OIT Blueprint Reading and Technical Drawing 2

Question 1

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

Accepted Answer

The feature may range from 24.95 to 25.05 units

Answer

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.

Question 2

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

Accepted Answer

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

Answer

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.

Question 3

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

Accepted Answer

The dimension applies to all identical features throughout the drawing

Answer

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

Question 4

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

Accepted Answer

A thick chain line with arrowheads showing the viewing direction

Answer

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.

Question 5

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

Accepted Answer

The required texture or roughness of a machined surface

Answer

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

(OIT) Ontario Industrial Trades Certification Practice Test

(OIT) Ontario Industrial Trades Certification Practice Test

OIT Blueprint Reading and Technical Drawing 2