Engineering drawings are used to communicate technical information about objects, machinery, and structures. They provide precise details on dimensions, materials, and manufacturing methods, ensuring accurate interpretation by engineers, manufacturers, and technicians. These drawings follow strict standards to maintain uniformity and clarity in the industry.
Which type of projection shows an object as if viewed from infinity, with parallel projection lines?
A Isometric
B Orthographic
C Freehand
D Perspective
Orthographic projection represents a 3D object in two or more 2D views (front, top, and side) with parallel projection lines. Unlike perspective projection, it does not show depth distortion, making it ideal for technical drawings. It is widely used in engineering to create accurate representations of objects.
In isometric drawing, at what angle are the axes typically drawn?
A 30°
B 90°
C 45°
D 60°
Isometric drawings use a 3D representation where the horizontal axes are tilted at 30° from the baseline, while the vertical axis remains perpendicular. This allows engineers to visualize objects realistically while maintaining proportionality without perspective distortion. It is commonly used in industrial and product design.
What does CAD stand for in engineering drawing?
A Computer Advanced Drafting
B Computer-Aided Drawing
C Computerized Auto Design
D Computer-Aided Design
CAD (Computer-Aided Design) software is used for creating, modifying, analyzing, and optimizing engineering drawings and models. It increases accuracy, efficiency, and flexibility in designing mechanical parts, buildings, and electrical circuits. Popular CAD software includes AutoCAD, SolidWorks, and CATIA.
What is the main purpose of dimensioning in engineering drawings?
A Adding colors
B Aesthetic improvement
C Specifying size and location
D Increasing complexity
Dimensioning provides essential information about the size, shape, and placement of features in a drawing. It ensures accurate manufacturing and assembly by defining critical distances, angles, and tolerances. Proper dimensioning follows standards such as ISO, ANSI, or ASME to avoid misinterpretation.
Which type of line is used to represent hidden features in a drawing?
A Phantom line
B Center line
C Dashed line
D Continuous line
Hidden lines are represented using dashed lines to show features not directly visible in a particular view. This helps engineers and manufacturers understand the complete shape of an object without needing extra views or sections. These lines are crucial in orthographic and sectional views.
What is a section view used for in engineering drawings?
A Showing internal details
B Creating shadows
C Decoration
D Improving aesthetics
A section view is used to reveal hidden interior details by slicing through an object. It helps engineers and manufacturers understand internal components, such as holes, slots, and cavities, without ambiguity. Section views follow strict hatching rules to differentiate materials and parts.
What is an assembly drawing?
A Text document
B Artistic drawing
C Exploded parts diagram
D Full object representation
An assembly drawing shows how different components fit together in a machine or product. It may include exploded views, section views, and part lists to guide manufacturing and assembly. These drawings are crucial for product documentation, maintenance, and troubleshooting.
What is the purpose of tolerancing in engineering drawings?
A Making drawings complex
B Allowing manufacturing variations
C Increasing cost
D Reducing material usage
Tolerancing specifies acceptable limits for size variations due to manufacturing processes. It ensures that parts fit together properly while considering material expansion, machining errors, and assembly requirements. Geometric dimensioning and tolerancing (GD&T) provides a systematic way to define allowable deviations.
Which type of view is used to show an object from an angle different from standard orthographic projections?
A Blueprint
B Freehand
C Auxiliary
D Perspective
An auxiliary view is used when an object has inclined features that cannot be properly represented in standard orthographic views. It provides a clear and accurate depiction of sloped surfaces, helping in measurement and manufacturing. These views are essential for complex mechanical parts.
What does a blueprint typically contain?
A Dimensions and symbols
B Random images
C Only sketches
D Color shading
A blueprint is a detailed technical drawing containing dimensions, tolerances, symbols, and specifications needed for manufacturing or construction. It follows standard conventions to ensure clarity and accuracy in production processes, reducing errors and misinterpretations.
What is the main purpose of rendering in CAD?
A Reducing file size
B Creating realistic images
C Removing errors
D Increasing processing speed
Rendering in CAD refers to generating a photorealistic image of a 3D model by applying textures, lighting, and materials. It is widely used in product visualization, architectural design, and animation to enhance presentations and client understanding.
Which line type is used to indicate symmetry in a drawing?
A Phantom line
B Hidden line
C Center line
D Construction line
Center lines are used to indicate symmetry and the centers of circles, arcs, or cylindrical features. They are represented as alternating long and short dashes. These lines help in positioning features correctly during design and manufacturing.
What is the purpose of freehand sketching in engineering?
A Quick representation
B Decorative designs
C Creating animations
D Artistic improvement
Freehand sketching is used for quickly visualizing and communicating design ideas without the need for precise tools. Engineers use sketches in the initial stages of design to brainstorm, make modifications, and present concepts before creating formal CAD models or technical drawings.
What is the function of a scale in engineering drawing?
A Increasing complexity
B Creating patterns
C Measuring lengths
D Adding colors
A scale is used to measure and draw objects accurately at different proportions. Engineering drawings often use scales to fit large objects onto standard-sized sheets while maintaining proportionality. Common scales include full scale (1:1), reduced scale (e.g., 1:10), and enlarged scale (e.g., 10:1).