WELDING MCQ SET 6
Q1. Ultrasonic testing in welding is used to detect:
A) Surface cracks
B) Subsurface defects
C) Porosity only
D) Arc blow
Answer: B) Subsurface defects
Explanation: Ultrasonic waves penetrate the weld to detect internal flaws like cracks or inclusions.
Q2. Radiographic testing uses:
A) Sound waves
B) X-rays or gamma rays
C) Visual inspection
D) Chemical reagents
Answer: B) X-rays or gamma rays
Explanation: Radiography detects internal flaws in welds by recording shadows on film.
Q3. Dye penetrant testing is suitable for:
A) Subsurface defects
B) Surface defects
C) Porosity
D) Chemical bonding
Answer: B) Surface defects
Explanation: Liquid dye penetrates surface cracks and reveals them under ultraviolet light.
Q4. Magnetic particle inspection (MPI) is used for:
A) Non-magnetic metals
B) Ferromagnetic materials
C) Aluminum
D) Stainless steel
Answer: B) Ferromagnetic materials
Explanation: MPI detects surface and near-surface defects using magnetic flux leakage.
Q5. Weld reinforcement refers to:
A) The root gap
B) Metal above the parent metal surface
C) Undercut depth
D) Heat-affected zone
Answer: B) Metal above the parent metal surface
Explanation: Proper reinforcement ensures strong, defect-free welds.
Q6. The weld joint symbol is standardized by:
A) ANSI
B) ISO
C) AWS
D) BSI
Answer: C) AWS
Explanation: American Welding Society standardizes welding symbols and specifications.
Q7. Fillet weld is typically used for:
A) Butt joints
B) Lap, tee, or corner joints
C) Groove welding
D) Soldering
Answer: B) Lap, tee, or corner joints
Explanation: Fillet welds join surfaces at right angles without groove preparation.
Q8. The effective throat thickness of a fillet weld is:
A) The leg length
B) Shortest distance from root to hypotenuse
C) Groove depth
D) Weld length
Answer: B) Shortest distance from root to hypotenuse
Explanation: This dimension ensures adequate strength in fillet welds.
Q9. Which type of weld is used for high-strength applications?
A) Fillet weld
B) Butt weld
C) Spot weld
D) Seam weld
Answer: B) Butt weld
Explanation: Butt welds provide full penetration and superior joint strength.
Q10. Weld porosity occurs due to:
A) Excessive heat
B) Entrapped gases
C) Improper flux
D) All of the above
Answer: D) All of the above
Explanation: Porosity is caused by gases trapped due to flux decomposition, moisture, or contamination.
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