Engineering Graphics Essentials | Original Multiple-Choice
Practice Questions & Answers Study Guide
Master technical drawing and spatial visualization with these original multiple-choice
practice questions built for Engineering Graphics Essentials. Features high-yield
problems, verified answers, and clear geometric explanations covering orthographic
projection, section views, dimensioning rules, and 3D CAD modeling concepts.
1. In third-angle projection, where is the top view placed relative to the front
view?
A) Below the front view
B) To the right of the front view
C) Above the front view
D) To the left of the front view
Rationale: In third-angle projection, the top view is placed above the front view because
the projection plane is located between the observer and the object. This is the standard
convention used in the United States and Canada.
2. In first-angle projection, where is the top view placed relative to the front view?
A) Below the front view
B) Above the front view
,C) To the right of the front view
D) To the left of the front view
Rationale: In first-angle projection, the object is placed between the observer and the
projection plane. The top view appears below the front view. This convention is used in
Europe and most of Asia.
3. Which line type is used to represent edges that are hidden from view?
A) Continuous thick line
B) Dashed line
C) Chain line
D) Phantom line
Rationale: Hidden lines (also called dashed lines) represent edges, surfaces, or corners
that are not visible from the current viewing angle but exist on the object. They are drawn
as short dashes with consistent gaps.
4. What is the correct order of precedence when a visible line and a hidden line
overlap?
A) Visible lines take precedence over hidden lines
B) Hidden lines take precedence over visible lines
C) Center lines take precedence over both
,D) Phantom lines take precedence over both
Rationale: The standard order of precedence is: visible lines first, then hidden lines, then
center lines. When two line types coincide, the higher-precedence line is drawn.
5. What is the purpose of a center line in an engineering drawing?
A) To show the outline of the object
B) To indicate the axis of symmetry or the center of circular features
C) To show hidden edges
D) To indicate a cutting plane
Rationale: Center lines (thin chain lines with long and short dashes) indicate axes of
symmetry, centers of circles, and bolt circle diameters. They are essential for dimensioning
circular features.
6. Which pictorial drawing shows all three dimensions at equal angles of 120
degrees?
A) Oblique
B) Isometric
C) Perspective
D) Dimetric
, Rationale: In an isometric drawing, the three principal axes are equally foreshortened and
separated by 120 degrees. Isometric drawings are the most common type of axonometric
projection used in engineering.
7. In an oblique drawing, which plane is parallel to the projection plane?
A) The top plane
B) The side plane
C) The front plane
D) The inclined plane
Rationale: In an oblique projection, the front face of the object is drawn parallel to the
projection plane (true shape and size), while receding lines are drawn at an angle (usually
30, 45, or 60 degrees).
8. What is the primary advantage of a perspective drawing over an isometric
drawing?
A) Easier to draw
B) It shows the object as the human eye would see it
C) It uses parallel projection lines
D) It shows true size and shape
Practice Questions & Answers Study Guide
Master technical drawing and spatial visualization with these original multiple-choice
practice questions built for Engineering Graphics Essentials. Features high-yield
problems, verified answers, and clear geometric explanations covering orthographic
projection, section views, dimensioning rules, and 3D CAD modeling concepts.
1. In third-angle projection, where is the top view placed relative to the front
view?
A) Below the front view
B) To the right of the front view
C) Above the front view
D) To the left of the front view
Rationale: In third-angle projection, the top view is placed above the front view because
the projection plane is located between the observer and the object. This is the standard
convention used in the United States and Canada.
2. In first-angle projection, where is the top view placed relative to the front view?
A) Below the front view
B) Above the front view
,C) To the right of the front view
D) To the left of the front view
Rationale: In first-angle projection, the object is placed between the observer and the
projection plane. The top view appears below the front view. This convention is used in
Europe and most of Asia.
3. Which line type is used to represent edges that are hidden from view?
A) Continuous thick line
B) Dashed line
C) Chain line
D) Phantom line
Rationale: Hidden lines (also called dashed lines) represent edges, surfaces, or corners
that are not visible from the current viewing angle but exist on the object. They are drawn
as short dashes with consistent gaps.
4. What is the correct order of precedence when a visible line and a hidden line
overlap?
A) Visible lines take precedence over hidden lines
B) Hidden lines take precedence over visible lines
C) Center lines take precedence over both
,D) Phantom lines take precedence over both
Rationale: The standard order of precedence is: visible lines first, then hidden lines, then
center lines. When two line types coincide, the higher-precedence line is drawn.
5. What is the purpose of a center line in an engineering drawing?
A) To show the outline of the object
B) To indicate the axis of symmetry or the center of circular features
C) To show hidden edges
D) To indicate a cutting plane
Rationale: Center lines (thin chain lines with long and short dashes) indicate axes of
symmetry, centers of circles, and bolt circle diameters. They are essential for dimensioning
circular features.
6. Which pictorial drawing shows all three dimensions at equal angles of 120
degrees?
A) Oblique
B) Isometric
C) Perspective
D) Dimetric
, Rationale: In an isometric drawing, the three principal axes are equally foreshortened and
separated by 120 degrees. Isometric drawings are the most common type of axonometric
projection used in engineering.
7. In an oblique drawing, which plane is parallel to the projection plane?
A) The top plane
B) The side plane
C) The front plane
D) The inclined plane
Rationale: In an oblique projection, the front face of the object is drawn parallel to the
projection plane (true shape and size), while receding lines are drawn at an angle (usually
30, 45, or 60 degrees).
8. What is the primary advantage of a perspective drawing over an isometric
drawing?
A) Easier to draw
B) It shows the object as the human eye would see it
C) It uses parallel projection lines
D) It shows true size and shape
