Basic Engineering Drawing MCQ Quiz - Objective Question with Answer for Basic Engineering Drawing - Download Free PDF

Explanation:

The symbol given in the question is used for shower head.

Explanation:

Recommended sizes of letters and numerals are 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.
• The head (stock) of the T-square is made out of wood/celluloid.

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

Explanation:

Types of the Oblique Projection

1 Cavalier projection

2 Cabinet projection

The oblique projection is based on scales by which the receding lines are drawn.

When the receding lines are drawn to full-size scale and the projection inclined at an angle of 30^o,45^o,60^o to the plane of projection. Such oblique projection is known as cavalier projection. The inclined lines in an oblique projection are called receding lines.

If the receding lines are drawn to a half-size scale such oblique projection is known as the cabinet projection.

Oblique drawings drawn to 1:1 are called cavalier projections.

Additional InformationTypes of Projections are as follows: 

Explanation:

When a rectangle is rotated around one of its sides, the result is a cylinder.
A cylinder consists of:
Two circular bases: Formed by the rotation of the rectangle's width.
Curved surface: Formed by the rectangle’s length during rotation.
Additional InformationSphere: Formed by rotating a circle around its diameter.

Cone: Formed by rotating a right triangle around one of its legs.

Prism: Does not involve rotation but extrusion of a polygon along a straight path.

Explanation:

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

Explanation:

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.

Explanation:

• Drawing instruments and aids are tools used in various fields, such as engineering, architecture, and design, to create accurate and precise drawings.
• These tools assist in producing detailed and scaled representations of objects or plans.
• Common drawing instruments and aids include:

1. Drawing Board: A flat surface on which paper is placed for drawing. It often has a parallel motion or drafting machine for straight lines.
2. T-Square: A T-shaped ruler is used in combination with a drawing board to create horizontal and vertical lines.
3. Drafting Compass: A tool for drawing circles and arcs with a fixed or adjustable radius.
4. Set Square (Triangle): Triangular rulers used for drawing angled lines. They come in various angles, such as 30°, 45°, and 60°.
5. Protractor: A circular tool for measuring and drawing angles.
6. Scale Rule: A ruler with multiple scales for measuring distances on drawings and making scaled drawings.
7. Templates: Pre-drawn shapes (circles, rectangles, etc.) that can be traced for consistency in technical drawings.
8. Drawing Pencils, sheets, and Erasers: Different pencils for various line weights, different sizes of sheets, and erasers for corrections.
9. French Curves: Templates with curved edges for drawing complex curves.

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.
• The head (stock) of the T-square is made out of wood/celluloid.

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

Explanation:

The set square is made up of 3 straight surfaces.

Additional Information

Set Squares:

• They are made of transparent celluloid plastic.
• They are two in numbers each having one corner with 90°.
• The set square with 60° - 30° of 250 mm long and 45° of 200 mm long.
• The set-squares are used for drawing all straight lines except the horizontal lines which are usually drawn with T-square.
• The perpendicular lines or the lines at 30°, 60° and 90° to the horizontal can be drawn by using the set-squares as shown in Fig

• The perpendicular lines or the lines inclined at 45° and 90° to the horizontal can be drawn by using the set-squares.

• By using two set-squares, angles of 15°, 75° and 105° can be drawn as shown in Fig

• In general, set-squares are used to draw angles of 15°, 30°, 45°, 60°, 75°, 90°, i.e, any multiples of 15
• The set-squares can also be used for drawing parallel and perpendicular lines to any given line

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:

Quadrant:

• Part of a circle with radii making 90o with each other is a quadrant (one fourth of the circle).

Additional Information

Circle:

• Circle is a plane figure bound by a curve, formed by the locus of a point which moves so that it is always at a fixed distance from a stationary point the "Centre".

Diameter:

• The length of a straight line between two points on the curve, passing through the centre is called the "Diameter", D: Dia or d. It is twice the radius.

Sector:

• It is part of a circle bounded by two radii (plural of radius) meeting at an angle and an arc.

Circumference:

• It is the linear length of the entire curve, equal to π D

Arc:

• A part of the circle between any two points on the circumference or periphery is called an 'Arc'.

Chord:

• A straight line joining the ends of an arc is called the chord. (Longest chord of the circle is the diameter)

Radius:

• The distance from the centre to any point on the circle is called the "Radius".

Segment:

• A part of the circle or area bound by the arc and chord is the segment of the circle.

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:

Dimensioning of lettering type 'A':

In lettering A type the height of the capital letter is divided into 14 parts.

Additional Information

Dimensioning of lettering type 'B':

• In lettering B type the height of the capital letter is divided into 10 parts.
• According to the Bureau of Indian Standards the range of nominal size of letters has been specified as follows: 1.8 m, 2.5 mm, 3.5 mm, 5 mm, 7 mm, 10 mm, 14 mm and 20 mm.
• Space between the lines is 3/10 h (height of capital letters).
• Space between the words may be equal to the width of the alphabet M or 3/5 h (height of capital letters).
• Drawing title is written in 7 mm size.
• Drawing numbers, title block, and letters denoting the cutting planes and sections are written in 10 mm size.