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Frequency of tool’s oscillation in USM ranges between ________

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Frequency of tool’s oscillation in USM ranges between ________

(a) 5-10 kHz

(b) 10-15 kHz

(c) 18-20 kHz

(d) 25-50 kHz

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I'm obligated to ask this question of Ultrasonic Machining in section Mechanical Processes of Advanced Machining

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Correct option is (c) 18-20 kHz

To explain I would say: Frequency used in USM is between 18 – 20 kHz.

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