Welding MCQ Set 6

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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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Answer: D) All of the above
Explanation: Porosity is caused by gases trapped due to flux decomposition, moisture, or contamination.