What is the purpose of an orthographic projection?
A Artistic view
B 3D Representation
C 2D Representation
D Showing details
Orthographic projection is a method to represent a 3D object in two dimensions. It uses multiple views (usually front, top, and side) to show the object without perspective, providing accurate and measurable details for manufacturing and construction.
What type of projection distorts an object’s appearance for realistic effect?
A Perspective
B Isometric
C Exploded
D Orthographic
Perspective projection shows an object with depth and distortion to mimic how the human eye perceives it. Lines converge to a vanishing point, making objects appear smaller as they get farther from the viewer. It is commonly used in architectural visualizations.
Which drawing method is used for a simplified 3D representation of an object?
A Auxiliary
B Assembly
C Sectional
D Isometric
Isometric drawing is a type of axonometric projection where all three axes are equally angled (typically 30° from horizontal), creating a simplified 3D representation without perspective distortion. It is easy to understand and widely used in technical and mechanical drawings.
What is the function of a dimension line in engineering drawing?
A Indicating scale ratio
B Illustrating symmetry
C Denoting measurement
D Showing hidden parts
Dimension lines are used to show the size or length of an object in a drawing. They are accompanied by numerical values to indicate the exact measurement. These lines help engineers and manufacturers create precise parts or structures by specifying exact dimensions.
In a CAD system, which tool is commonly used for creating precise straight lines?
A Freehand tool
B Line tool
C Polygon tool
D Curve tool
The line tool in CAD software is used to create straight lines by specifying two points. It is one of the most basic tools in CAD software, essential for drawing geometric shapes, outlines, and structural elements accurately.
Which type of view is commonly used to show a cut-through of a part to reveal its internal features?
A Exploded
B Section
C Front
D Auxiliary
Section views show a part cut through, revealing internal components or details that are hidden in regular views. These views use hatching or shading to differentiate materials and make it easier for manufacturers to understand internal features.
What is the key advantage of using CAD software over manual drafting?
A More artistic
B Faster to learn
C Higher accuracy
D More creative
CAD software offers enhanced precision and accuracy in drafting compared to manual methods. It eliminates human error in measurements and alignments, making it ideal for creating detailed technical drawings with exact dimensions and geometric constraints.
Which type of drawing shows a mechanical part in an exploded view with all components separated?
A Exploded view
B Isometric
C Assembly
D Section
Exploded view drawings show components of an assembly separated slightly, making it easier to understand how parts fit together. This type of drawing is typically used for assembly instructions, providing clarity on how each component interacts in the final product.
What is the term for a line that defines the boundaries of a feature or part?
A Boundary line
B Visible line
C Construction line
D Center line
Visible lines are solid lines that outline the visible edges of an object in a drawing. They are the most important lines in a technical drawing because they indicate the exterior shape of the part or assembly.
What is the main purpose of using auxiliary views?
A To show different perspectives
B To simplify the drawing
C To represent inclined surfaces
D To highlight hidden features
Auxiliary views are used to show surfaces that are not parallel to the primary projection planes. They are crucial when depicting inclined or slanted surfaces that cannot be accurately represented in standard orthographic views.
Which line type is used to indicate the path of a motion or movement?
A Phantom line
B Dashed line
C Hidden line
D Center line
Phantom lines represent alternative positions of a part or assembly, often used to show the path of motion or movement. They are made up of long and short dashes, helping engineers visualize how parts move or fit together.
In technical drawings, what does the scale 1:2 indicate?
A 1% larger
B Full-size drawing
C Half the size
D Enlarged by 2 times
A scale of 1:2 means that the drawing represents the object at half of its actual size. This scale is used to fit large objects onto smaller sheets, making it easier to represent large parts or assemblies while maintaining accurate proportions.
Which drawing method is used to represent a 3D object in 2D with equal angles between axes?
A Isometric
B Orthographic
C Axonometric
D Perspective
Isometric drawing is a type of axonometric projection where all three axes are drawn at 30° angles to the horizontal plane. It allows for a visual representation of 3D objects on a 2D surface, where the proportions along each axis are maintained.
What type of drawing is used to show an object from a view that is not directly visible?
A Sectional view
B Auxiliary view
C Exploded view
D Isometric view
Auxiliary views are used to depict features that cannot be clearly shown in standard orthographic views. They are especially useful for objects with inclined or slanted surfaces, which need to be shown from a different angle to be understood correctly.
In a technical drawing, what does a center line represent?
A Symmetry
B Hidden features
C Part boundary
D Direction of motion
Center lines are used to indicate the center of symmetrical parts or features. They help in aligning components correctly during manufacturing or assembly. In circular or cylindrical objects, the center line is critical for defining axes of rotation.