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RRB Junior Engineer / DMS / CMA 2019 · Question 3494 of 3719

Soft solder consists of-

  1. ACopper and tin
  2. BLead and zinc
  3. CLead and tinCorrect
  4. DLead and aluminium

Answer: C. Lead and tin

Explanation

Explanation: Soldering is the process by which metallic materials are joined with the help of another liquified metal (solder) Soldering can be classed as soft soldering and hard soldering. The process of joining metals using tin-lead solders which melt below 420°C is known as soft soldering The process of joining metals using hard solders consisting of copper, zinc, cadmium and silver which melt above 600° is known as hard soldering The eutectic alloy of tin-lead solder is a mixture of 63% tin and 37% lead . 63/37 solder melts at 183°C

Source: RRB JE 2019 (CBT 2) (ME) Previous Year Paper (31 Aug 2019) — prepp.in solved-paper PDF (answer key with explanations) · reliable-secondary

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