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Which current is helpful in detecting surface breaking indication?

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in Casting-Forming-Welding II by (119k points)
Which current is helpful in detecting surface breaking indication?

(a) High frequency AC

(b) Low frequency AC

(c) Full wave DC

(d) Half wave DC

I had been asked this question in class test.

This key question is from Magnaflux Test topic in portion Non Destructive Techniques of Casting-Forming-Welding II

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Best answer
The correct option is (d) Half wave DC

Explanation: None.

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