AIT Blueprint Reading 4

Question 1

What does the abbreviation 'TYP' mean when placed next to a dimension on a blueprint?

Accepted Answer

Typical — applies to all similar features

Answer

'TYP' means 'Typical' and indicates that the dimension or note applies to all identical or similar features on the drawing.

Question 2

In a piping isometric drawing, what does a small circle on a pipe line with an X through it typically represent?

Accepted Answer

A globe valve (closed)

Answer

A circle with an X symbol on piping isometrics commonly represents a globe valve, with the X indicating the handwheel or closure device.

Question 3

What is the purpose of a revision cloud on a blueprint?

Accepted Answer

To highlight areas that have been changed since the last issue

Answer

A revision cloud is a series of arcs drawn around an area of a drawing to highlight changes made after the original issue.

Question 4

On a structural steel blueprint, what does the designation W8x31 refer to?

Accepted Answer

A wide-flange beam 8 inches deep weighing 31 pounds per foot

Answer

W8x31 designates a wide-flange (W-shape) structural steel section that is approximately 8 inches deep and weighs 31 pounds per linear foot.

Question 5

What does the symbol '⌀' (diameter symbol) before a number on a blueprint indicate?

Accepted Answer

The dimension refers to a circular feature's diameter

Answer

The ⌀ symbol placed before a dimension value indicates that the measurement is the diameter of a circular feature such as a hole or shaft.

(AIT) Apprenticeship and Industry Training Practice Test