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Mr. Dubey • 100.64K Points
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Q. Typical frequencies which might be used to perform ultrasonic testing of ferrous and non-ferrous welds are:

  • (A) 25 to 100 kHz
  • (B) 200 to 5 MHz
  • (C) 1 MHz to 5 MHz
  • (D) 2.25 MHz to 10 MHz
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