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NDT Test 1-Questions with Correct Answers/ Verified/ Latest 2024/2025
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NDT Test 1-Questions with Correct Answers/ Verified/ Latest 2024/2025
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NDT Test 1-Questions with Correct Answers/ Verified/ Latest2024/2025
What are two advantages of non-destructive testing - ✔✔The material tested are not
damaged or Destroyed and Most of the equipment available is very portable
What is liquid Penetrant testing? - ✔✔is an NDT method used for location surface
discontinuities in a non-porous object
What principle enables PT to work? - ✔✔Capillary force or action, this force causes the
liquid to creep and crawl into fine openings
All penetrants are? - ✔✔Oil-Based, oils are used due to their low surface tensions
The Forerunner of modern penetrant techniques was known as? - ✔✔Oil whiting method
What is the definition of surface tension? - ✔✔Us the property of the atoms that bind the
surface of a liquid, resembling an elastic skin under tention
A discontinuity can be defined as - ✔✔Change, Break or Interruption
Type 1 - ✔✔Fluorescent Dye
Type 2 - ✔✔Visible dye
Type 3 - ✔✔Dual Mode dye (Fluoresent/visible)
Phosphorescence - ✔✔glows till light source is removed then dissipates
Black light have 2 important fuctrions what are they - ✔✔Removing the short wave
ultraviolet lights and removing most of the white light that the lamp produces
, what is eyeball florescence? - ✔✔It is the fluorescing of the liquid of the eye and results in
momentary blurred vision and, of course, a short period of time when it would be
impossible to continue with the inspection
what should be the minimum intensity of black light? - ✔✔1000 Micro-watt per cm squared
what are some safety features built in the black light? - ✔✔If the voltage fluctuates from 90-
120 volts , the bulb will shut itself off
if the bulb gets too hot, it will shut itself off
vibration will also shut the bulb off (wait 5 mins to cool down)
Safe handling of a black light? - ✔✔Once the bulbs have warmed up, they get very hot
if the black light filter shatters, turn the bulb off immediately (unfiltered UV)
if the quartz tuve shatters, you may have mercury contmiation, Disposal of bulbs must be
treated as toxic waste
what is the contrast ratio of type 1 - ✔✔300 to 1 or 1000 to 1 and must be viewed inder a
black light and in a dark area
What is the contrast ratio of type 2 - ✔✔Low 6 to 1 or 9 to 1.
in the electromagnetic spectrum where is black light found - ✔✔320 nm Peaks @ 365nm
how much white light is need for a visble dye penetant inspection - ✔✔20WX
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