LIQUID PENETRANT LEVEL 2

Which of the following physical properties, more than any other, determines what makes a material a good penetrant? |A. Viscosity |B. Surface tension |C. Wetting ability |D. No one single property determines if a material will or will not be a good penetrant. - Answer-D - No single property determines if a material will or will not be a good penetrant The speed with which a penetrant penetrates a surface flaw is influenced to the greatest extent by which of the following properties? |A. Density |B. Surface tension and wetting ability |C. Viscosity |D. Relative weight - Answer-C - Yes, viscosity is a measure of flow resistance; the lower the viscosity the faster the penetration. Which of the statements below concerning the operation of the black light bulbs of the mercury arc type is NOT true? |A. It takes about 5 minutes for the bulb to warm up to its full output when first turned on. |B. The lamp may go out if the line voltage drops below 90 volts. |C. Line voltage variations above 120 volts will have little or no effect on the bulb. |D. If for any reason the arc is extinguished, the bulb will not immediately respond if the lamp is turned on right after it has been turned off. - Answer-C. Line voltage variations above 120 volts will have little or no effect on the bulb. Which of the items listed below is NOT an advantage of the liquid penetrant test method? |A. The method can find all types of discontinuities. |B. The method is simple in principle and relatively easy to understand. |C. The method is essentially simple in application. |D. There are few limitations on the size and shape of the article that can be treated by this method. - Answer-A. The method can find all types of discontinuities. W