Blueprint Reading and Technical Drawing Flashcards

On a blueprint dimension, what does a tolerance notation of '25.00 ± 0.05' indicate?

Answer: The feature may range from 24.95 to 25.05 units

The ± 0.05 tolerance means the actual dimension may be 0.05 units above or below the nominal 25.00, giving an acceptable range of 24.95 to 25.05.

In a standard weld symbol on a blueprint, the arrow side of the reference line indicates what?

Answer: The weld symbol applies to the joint side the arrow points to

The arrow on a weld symbol points to the specific joint, and weld information below the reference line applies to the arrow side of the joint.

What does the notation 'TYP' (or 'TYP.') mean when it appears next to a dimension on a blueprint?

Answer: The dimension applies to all identical features throughout the drawing

'TYP' (typical) means the dimension or feature shown applies equally to all similar or identical features on the drawing, avoiding repetitive dimensioning.

What type of line is used to indicate a cutting plane in a section view drawing?

Answer: A thick chain line with arrowheads showing the viewing direction

Cutting plane lines are drawn as thick chain lines (long dashes with short dashes) with arrowheads at each end indicating the direction of sight for the section view.

On a mechanical blueprint, what does the surface finish symbol (a check-mark-like symbol) indicate?

Answer: The required texture or roughness of a machined surface

Surface finish symbols specify the required surface texture, roughness, and lay of a machined surface, typically measured in micrometers (µm) or microinches (µin).

What is an isometric drawing used for in industrial trades?

Answer: Representing a 3D object in a 2D drawing using 30° axes for a pictorial view

Isometric drawings display three faces of an object simultaneously using 30° angles from horizontal, giving a three-dimensional pictorial representation without perspective distortion.

On a piping or mechanical blueprint, what does the abbreviation 'NPS' stand for?

Answer: Nominal Pipe Size

NPS (Nominal Pipe Size) is the North American standard designation for pipe sizes; the nominal diameter is a reference number that does not necessarily equal the actual pipe diameter.