Non-Destructive Testing (NDT) Practice Test

How should fluorescent penetrant application be monitored?

1. Using a color intensity reader.

2. Using an integrity checked black light.

3. Using a reflective surface tester.

4. Using an ultrasonic thickness gauge.

The correct answer is: Using an integrity checked black light.

Monitoring fluorescent penetrant application is critical to ensure the effectiveness of the inspection process. The use of an integrity-checked black light is the most suitable method for this purpose. Fluorescent penetrant testing relies on the visibility of the fluorescent dye under UV light, and the integrity of the black light used is essential to ensure that the emitted wavelength effectively excites the dye. An integrity-checked black light ensures that the equipment is functioning correctly, providing sufficient intensity and the appropriate wavelength for optimal visibility of the penetrant indications. If the black light is not functioning properly, it could lead to missed defects or an inaccurate assessment of the part being inspected. The other options provided do not adequately monitor the specific aspects of the fluorescent penetrant application process. A color intensity reader is more suited for evaluating the color of a material rather than monitoring the inspection process itself. A reflective surface tester is used for assessing surface finish rather than the effectiveness of penetrants. An ultrasonic thickness gauge measures material thickness and does not relate to the monitoring of penetrant applications. Thus, using an integrity-checked black light is vital in ensuring reliable and effective fluorescent penetrant testing.