CPI Blueprint & Schematic Interpretation 3

Question 1

What does the abbreviation 'CL' or the symbol '¢' represent on a blueprint?

Accepted Answer

Centerline

Answer

CL or the centerline symbol (¢) marks the exact center of a feature, component, or opening on a drawing.

Question 2

In a wiring diagram, conductors that cross without a dot at the intersection are:

Accepted Answer

Not electrically connected

Answer

A crossing without a junction dot means the wires pass over each other but are not electrically connected.

Question 3

Which line type on a blueprint indicates a hidden edge or surface not visible from the current view?

Accepted Answer

Dashed thin line

Answer

Hidden lines are drawn as short evenly-spaced dashes to show edges or surfaces concealed behind the visible surface.

Question 4

A blueprint title block typically does NOT include:

Accepted Answer

Material cost estimates

Answer

Title blocks contain project identification, scale, revision history, and drafter information—not cost estimates, which belong in bid documents.

Question 5

On a pneumatic control schematic, a triangle pointing downward with its apex at a line represents:

Accepted Answer

An exhaust or vent to atmosphere

Answer

A downward-pointing triangle symbol on a pneumatic schematic denotes an exhaust port venting to atmosphere.

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