Drawing Instruments MCQ Quiz in मराठी - Objective Question with Answer for Drawing Instruments - मोफत PDF डाउनलोड करा

Explanation:

Protractor:

• It is used to draw and measure angles.
• It is made of transparent celluloid plastic, available in semi-circle or circle.

Additional Information

The list of drawing instruments, equipment and materials is as follows:

Instruments:

• Drawing board
• Tee-square or Mini Drafter
• Set-square
• Scale
• Protractor
• French curves
• Stencil
• Drawing instruments box

Equipment:

• Drafting machine
• Computer for Auto CAD. (Monitor UPS, CPU, keyboard, mouse, etc.)
• Plotter/Printer

Materials:

• Drawing papers
• Drawing pencils
• Rubber/ Eraser
• Drawing papers fasteners (Drawing pins, Cello tape)
• Tracing paper or tracing film

Explanation:

High-Grade Drawing Instrument:

• The material of high-grade drawing instruments can vary depending on the specific instrument and its intended use. However, stainless steel is commonly used for high-quality drawing instruments.
• Stainless steel is known for its durability, corrosion resistance, and ability to maintain precise measurements over time.
• It is a popular choice for precision instruments like rulers, compasses, and protractors used in drafting and technical drawing.

Additional Information

Mini-Drafter:

• It is a simple and small shaped instrument of the drafting machine. 
• All the working functions of T-Square, Set-Square, Protractor, Scales and their merits are co-ordinated in a Mini-Drafter.
• The parallelogram bars are shaped like parallelograms, with two pairs of opposite sides that are parallel to each other. The bars are typically made of metal or plastic and are attached to the drafting board with hinges or other mechanisms that allow them to move freely.

Explanation:

The standard size should be as per IS: 1444-1963/1977 of Bureau of Indian Standards as follows:

Explanation:

Drawing Sheet:

1. The size of the drawing sheets to be used depends on the size of the object to be drawn and the scale to be used.
2. The length of the drawing sheet can be horizontal or vertical while drawing.
3. A2 size of drawing sheet is most convenient for drawing purposes in the class room.
4. The width to length ratio of drawing sheet is 1: √2
5. Area of A0 drawing sheet is 1.00 square metre.

Additional Information

The standard size as per Bureau of Indian standard (B.I.S) as follows:

Explanation:

Pencils, Grade, and Selection:

Pencils:

• In the drawing office, standard pencils (lead encased in wood) and semi-automatic pencils are made used.
• Pencil leads are made of graphite with kaolin (clay) of varying proportions to get the desired grades.
• More the kaolin, the higher the hardness.
• The pencil is selected in engineering drawing on the basis of the grade of the pencil. 

Grades of pencils:

• Pencils are graded according to the hardness or softness of the lead.
• The hardest pencil is 9H grade and the softest pencil is 7B grade.
• Selection of the grade of pencils depends on the type of line work required and the paper on which it is used.
• Softer lead pencils are used to produce thicker and darker line work, but they wear out quickly.
• Medium grades of H, and 2H are used for general line work as well as for lettering.
• Harder grade leads produce lighter and thinner lines.
• Most construction line work is done with 4H, 5H, and 6H pencil leads, producing thin but also sufficiently dark by exerting pressure.
• Depending upon the individual's touch and the style of writing, the right pencil may be selected.

Selection of pencils:

• Pencil grades vary from one brand to another brand.
• Select the grades of the pencil depending on the type of line work.
• For construction lines, you can choose 2H or 3H, for lettering and object lines grade H pencils.
• In general H, HB, and 2H are used.
• H medium hard
• HB medium soft
• 2H hard

Explanation:

The standard size should be as per IS: 1444-1989 of the Bureau of Indian Standards as follows:

Explanation:

Beam Compass:

• It is a specialized drawing tool used for accurately dividing a line or circle into equal parts.
• It consists of two main components: a beam or bar and two adjustable legs.
• The beam is typically longer than a regular compass and allows for larger spans.
• The adjustable legs can be set at different distances from the center, allowing precise division of a line or circle.

Additional InformationBow compass:

• A bow compass consists of a pivot point, a needle, and two legs with adjustable screws.
• It is named so due to its curved shape resembling a bow.
• The bow compass is used for drawing circles and arcs of various sizes.
• The legs can be adjusted to set the desired radius, and the needle serves as the pivot point for drawing the circle or arc.

Dividers:

• Dividers are another type of compass used in engineering drawing. They consist of two pointed legs with adjustable screws.
• Dividers are primarily used for measuring and transferring distances accurately.
• They can also be used to divide lines or circles into equal parts by adjusting the distance between the two legs.

Vernier compass:

• A vernier compass is a type of compass that incorporates a vernier scale for more precise measurement.
• It consists of a main scale and a sliding vernier scale.
• The vernier scale allows for measurements with greater accuracy compared to regular compasses.

Explanation:

Pencils with Their Uses:

1. 2H: Used for Centre lines – This grade is ideal for light, precise lines that represent the central axis in technical drawings.
2. H: Used for Boundary lines – H pencils are slightly darker than 2H and are commonly used for drawing outlines or boundaries in drawings.
3. HB: Used for Border lines – HB pencils create darker lines, suitable for defining borders in technical or architectural drawings.

Explanation:

The standard size as per Bureau of Indian standard (B.I.S) as follows:

Explanation:

T-square:

• It consists of two parts, a long strip called blade and a short strip called head or stock.
• The blade is fitted with an ebony or plastic piece on its upper edge to form a working edge.

Note:

• T-square is used to draw only horizontal lines.
• Do not use lower edge of the T-square to draw horizontal lines. While drawing horizontal lines, the pencil should be slightly inclined towards the right.
• Vertical and inclined lines are drawn with the help of set squares.

Additional InformationThe following precautions may be taken in handling the T-square:

• When not in use, T-square should be left flat on the drawing board or suspended from the hole at the end of the blade.
• Clean the blade with moist cloth to remove lead particles.
• Do not use T-square as a hammer to drive in the drawing pins etc. 
• Do not use the ebony edge as a straight edge for cutting paper with knife.
• Ensure that the screw heads are tight