What is the purpose of geometric dimensioning and tolerancing (GD&T)?
A Represent angles
B Show measurements
C Control part variations
D Indicate material type
Geometric dimensioning and tolerancing (GD&T) is used to define the allowable variations in size, shape, and location of features on a part. It helps ensure that parts fit and function correctly, even with manufacturing tolerances.
What does a dashed line represent in engineering drawings?
A Hidden features
B Construction references
C Visible edges
D Center axis
Dashed lines in technical drawings represent features that are not visible in the current view, such as internal holes, edges, or components. They are critical for showing the complete structure of the part, even those features hidden from view.
What is the purpose of using scales in technical drawings?
A Represent real size
B Display detailed textures
C Reduce cost
D Show proportional size
Scales are used to represent the size of an object at a proportionate reduction or enlargement. This allows large objects to be drawn on standard paper sizes while maintaining their real-world proportions for measurement and construction.
Which type of line is used to show the boundary of an object in a drawing?
A Continuous line
B Hidden line
C Center line
D Phantom line
Continuous lines are used to represent the visible edges or boundaries of an object. They clearly define the shape and limits of the part, helping to accurately communicate its form and dimensions in technical drawings.
What is the function of a leader line in engineering drawings?
A Connect part labels
B Show dimensions
C Indicate cutting planes
D Represent center axis
Leader lines are used to point to specific features or components in a drawing, connecting labels, symbols, or notes to the relevant part of the object. They help make the drawing clearer and ensure the correct interpretation of details.
What is the primary use of a hidden line in technical drawings?
A Show internal features
B Indicate symmetry
C Represent part boundaries
D Display assembly instructions
Hidden lines represent features that are not visible in the current view, such as internal cavities, holes, or grooves. These lines are critical for fully understanding the design, as they show components that may be hidden in other views.
Which type of projection is used to create a 2D representation of a 3D object without distortion?
A Orthographic projection
B Isometric projection
C Perspective projection
D Exploded view
Orthographic projection shows 3D objects in 2D, using multiple views like front, top, and side, without perspective distortion. It provides precise dimensions and clear representation of an object’s geometry, making it ideal for technical and engineering drawings.
What does the scale 1:5 in an engineering drawing represent?
A 5 times larger
B Actual size
C 5 times smaller
D 10 times smaller
A scale of 1:5 means that the object in the drawing is represented at one-fifth of its actual size. This is commonly used for large objects that need to be represented on smaller sheets, maintaining the correct proportions.
Which type of view is used to show the exact size and shape of an object from above?
A Isometric view
B Side view
C Plan view
D Front view
The plan view represents the object as seen from above, showing its layout and the relationships between its top-facing features. It is typically used to represent floor plans or the top of a machine or assembly.
What does a centerline represent in a drawing?
A Cutting plane
B Symmetry or axis
C Hidden feature
D Visible edge
Centerlines are used to represent the axis of symmetry for circular or cylindrical features and to show the center of holes. These lines help with aligning components and ensuring symmetrical assembly or manufacturing processes.
What type of projection shows an object in a realistic form, with perspective depth?
A Isometric projection
B Orthographic projection
C Perspective projection
D Auxiliary view
Perspective projection creates a visual effect where lines converge toward a vanishing point, mimicking how the human eye perceives depth. This view is commonly used in architectural design and product visualizations to create a realistic 3D appearance.
What is the function of a cutting plane line in a sectional view?
A Indicate the view angle
B Represent dimensions
C Indicate part boundaries
D Show direction of view
The cutting plane line shows where the object is “cut” to reveal its internal features in a sectional view. It helps clarify the perspective from which the sectioned object is viewed, and often has arrows to indicate direction.
What is the purpose of using tolerance in technical drawings?
A Represent part color
B Allow variations in dimensions
C Show material type
D Indicate part movement
Tolerances define the allowable range of variation in a dimension. They are crucial in ensuring that parts fit and function together even when there are small manufacturing variations. This flexibility ensures parts remain usable without requiring perfect precision.
What does a dimension line represent in an engineering drawing?
A Measurement of features
B Center of holes
C Symmetry of object
D Visible edges
Dimension lines are used to show the measurements of an object’s features, such as length, width, height, and angles. These lines ensure that parts are made to the correct size and proportions, essential for the manufacturing process.
Which line type is used to indicate a part’s center or axis in a technical drawing?
A Center line
B Continuous line
C Hidden line
D Phantom line
Center lines represent the axis of symmetry for circular and cylindrical parts. They are essential for ensuring the accurate alignment and positioning of parts in a design, helping with the manufacturing and assembly of components that need to be centered.