ITMC Blueprint Reading 4 — Questions and Answers
Question 1: A weld symbol with a filled circle at the junction of the reference line and arrow indicates:
- A field weld to be performed on-site (Correct answer)
- An all-around weld on the joint
- A plug or slot weld type
- A seam weld along the entire length
Correct answer: A field weld to be performed on-site
A filled (solid) dot at the tail-arrow junction of a weld symbol indicates a field weld, meaning it is to be made at the installation site rather than in the shop.
Question 2: On a blueprint, the symbol '⌀' preceding a dimension number indicates:
- A square cross-section feature
- A diameter measurement (Correct answer)
- A depth specification
- A radius measurement
Correct answer: A diameter measurement
The ⌀ (phi) symbol indicates that the dimension is a diameter, typically for a cylindrical or circular feature.
Question 3: What is the function of a 'detail view' on an engineering drawing?
- To show the complete assembly in a single view
- To show an enlarged view of a small or complex area for clarity (Correct answer)
- To display only hidden features of the part
- To provide a three-dimensional representation of the part
Correct answer: To show an enlarged view of a small or complex area for clarity
A detail view presents an enlarged version of a small or intricate area that cannot be clearly shown at the drawing's main scale.
Question 4: In a pneumatic circuit diagram, a rectangle with two triangles pointing inward from each side represents:
- A pressure regulator
- A double-acting cylinder (Correct answer)
- A flow control valve
- A 4-way directional control valve
Correct answer: A double-acting cylinder
A double-acting cylinder in pneumatic diagrams is shown as a rectangle with two opposing inward-pointing triangles, representing pressure ports on both ends.
Question 5: The 'straightness' GD&T control differs from 'flatness' in that straightness:
- Controls a surface, while flatness controls an axis
- Controls a line element or axis, while flatness controls a surface (Correct answer)
- Requires a datum reference, while flatness does not
- Only applies to external features of size
Correct answer: Controls a line element or axis, while flatness controls a surface
Straightness controls individual line elements (on a surface) or the central axis of a cylindrical feature, while flatness controls an entire surface.
Question 6: On a structural steel drawing, the notation 'W12×40' refers to:
- A wide-flange beam 12 inches deep weighing 40 pounds per linear foot (Correct answer)
- A weld symbol 12 inches long with 40% penetration
- A W-grade steel with 12% carbon and 40 ksi yield strength
- A beam 12 feet long with 40-inch flange width
Correct answer: A wide-flange beam 12 inches deep weighing 40 pounds per linear foot
W-shape notation means wide-flange section with nominal depth (12 inches) and weight per foot (40 lb/ft).
Question 7: When a drawing note states 'REMOVE ALL BURRS AND SHARP EDGES,' this instruction applies to:
- Only the features specifically dimensioned on the drawing
- All edges of the finished part unless otherwise specified (Correct answer)
- Only edges visible in the main view
- Only cut surfaces created during machining
Correct answer: All edges of the finished part unless otherwise specified
General notes like 'remove all burrs and sharp edges' apply globally to the entire part unless specific exceptions are called out.
ITMC Blueprint Reading 4
A weld symbol with a filled circle at the junction of the reference line and arrow indicates: