AMT 280 EXAM 1 COMPREHENSIVE
QUESTIONS AND CORRECT ANSWERS
◉ Purpose of a Block Diagram
Answer: Used to simplify the explanation of complex circuits. Mainly
used for electronic circuits, but can be used for any type of aircraft
system.
◉ Function of Schematic Diagram
Answer: Used to explain a system. A Schematic shows the functional
location of components within a system.
◉ When may shop sketches be used?
Answer: Anything from a simple line drawing to a complex and
detailed drawing. Used when an illustration is necessary to convey
technical information.
◉ What is perspective drawing?
Answer: Parallel lines are shown as converging. Foreshortening.
Various parts of the aircraft are not drawn to true scale
◉ Isometric view vs Perspective view
,Answer: Isometric view has less optical illusion than the perspective
view. In Isometric the object appears distorted but shows equal
distances on the subject and drawing, making it more clear .
◉ Orthographic Projection
Answer: The projections of points on a plane by straight lines at
right angles to the plane. Presented without distortion
◉ Types of Lines used for drawings
Answer: Most drawings use three widths: Wide, medium, and
narrow.
Visible Outline: medium-to-wide line which should be the
outstanding feature of the drawing. Edges and surfaces that can be
seen when an object is viewed directly
Invisible outline (Hidden Line): medium width line made of short
dashes, represents edges and surfaces behind the surface being
viewed.
Canter Line: Narrow or thin, alternating long and short dashes.
Shows the location of the center of a hole, rod, symmetrical part, or
symmetrical section of a part.
,◉ What is a detail view
Answer: Shows only the portion of the object but in greater detail
than principal view. Larger scale.
◉ CAD/CAM Uses in aviation
Answer: CAD: used to design classic two dimensional drawings or
simulate three dimensional objects. CAD assists in the creation of
engineering drawings.
◉ 5 Types of Stress
Answer: Tension
Compression
Torsion
Shear
Bending
◉ Elasticity vs Plasticity of a material
Answer: Plasticity: Ability of a material to be deformed without
rupture or failure
Elasticity: Ability of a material deform under load and return to its
original shape when the load is removed.
, ◉ Why is aluminum alloy a good structure for aircraft.
Answer: Lightweight and strong while being corrosion resistant.
◉ Properties of aluminum alloy 7075-T6
Answer: Zinc is the major alloying element.
Solution heat treated and artificially aged
◉ Advantages and disadvantages of magnesium?
Answer: One of the lightest materials for its strength.
More subject to corrosion than other metals.
◉ Purpose of beryllium copper
Answer: Used for bearings, bushings, spring washers, diaphragms,
ball cages and others when wear resistance, toughness, strength,
and elasticity are desired.
◉ Criteria for grade A fabric
Answer: Minimum of 80, and maximum of 84 threads in a warp.
◉ How is aluminum alloy marked for identification
Answer: Letters and numbers in rows about 6 in apart.
QUESTIONS AND CORRECT ANSWERS
◉ Purpose of a Block Diagram
Answer: Used to simplify the explanation of complex circuits. Mainly
used for electronic circuits, but can be used for any type of aircraft
system.
◉ Function of Schematic Diagram
Answer: Used to explain a system. A Schematic shows the functional
location of components within a system.
◉ When may shop sketches be used?
Answer: Anything from a simple line drawing to a complex and
detailed drawing. Used when an illustration is necessary to convey
technical information.
◉ What is perspective drawing?
Answer: Parallel lines are shown as converging. Foreshortening.
Various parts of the aircraft are not drawn to true scale
◉ Isometric view vs Perspective view
,Answer: Isometric view has less optical illusion than the perspective
view. In Isometric the object appears distorted but shows equal
distances on the subject and drawing, making it more clear .
◉ Orthographic Projection
Answer: The projections of points on a plane by straight lines at
right angles to the plane. Presented without distortion
◉ Types of Lines used for drawings
Answer: Most drawings use three widths: Wide, medium, and
narrow.
Visible Outline: medium-to-wide line which should be the
outstanding feature of the drawing. Edges and surfaces that can be
seen when an object is viewed directly
Invisible outline (Hidden Line): medium width line made of short
dashes, represents edges and surfaces behind the surface being
viewed.
Canter Line: Narrow or thin, alternating long and short dashes.
Shows the location of the center of a hole, rod, symmetrical part, or
symmetrical section of a part.
,◉ What is a detail view
Answer: Shows only the portion of the object but in greater detail
than principal view. Larger scale.
◉ CAD/CAM Uses in aviation
Answer: CAD: used to design classic two dimensional drawings or
simulate three dimensional objects. CAD assists in the creation of
engineering drawings.
◉ 5 Types of Stress
Answer: Tension
Compression
Torsion
Shear
Bending
◉ Elasticity vs Plasticity of a material
Answer: Plasticity: Ability of a material to be deformed without
rupture or failure
Elasticity: Ability of a material deform under load and return to its
original shape when the load is removed.
, ◉ Why is aluminum alloy a good structure for aircraft.
Answer: Lightweight and strong while being corrosion resistant.
◉ Properties of aluminum alloy 7075-T6
Answer: Zinc is the major alloying element.
Solution heat treated and artificially aged
◉ Advantages and disadvantages of magnesium?
Answer: One of the lightest materials for its strength.
More subject to corrosion than other metals.
◉ Purpose of beryllium copper
Answer: Used for bearings, bushings, spring washers, diaphragms,
ball cages and others when wear resistance, toughness, strength,
and elasticity are desired.
◉ Criteria for grade A fabric
Answer: Minimum of 80, and maximum of 84 threads in a warp.
◉ How is aluminum alloy marked for identification
Answer: Letters and numbers in rows about 6 in apart.
