Blueprint Reading Flashcards
7 cards from real ITMC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Blueprint Reading flashcards as text
On a mechanical drawing, what does a hidden line (dashed line) represent?
Answer: An edge or feature not visible from the current viewing angle
Hidden lines (dashed) show edges or features that exist behind visible surfaces in the current view.
What is the purpose of a revision block on an engineering drawing?
Answer: To record changes made to the drawing after its initial release
The revision block documents changes, dates, and descriptions of modifications made to a drawing after original issue.
A first-angle projection differs from third-angle projection primarily in that:
Answer: The view is placed on the opposite side from where the observer looks
In first-angle projection (common in Europe), the view is projected onto the plane beyond the object, opposite to the observer's side.
On a blueprint, the symbol GD&T uses for flatness is:
Answer: Two parallel horizontal lines
The GD&T flatness symbol is two parallel horizontal lines, indicating that a surface must lie within two parallel planes.
What does 'MAX' written next to a dimension on a blueprint indicate?
Answer: The feature must not exceed that value
'MAX' indicates an upper limit — the manufactured feature must be at or below that value.
In a piping and instrumentation diagram (P&ID), a dashed line connecting two instrument symbols typically indicates:
Answer: An electrical or signal connection
On P&IDs, dashed lines represent electrical or signal connections between instruments or controllers.
A scale of 1:2 on a drawing means:
Answer: The object is drawn at half its actual size
A 1:2 scale means one unit on the drawing equals two units in reality, so the drawing is half the actual size.