the 0 in 2024-T3 mean?
a) The alloy has been modified
b) The alloy is solution heat treated and then cold worked
c) The percentage of impurities in the alloy
d) The alloy has not been modified

_____23. What is the purpose of a wing main spar?

a) To withstand bearing and torsional loads.
b) To withstand compressive and torsional loads.
c) To withstand compressive and shear loads.
d) To withstand bending and shear loads

_____24. The dimensions of an MS20430 AD-4-8 rivet are:

a) 1/8 inch in diameter and ¼ inch long
b) 1/8 inch in diameter and ½ inch long
c) 4/16 inch and 8/32 inch long
d) ¼ inch diameter and ½ inch long

_____25. The skin of a modern pressurized aircraft:

a) Is made up of light alloy steel sheets built on monocoque principle
b) Houses the crew and payload
c) Provides aerodynamic lift and prevents corrosion by keeping out adverse weather
d) Is primary load bearing structure carrying much of the structural loads

_____26. Rivet pitch is the distance between the:

a) Centers of rivets in adjacent rows
b) Center of adjacent rivets in the same row
c) Heads of rivets in the same row
d) Center of the rivets on the edge

_____27. An airplane is controlled directionally about its vertical axis by the:

a) Rudder
b) Elevators
c) Ailerons
d) Flaps

_____28. What is aircraft zone 200?

a) Left wing
b) Right wing
c) Upper fuselage
d) Lower fuselage

_____29. MS20470 is a ___________ rivet.

a) Brazier head
b) Universal head
c) Flat head
d) Round head

_____30. What is ATA Chapter 54?

a) Wings
b) Nacelles and Pylons
c) Fuselage
d) Doors

_____31. An airframe structure must remain substantially intact after experiencing

a) The design ultimate load times a 1.5 safety factor
b) The design limit load plus the design ultimate load
c) Three times the safety factor
d) The design limit load times a 1.5 factor of safety.

_____32. A cantilever wing:

a) Is externally braced with either struts and/or bracing wires
b) Is supported at one end only with no external bracing
c) Has both an upper and lower airfoil section
d) Folds at the root section to ease storage in confined spaces

_____33. Most rivets used in aircraft construction have:

a) Smooth heads without markings
b) Dimples
c) A raised dot
d) A raised cross
_____34. The purpose of the vertical fin is to provide:
a) Directional stability
b) Longitudinal stability
c) Lateral stability
d) Gliding stability

_____35. Which part of the 2017-T36 aluminum alloy designation indicates the primary alloying agent used in its
manufacture?
a) 2
b) 17
c) 20
d) T36

_____36. A factor which determines the minimum space between rivets is the:
a) Type of material used
b) Length of the rivets being used
c) Diameter of the rivets being used
d) Thickness of the material being riveted

_____37. Station numbers and water lines:

a) A means of locating airframe structure and components
b) Passenger seat location
c) Runway markings for guiding the aircraft to the terminal
d) Compass alignment markings

_____38. Which part/s of a semi-monocoque fuselage prevent/s tension and compression from bending the
fuselage?
a) The fuselage covering
b) Bulkheads and skins
c) Pressure bulkhead
d) Longerons and stringers

_____39. AN455 is a ___________ rivet.

a) Brazier head
b) Universal head
c) Flat head
d) Round head

_____40. The monocoque fuselage relies largely on the strength of:

a) Longerons and formers
b) Skin or covering
c) Bulkheads and longerons
d) Spars and ribs

_____41. Which rivet is used for riveting magnesium alloy structures?

a) Mild steel
b) 5056 aluminum
c) Copper
d) Monel

_____42. MS20426AD-6-5 indicates a countersunk rivet which has:

a) A shank length of 5/16 inch (excluding the head)
b) A shank length of 5/32 inch (excluding head)
c) An overall length of 5/16 inch
d) An overall length of 5/32 inch

_____43. An airplane wing is designed to produce lift resulting from:

a) Negative air pressure below and above the wing’s surface
b) Negative air pressure below the wing’s surface and positive air pressure above the wing’s surface
c) Positive air pressure below the wing’s surface and negative air pressure above the wing’s surface
d) Positive air pressure above the wing’s surface and negative air pressure below the wing’s surface

_____44. AN430 is a ___________ rivet.

a) Brazier head
b) Universal head
c) Flat head
d) Round head
_____45. Rivet gauge or transverse pitch is the distance between the:
a) Centers of rivets in adjacent rows
b) Center of adjacent rivets in the same row
c) Heads of rivets in the same row
d) Center of the rivets on the edge

_____46. What is the purpose of wing ribs?

a) To withstand the fatigue stresses.
b) To shape the wing and support the skin.
c) To house the fuel and the landing gear.
d) To provide local support for the skin.

_____47. AN442 is a ___________ rivet.

a) Brazier head
b) Universal head
c) Flat head
d) Round head

_____48. In the construction of airframes the primary purpose of frames or formers is to:
a) Provide a means of attaching the stringers and skin panels
b) Oppose hoop stresses and provide shape and form to the fuselage
c) Form the entrance door post
d) Supports the wing
_____49. What is the temper designation for solution heat treated, cold worked and then artificially aged?
a) T5
b) T8
c) T7
d) T6

_____50. An airplane is controlled directionally about its vertical axis by the:

a) Rudder
b) Elevators
c) Ailerons
d) Flaps

Prepared by:

Engr. Sonny Y. Cac Jr.

PRC Lic No. 0001430
CAAP Lic. No. 135754-AMT

“Seek first the kingdom of God and His righteousness, and all these things shall be added unto you.” – Matthew 6:33