Engineering Graphics CTBT-ESC-103

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Questions and Answers

Which size of drawing sheet is commonly recommended for drawing practice?

A1 size

A2 size (correct)

A0 size

B4 size

What feature distinguishes a T-square from other drawing tools?

It can draw angles of 30° and 60°.

It is equipped with a scale screw.

It has a T-shaped structure allowing for straight horizontal lines. (correct)

It is used to draw curves and arcs.

What is the primary purpose of a mini drafter in engineering graphics?

To cut drawing sheets to size.

To draw parallel, inclined, and perpendicular lines quickly. (correct)

To draw circular arcs.

To measure distances accurately.

Which of the following components is NOT part of a drafter?

Ebony strip Signup and view all the answers

What is the function of set squares in drawing?

To draw and measure angles. Signup and view all the answers

Which drawing board size is advised for engineering students?

D2 size Signup and view all the answers

How are the edges of a protractor typically utilized?

To measure angles. Signup and view all the answers

What material are set squares typically made from?

Transparent acrylic Signup and view all the answers

What grades of pencils are recommended for technical drawing?

H, 2H, and HB Signup and view all the answers

What is the primary function of a pencil sharpener?

To mend the pencils by removing the wooden shell Signup and view all the answers

Which of the following items is used to erase unwanted pencil drawings?

Eraser Signup and view all the answers

For what purpose is a circle template primarily used?

To draw circles of different radii quickly Signup and view all the answers

What is the recommended size orientation for drawing sheets, excluding A4 size?

Horizontally Signup and view all the answers

How are drawing sheets typically fixed on the drawing board?

Using drawing clips, pins, or adhesive tape Signup and view all the answers

What is a key feature of a sheet container?

It is made of plastic with a detachable lid Signup and view all the answers

What should be preferred when placing a drawing board on a table?

An adjustable inclined surface Signup and view all the answers

What should be avoided when dimensioning a drawing?

Placing dimensions in hidden lines Signup and view all the answers

How should dimensions be presented to avoid redundancy?

Each dimension should only be stated once Signup and view all the answers

When two extension lines are very close together, what dimensional marking method can be used?

Use arrowheads touching the outsides of the extension lines Signup and view all the answers

What is the recommended distance for dimension lines from object lines?

6 – 8 mm Signup and view all the answers

What is the proper way to manage dimensions if the space between two consecutive dimensions is too narrow?

Use a dot to replace two intermediate arrowheads Signup and view all the answers

What is the recommended height for titles in a pencil drawing?

10 mm Signup and view all the answers

Which ratio is most commonly followed for height-to-width in letters?

7 : 5 Signup and view all the answers

How is the height of lowercase letters determined in relation to capital letters?

0.7 times the height of capital letters Signup and view all the answers

What is the standard inclination angle for sloped letters?

75° Signup and view all the answers

What should the spacing between words typically equal?

The height of the letters Signup and view all the answers

How is the height of a fraction’s numerator and denominator calculated?

3/4 the height of the non-fractioned number Signup and view all the answers

Why is dimensioning important in a drawing?

A drawing without dimensions is meaningless Signup and view all the answers

What is the purpose of an extension line in dimensioning?

It is drawn perpendicular to an object line Signup and view all the answers

What is the purpose of drawing margins on a sheet?

To prevent damage to the actual drawing due to spoilage Signup and view all the answers

Which tool is not suggested for sharpening a pencil?

Pencil lead cutter Signup and view all the answers

Where is the title block typically located on a drawing sheet?

Bottom right corner Signup and view all the answers

When using a compass, which situation does not require its use?

Creating straight lines Signup and view all the answers

Which grade of pencil is generally advisable to use for precise drawings?

HB Signup and view all the answers

What method can be used to fix the top left corner of the sheet in place?

Applying adhesive tape Signup and view all the answers

What angle can be achieved using set-squares in conjunction with a T-square?

Common angles like 15°, 30°, and 45° Signup and view all the answers

What practice should be avoided to maintain the quality of a drawing?

Overdrawing on lines or circles Signup and view all the answers

Study Notes

Drawing Instruments and Accessories

Drawing Sheets and Papers: Standard sizes recommended by BIS; A2 and A1 sizes commonly used for engineering practices.
Drawing Board: Supports drawing sheets; made of soft wooden platens with a hard ebony strip along one edge; recommended size for students is D2 (650 mm x 470 mm).
Drafter: Portable tool for drawing parallel and inclined lines, consists of scale, scale screw, steel bars, and clamping mechanism; mounted at the top left corner of the drawing board.
T-square: T-shaped tool for drawing horizontal lines; made of a stock and blade at right angles; inner edge is smooth for accuracy.
Set Squares: Two types - 45° and 30°-60°; made of transparent acrylic with right angles for drawing various angles.
Protractor: Measures and draws angles; can be separate or integrated into a set-square.
Compasses: Used to draw circles; available in large and small sizes for different precision requirements.
Pencils/Lead Pens: Selected based on grades for drawing quality; recommended grades are H, 2H, and HB.
Pencil Sharpener: Used to sharpen pencils, alternative to using a penknife.
Eraser: Non-dusting, high-quality eraser recommended for clean corrections.
Circle Template: Transparent acrylic used for drawing circles with diameters ranging from 2 mm to 30 mm.
Drawing Clips, Pins, and Adhesive Tape: Used to secure sheets on the drawing board; clips clamp corners, pins and tape fix securely to the board.
Sheet Container: Plastic container with a detachable lid for storing and transporting drawing sheets.

Practical Lessons

Clamping a Drawing Sheet: Position a drawing board on a sturdy surface; secure the drawing sheet horizontally with clips, and adjust a drafter for accurate line drawing.
Preparing the Pencil: Use a penknife or sharpener for mending pencils; ensure a sharp tip for precise drawing.
Using Set-squares: Combine with a T-square for creating various angles; allows flexibility in drawing lines.

Drawing Margins and Title Block

Margins: Protects edges of the drawing; prevents damage during handling.
Title Block: Located at the bottom right; standardized dimensions and spacing for clear identification of the drawing.

Tips for Good Quality Drawing

Pencil Maintenance: Regularly sharpen to maintain a fine point; use recommended grades to achieve desired line quality.
Drawing Technique: Complete lines in one stroke; avoid excessive erasing; maintain consistent letter heights for legibility.
Lettering Guidelines: Follow BIS standard heights for lettering based on drawing size; use sized lettering for titles and dimensions appropriately.

Dimensioning

Importance of Dimensioning: Provides clarity on the size of objects; necessary for interpreting technical drawings.
Dimension Elements: Includes extension lines, dimension lines, leader lines, and arrowheads for clear communication of measurements.
Dimensioning Best Practices: Avoid redundancy; ensure clarity by spacing dimension lines adequately; avoid dimensioning hidden lines.

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Description

This quiz covers the basics of engineering graphics, focusing on drawing instruments and accessories. It includes information about standard drawing sheets and papers, which are essential for creating accurate technical drawings. Understand the sizes and standards recommended by the Bureau of Indian Standards (BIS) for effective engineering design.