Session 1.15 PowerPoint Engineering Drawings - line types

Question 1

Name the five main types of lines used in engineering drawings.

Answer 1

Visible, Hidden, Centre, Construction, Dimension.

Question 2

What is the purpose of a construction line?

Answer 2

It is a light, thin line used to set out layouts, which can be erased and does not appear in the final drawing.

Question 3

How are visible lines drawn and what do they show?

Answer 3

Thick, dark lines that represent the outline and visible edges of an object.

Question 4

What does a hidden line represent?

Answer 4

Features not visible from the current view, drawn as short dashes.

Question 5

How are centre lines drawn and what do they indicate?

Answer 5

Alternating short and long dashes, used to show centres of holes, circles, or symmetry.

Question 6

What is the function of a dimension line?

Answer 6

To indicate measured distances between extension lines, marked with arrows and units.

Question 7

What is tolerance in engineering drawings?

Answer 7

The acceptable range of variation in a measurement, written as ± value.

Question 8

If a part is specified as 10 mm with a tolerance of ±0.5 mm, what is the acceptable range?

Answer 8

9.5 mm to 10.5 mm.

Question 9

Which tool is commonly used to check tolerance in manufactured parts?

Answer 9

Vernier callipers.

Question 10

Why is applying tolerance important in engineering drawings?

Answer 10

It ensures parts fit and function correctly while allowing for small manufacturing errors.