The fluorescent dyes used in the liquid penetrant testing process are – McqOptions

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1.	The fluorescent dyes used in the liquid penetrant testing process are most active when energised with black light of what wavelengths? ( stands for angstrom units)
A.	2.0 10-7m (2000 )
B.	2.5 10-7m (2500 )
C.	3.25 10-7m (3250 )
D.	3.65 10-7m (3650 )
Answer» E.

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