Drafting Instruments and its uses 3

Small bow compass can draw circles less than _____ mm diameter

• 25 mm

• 50 mm

• 100 mm

• 150 mm

Answer explanation

A small bow compass is designed for precision and typically can draw circles with a maximum diameter of 50 mm. Therefore, it can draw circles less than 50 mm in diameter, making this the correct choice.

Lengthening bar is used to draw circles of diameter more than:

• 50 mm

• 120 mm

• 150 mm

• 300 mm

Answer explanation

A lengthening bar is specifically designed for drawing larger circles. It is most effective for diameters exceeding 300 mm, making it the correct choice among the options provided.

Which is not true for set squares

• Used for drawing vertical lines

• Used for drawing horizontal lines

• Used for drawing circles

• Both B and C

Answer explanation

Set squares are primarily used for drawing straight vertical and horizontal lines. They are not designed for drawing circles, making options B and C incorrect.

By combining set squares, we can create:

• 90°, 60°, 45°, 30°

• 90°

• Multiples of 15°

• Any one

Answer explanation

By combining set squares, which typically include angles of 30°, 45°, and 60°, we can create various angles. The combinations allow for multiples of 15°, making 'Multiples of 15°' the correct choice.

Clinograph is a:

• Instrument used for measuring angle

• Adjustable set square

• Used for measuring distance

• None of these

Answer explanation

A clinograph is specifically designed as an adjustable set square, which allows for precise angle measurements. The other options do not accurately describe its function.

The outer lines of an object are drawn using:

• HB pencil

• H pencil

• 2H pencil

• 3H pencil

Answer explanation

The H pencil is ideal for drawing outer lines as it provides a balance between hardness and darkness, making it suitable for clear outlines. HB pencils are softer, while 2H and 3H are harder and lighter, not ideal for outer lines.

Pencil suitable for lettering and dimensioning:

• 3H

• HB

• 2H

• B

Answer explanation

The HB pencil is ideal for lettering and dimensioning as it provides a good balance of hardness and darkness, making it suitable for clear, precise lines without being too soft or too hard.

Drawing sheets follow international standard size based on paper A0 having area of:

• 0.25 m²

• 0.5 m²

• 1 m²

• √2 m²

Answer explanation

The A0 paper size is defined to have an area of 1 m². This standard is used internationally for drawing sheets, making 1 m² the correct answer.

The area ratio between two consecutive sheet sizes (e.g., A0 to A1) is:

• 1:2

• √2:1

• 2:1

• 1:√2

Answer explanation

The area of each A-size sheet is half of the previous size. Therefore, the area ratio between A0 and A1 is 2:1, meaning A0 is twice the area of A1.

Name of the drawing board of size 1000 mm × 700 mm:

• Elephant

• Double Elephant

• Half Imperial

• Imperial

Answer explanation

The drawing board size of 1000 mm × 700 mm is referred to as 'Double Elephant'. This term is used in art and design to denote large drawing surfaces, distinguishing it from other sizes like 'Imperial' or 'Half Imperial'.