What is the purpose of an exploded view in engineering drawings?
A Show internal details
B Show part connections
C Show shape
D Display dimensions
Exploded views separate parts of an assembly to show how they fit together. This view provides clarity on the assembly process by visually representing the relationship and sequence of part connections, often used in assembly instructions.
What type of drawing is used for creating models of curved surfaces?
A Surface modeling
B Solid modeling
C Wireframe modeling
D Freeform sketching
Surface modeling is used in CAD to design complex, curved surfaces. It allows the creation of 3D objects with smooth, continuous surfaces, useful in industries like automotive design and architecture, where precise surface details are important.
Which CAD tool is used to unfold a 3D model into a 2D flat shape?
A Sweep tool
B Loft tool
C Unwrap tool
D Flatten tool
The flatten tool is used in CAD software to unfold 3D shapes into 2D patterns. This technique is especially useful in sheet metal design, as it allows engineers to create a flat layout for manufacturing.
What does sheet metal drawing primarily focus on in engineering design?
A Detailed assembly instructions
B Complex 3D shapes
C Flat pattern for fabrication
D Material specifications
Sheet metal drawing focuses on providing flat patterns for fabrication. These drawings show how a sheet of metal should be cut, bent, or shaped to form the desired 3D part, ensuring accuracy and efficiency in manufacturing.
In an exploded view, how are parts typically arranged?
A Without overlap
B With slight separation
C Fully assembled
D Randomly
In an exploded view, parts are separated slightly along their axes to show how they fit together. This view helps in understanding the assembly sequence and part relationships, which is crucial for both assembly and maintenance.
Which type of drawing is used to show internal details of an object by cutting it in half?
A Exploded view
B Sectional view
C Auxiliary view
D Plan view
A sectional view cuts through an object to show its internal components. This view is vital for understanding hidden features such as holes or ribs, which cannot be seen in standard external views, making the design clearer for manufacturing.
What is the primary goal of using surface modeling in CAD?
A Design basic shapes
B Simplify drawings
C Create complex 3D surfaces
D Add color
Surface modeling allows designers to create intricate and complex curved surfaces, which are essential in industries like automotive and aerospace design. It helps in modeling non-solid bodies like car bodies or aircraft wings with high precision.
What does a tolerance in engineering drawings represent?
A Material type
B Size limitations
C Allowable dimensional variation
D Color variation
Tolerances in engineering drawings define the permissible variation in the dimensions of parts. They ensure that parts can still fit and function together properly even if there are small deviations in their size or shape due to manufacturing processes.
What is the function of a center line in engineering drawings?
A Show hidden parts
B Represent motion
C Indicate symmetry
D Show dimensions
Center lines are used to represent the axis of symmetry for circular or cylindrical parts. They help in aligning features symmetrically and are vital for positioning components correctly during assembly and ensuring accurate machining.
What is the purpose of a part list in assembly drawings?
A Show part location
B Provide material details
C List all components
D Show part dimensions
A part list provides an inventory of all components used in an assembly, including part numbers, descriptions, and quantities. It is essential for identifying parts during assembly and ensuring all components are available for production.
What does an isometric view provide in technical drawings?
A Perspective distortion
B True size and shape
C Proportional 3D appearance
D Detailed interior features
Isometric views give a 3D appearance on a 2D plane where all three axes are equally scaled, typically at 30° angles from the horizontal. This method preserves the proportions of the object without perspective distortion, allowing easy interpretation of its shape.
Which CAD modeling technique involves the sweeping of a 2D shape along a path?
A Extrusion
B Revolving
C Lofting
D Sweeping
Sweeping involves moving a 2D profile along a predefined path to create a 3D shape. This technique is commonly used to model objects like pipes, ducts, and rails, where the shape follows a consistent curve or straight path.
Which type of line is used in technical drawings to represent a cut or sectioning of an object?
A Cutting plane line
B Center line
C Dashed line
D Continuous line
The cutting plane line indicates where a section view has been made through an object. This line is usually drawn as a thick line with arrows, showing the direction of view and where the internal features are revealed in the section view.
What is the role of a reference line in engineering drawings?
A Indicate motion
B Show feature location
C Provide material info
D Indicate symmetry
A reference line is used to locate features and dimensions within a drawing. It serves as a starting point for measurements, ensuring that parts are accurately placed and aligned with respect to other components or features in the design.
What does sheet metal drawing focus on when designing parts?
A Fabrication details
B Decorative elements
C Assembly instructions
D Part proportions
Sheet metal drawings provide essential details on how a flat sheet of metal should be cut, bent, and shaped to create a 3D part. These drawings focus on fabrication processes, such as cutting lines, bending angles, and material thickness, to ensure accurate production.