Preview Questions PCB Assembly Technician | Role Specific Skill

Question 1: What defect occurs when solder does not wet the component lead properly?

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Cold solder joint

Non-wetting

Solder bridging

Tombstoning

Question 2: What is the tolerance limit for lead protrusion after soldering, as per IPC standards?

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1.5 mm

2.5 mm

3 mm

0.5 mm

Question 3: What is the typical etching chemical used in PCB manufacturing for copper removal?

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Ferric chloride

Ammonium chloride

Hydrochloric acid

Sodium hydroxide

Question 4: What is the typical melting point of lead-based solder (Sn60Pb40)?

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210?C

183?C

250?C

190?C

Question 5: Which cleaning method is recommended for PCBs with water-soluble flux?

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Hot water cleaning

Air blow cleaning

Ultrasonic cleaning

Isopropyl alcohol cleaning

Question 6: How can you prevent solder paste contamination during assembly operations?

Which action should you take?

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Use high-quality flux

Avoid touching paste with bare hands

Ensure proper storage temperature

All of the above