CDT Blueprint Reading & Specifications 3

Question 1

In blueprint reading, what does a centerline symbol (CL or ℄) signify?

Accepted Answer

The axis of symmetry or center of a feature such as a hole or shaft

Answer

Centerlines mark the axis of symmetric features and are used to locate holes, shafts, and similar elements.

Question 2

Which specification writing method describes the desired result or performance level without specifying a particular product?

Accepted Answer

Performance specification

Answer

Performance specifications state what the finished product must achieve, leaving the means to the contractor.

Question 3

On a structural drawing, what does 'W12×53' describe?

Accepted Answer

A wide-flange steel beam, 12 inches nominal depth, weighing 53 pounds per linear foot

Answer

The 'W' designation denotes a wide-flange shape; the first number is nominal depth in inches and the second is weight per foot.

Question 4

What does the symbol 'Ø' preceding a dimension number indicate on a mechanical drawing?

Accepted Answer

The feature is a diameter

Answer

The Ø symbol indicates that the dimension refers to the diameter of a circular feature.

Question 5

In the CSI three-part specification format, Part 2 covers:

Accepted Answer

Products, materials, and their standards

Answer

Part 2 (Products) specifies the materials, components, and manufactured items to be used.

(CDT) Certified Drafting Technician Practice Test