In this article we discuss 20 technical questions on the concept of Engineering drawing instruments and materials.
These technical Questions are very useful while attending an interview.
They also help to understand the concept much better.
Here are the 20 technical questions.
1. What is the purpose of a drawing board in engineering drawing?
The purpose of a drawing board in engineering drawing is to provide a stable, flat surface for accurately creating and drafting technical drawings. It ensures precision by keeping the paper secure and level while drawing, enabling clear and accurate work.
2. Explain the use of a T-square in technical drawing.
A T-square is used in technical drawing to draw horizontal lines and as a guide for drawing vertical lines when combined with other instruments. It ensures accuracy and alignment, providing a straight edge to maintain proper angles and precision in the drawing.
3. What is the function of a set square in engineering drawing?
A set square is used in engineering drawing for drawing straight lines at specific angles, typically 30°, 45°, 60°, and 90°. It helps in creating accurate geometric shapes, parallel lines, and perpendicular lines.
4. How is a protractor used in engineering drawing?
A protractor is used in engineering drawing to measure and construct angles accurately. It helps in marking specific angles, checking existing angles, and ensuring precision in technical drawings.
5. What is the role of a compass in drawing?
A compass is used in drawing to create precise circles, arcs, and curves. It helps in marking equidistant points and transferring measurements accurately in technical and engineering drawings.
6. What is the difference between a hard and soft pencil, and how do they affect engineering drawings?
Hard pencils (H grades) produce thin, light lines, ideal for technical details and precise construction lines in engineering drawings. Soft pencils (B grades) create dark, thick lines, useful for shading and emphasizing final outlines. Hard pencils enhance accuracy, while soft pencils improve visibility.
7. How do you use a divider in engineering drawing?
A divider is used in engineering drawing to measure and transfer distances accurately. It helps in dividing lines, marking equal segments, and comparing dimensions directly from a scale or another part of the drawing.
8. What is the significance of a scale in engineering drawings, and how is it used?
A scale in engineering drawings is used to represent large objects accurately on a smaller sheet while maintaining proportion. It helps in measuring and drawing objects to a specific ratio, ensuring precision and consistency in technical designs.
9. Why are different grades of pencils (e.g., H, B, 2H) important in engineering drawing?
Different pencil grades are important in engineering drawing for varying line quality and precision. Hard pencils (e.g., 2H, 3H) produce thin, light lines for construction and guidelines, while soft pencils (e.g., B, 2B) create dark, thick lines for final outlines and emphasis, ensuring clarity and accuracy in technical drawings.
10. What is a French curve, and when is it used in technical drawing?
A French curve is a drafting tool used to draw smooth, non-circular curves in technical drawings. It is used when creating irregular or complex curved shapes that cannot be drawn with a compass.
11. How does a drawing template help in technical drawing?
A drawing template helps in technical drawing by providing pre-cut shapes, symbols, and standard forms, ensuring accuracy, consistency, and efficiency in creating repetitive elements like circles, ellipses, and symbols.
12. What is the purpose of an eraser shield, and when is it necessary in engineering drawing?
An eraser shield is used in engineering drawing to erase specific areas without affecting surrounding details. It is necessary for precise corrections in detailed or complex drawings, ensuring accuracy and cleanliness.
13. What are the uses of a bevel protractor in technical drawing?
A bevel protractor is used in technical drawing to measure and transfer angles accurately. It helps in setting or checking angles, especially when precise angular measurements are required for parts or components in engineering designs.
14. What is the difference between a plain scale and a diagonal scale in engineering drawing?
A plain scale is used to measure distances directly in a single unit of measurement, often in a simple ratio. A diagonal scale allows for more precise measurements by dividing the scale into smaller increments, useful for reading fractional values and representing multiple units of measurement in a single scale.
15. What is the function of a parallel ruler in technical drawing?
A parallel ruler is used in technical drawing to draw parallel lines accurately. It slides along two fixed rails, ensuring that lines remain parallel while maintaining consistent spacing in geometric and architectural designs.
16. What types of paper are typically used for engineering drawings, and why?
Typically, tracing paper and Bristol board are used for engineering drawings. Tracing paper is ideal for detailed, precise work and can be easily reproduced, while Bristol board provides a smooth surface for sharp, clear lines and durability. Both types ensure accuracy and clarity in technical drawings.
17. Explain the use of tracing paper in technical drawing.
Tracing paper is used in technical drawing for making precise copies of original drawings, allowing for easy revisions or layering of details. Its transparency enables designers to trace over existing work while maintaining clarity and accuracy.
18. What is the importance of using ink for final lines in engineering drawings?
Using ink for final lines in engineering drawings ensures clarity, permanence, and precision. Inked lines are more durable, resistant to fading, and provide a clean, professional finish, making the drawing suitable for reproduction, storage, and long-term use.
19. How do you choose between mechanical pencils and traditional pencils in engineering drawings?
Mechanical pencils are preferred in engineering drawings for their consistent line thickness, precision, and convenience. Traditional pencils offer more versatility in line shading and are easier to sharpen but may lack the fine control needed for detailed work. The choice depends on the specific drawing requirements and personal preference.
20. Why is it necessary to use drafting tape or drafting dots in engineering drawing?
Drafting tape or drafting dots are used in engineering drawing to securely hold the paper in place without damaging it. They prevent shifting while drawing, ensuring accuracy, and are easily removable without leaving residue or tearing the paper.
Also Read :
- BIS and ISO standards.
- Lines , Lettering and dimensioning-Technical Questions.