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NDT TEST 1 QUESTIONS WITH ANSWERS
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NDT TEST 1 QUESTIONS WITHANSWERS
What are the two advantages of non-destructive testing? The materials
evaluated are not harmed or destroyed, and the majority of the equipment
available is highly portable.
What is liquid penetrating testing? - ANSWER is an NDT method for locating
surface discontinuities in a non-porous object.
What concept allows PT to work? - ANSWER Capillary force or action is the
force that causes liquid to creep and crawl into fine holes.
Are all penetrants? - ANSWER Oil-based, oils are employed because of their
low surface tension.
What was the forerunner of modern penetrant techniques called? - ANSWER
Oil Whiting Method
What is the definition of surface tension? - ANSWER Use the property of the
atoms that link the surface of a liquid, which resembles an elastic skin under
tension.
A discontinuity can be defined as: Change, Break, or Interruption.
Type 1: ANSWER Fluore
scent dye
Type 2 - Answer: Visible dye
Type 3: ANSWER Dual Mode Dye (Fluorescent/visible)
, Phosphorescence - ANSWER shines until the light source is withdrawn, then
disappears.
Blacklight has two significant functions. Removing the short-wave UV photons
and the majority of the white light that the bulb produces.
What is eyeball fluorescence? - ANSWER It is the fluorescing of the liquid of
the eye, which causes transient blurred vision and, of course, a short period
when it would be impossible to continue with the inspection.
What should be the minimum intensity of black light? - ANSWER 1000
microwatt per cm squared
What safety features are integrated into the black light? - ANSWER If the
voltage varies between 90 and 120 volts, the bulb will switch itself off.
If the bulb becomes too hot, it will turn itself off.
Vibration will also turn off the bulb (wait 5 minutes to cool down).
Safe use of a black light? - ANSWER Once the bulbs have warmed up, they
become extremely hot.
If the black light filter shatters, immediately switch off the bulb (unfiltered UV).
If the quartz tube shatters, you could have mercury contamination. The disposal
of bulbs must be regarded as harmful waste.
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