The GATE Grind

GATE 2018 ME (ME2) – Question 26

Machining and Machine Tool Operations · Abrasive and non-traditional machining processes · 1 mark · Multiple choice

Material removal in electric discharge machining occurs through ______.

  1. ion displacement
  2. melting and vaporization
  3. corrosive reaction
  4. plastic shear

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Show answer and explanation

Correct answer: (B) melting and vaporization

Explanation

Electrical sparks generate intense localized heat across the dielectric gap, melting and vaporizing small workpiece volumes that are flushed away. Hence **melting and vaporization, B**. Electrochemical dissolution is characteristic of ECM, not EDM.