The following four unconventional machining processes are

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The following four unconventional machining processes are available in a shop floor. The most appropriate one to drill a hole of square cross section of 6 mm × 6 mm and 25 mm deep is

1. Abrasive Jet Machining
2. Plasma Arc Machining
3. Laser Beam Machining
4. Electro Discharge Machining

Correct Option: D

EDM is most suitable process of square holes, intricate triangular holes etc.