AIT Blueprint Reading 4 — Questions and Answers
Question 1: What does the abbreviation 'TYP' mean when placed next to a dimension on a blueprint?
- Top of Yield Point
- Typical — applies to all similar features (Correct answer)
- Type of material specification
- Thread Yield Position
Correct answer: Typical — applies to all similar features
'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?
- A union fitting
- A globe valve (closed) (Correct answer)
- A butt weld
- A pipe cap
Correct answer: A globe valve (closed)
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?
- To indicate a non-structural decorative element
- To highlight areas that have been changed since the last issue (Correct answer)
- To mark where insulation is required
- To show areas that will be demolished
Correct answer: To highlight areas that have been changed since the last issue
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?
- A 8-inch wide pipe, schedule 31
- A wide-flange beam 8 inches deep weighing 31 pounds per foot (Correct answer)
- A welded plate 8 feet by 31 feet
- A wire rod 8 mm diameter, grade 31
Correct answer: A wide-flange beam 8 inches deep weighing 31 pounds per foot
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?
- The measurement is a radius
- The dimension refers to a circular feature's diameter (Correct answer)
- The hole is countersunk
- The part requires a specific surface finish
Correct answer: The dimension refers to a circular feature's diameter
The ⌀ symbol placed before a dimension value indicates that the measurement is the diameter of a circular feature such as a hole or shaft.
Question 6: What is the function of a match line on a large blueprint set?
- It indicates where two materials join
- It shows where one drawing sheet continues on another sheet (Correct answer)
- It marks the exact center of a building
- It defines the property boundary line
Correct answer: It shows where one drawing sheet continues on another sheet
A match line shows where a large drawing has been split across multiple sheets and where the adjoining sheet continues the plan.
Question 7: On a blueprint, what does the abbreviation 'NTS' mean?
- Not To Scale (Correct answer)
- National Trade Standard
- Non-Threaded Section
- Neutral Temperature Setting
Correct answer: Not To Scale
'NTS' means Not To Scale, indicating that the drawn feature or dimension should not be measured directly from the drawing.
AIT Blueprint Reading 4
What does the abbreviation 'TYP' mean when placed next to a dimension on a blueprint?