Liquid Penetrant Testing (LPT) Multiple Choice Question and Answers (MCQ)

 

1.       The natural force which makes Liquid Penetrant Test possible is known as

(a)    Charle’s Law

(b)   Gravitational Law

(c)    Surface tension

(d)   Capillary action

 

2.       The Penetrant and metal temperature ,at the time of Liquid Penetrant Testing should be 

                (a)    Less than 10 Degree C

(b)   At least 52 Degree C

(c)    In between 10 to 52 Degree C

(d)   None of the above

 

3.       Which one of the following is true limitation of the Liquid Penetrant Testing

(a)    It can’t detect the sub-surface discontinuities

(b)   It can’t be used on nonmagnetic materials

(c)    It can’t be used on the ferromagnetic materials

(d)   All of the above

 

4.        Fluorescent Penetrant produce indications that are visible only under

(a)    White light

(b)   Red light

(c)    UV light

(d)   Infrared light

 

5.       The main purpose of the UV light in florescent inspection is

(a)    To make Penetrant effective

(b)   Cleaning of surface

(c)    To make the indications visible

(d)   To magnify the indications

 

6.       The advantage of wet suspension inspection over dry particle inspection

(a)    Sensitive to very small discontinuities

(b)   Form a uniform layer over the surface of the part

(c)    Spreads quickly over the surface

(d)   All of the above

 

7.       Materials that are commonly inspected using Liquid Penetrant Testing

(a)    Plastics

(b)   Metals

(c)    Ceramics

(d)   All of the above

 

8.       The penetrants that are used to detect the smallest defects

(a)    Can detect only subsurface defect

(b)   Will also produce the largest amount of irrelevant indications

(c)    Should only be used on automobile parts

(d)   Can only be used on small parts less than 12 inches in surface area

 

9.       Type of flaws that can be inspected using LPI

(a)    Fatigue cracks

(b)   Quench cracks

(c)    Porosity

(d)   All of the above

 

10.   Acceptable methods of penetrant application is

(a)    Spraying

(b)   Dipping

(c)    Brushing

(d)   All of the above

 

11.   In LPI, wetting or no wetting of the solid surface by a liquid is depend on _____parameter

(a)    Surface Tension

(b)   Contact angle

(c)    Critical angle

(d)   Viscosity

 

12.   Liquid penetrant testing is based on the principle of

(a)    Charle’s Law

(b)   Gravitational Law

(c)    Surface tension

(d)   Capillary action

 

13.   A penetrant that is self-emulsifying is called

(a)    Solvent removable

(b)   Water washable

(c)    Post-emulsified

(d)   Dual sensitivity method

 

14.   What is likely result of incomplete removal of all excess penetrant from the test piece

(a)    Formation of relevant indications

(b)   Formation of false indications

(c)    Exaggeration of the size of relevant indications

(d)   Both a and b

 

15.   Which of the following pre-cleaning processes in LPI is not recommended

(a)    Wire brushing

(b)   Shot blasting

(c)    Detergent cleaning 

(d)   Emery paper cleaning