Discussion

Match the processes with their characteristics.

Process	Characteristics
P: Electrical Discharge Machining	1. No residual stress
Q: Ultrasonic machining	2. Machining of electrically conductive materials
R: Chemical machining	3. Machining of glass
S: Ion Beam Machining	4. Nano-machining

Answer: A

The matching is P-2, Q-3, R-1, S-4.

EDM removes material by electric sparks, so the work must be electrically conductive (P-2).
Ultrasonic machining uses abrasive slurry hammered by a vibrating tool, ideal for hard, brittle non-conductors such as glass (Q-3).
Chemical machining dissolves material by etching with no mechanical or thermal load, leaving no residual stress (R-1).
Ion beam machining removes material atom by atom, so it is used for nano-scale machining (S-4).

The other options swap EDM and USM (which would make EDM cut glass) or put nano-machining against chemical machining.

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