A zigzag cavity in a block of high strength alloy is to

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A zigzag cavity in a block of high strength alloy is to be finish machined. This can be carried out by using

1. electric discharge machining
2. electro-chemical machining
3. laser beam machining
4. abrasive flow machining

Correct Option: A

For making complex shape for higher strength alloy, electro-chemical machining is used because in it no mechanical force is exerted as well as tool left its impression over machined surfaced.