NDT Material Properties & Inspection Standards 2

Question 1

What does the term 'anisotropy' mean in the context of boilermaker materials?

Accepted Answer

Properties that vary depending on direction of measurement

Answer

Uniform properties in all directions

Answer

Resistance to high-temperature oxidation

Answer

Tendency to crack under cyclic loading

Question 2

Which ASME standard governs the inspection and testing of pressure vessels?

Accepted Answer

ASME Section VIII

Answer

ASME B31.3

Answer

ASME Section IX

Answer

ASME B16.5

Question 3

The hardness of a material is best defined as its resistance to:

Accepted Answer

Permanent surface indentation or scratching

Answer

Fracture under impact loading

Answer

Elastic deformation under tensile stress

Answer

Fatigue under cyclic stress

Question 4

In NDT of boiler materials, what condition does 'hydrogen embrittlement' describe?

Accepted Answer

Loss of ductility due to hydrogen absorption into the metal lattice

Answer

Formation of hydrogen gas bubbles during welding

Answer

Corrosion of steel caused by hydrogen sulfide gas

Answer

Reduction in tensile strength due to elevated temperatures

Question 5

What is the purpose of a Charpy impact test on boiler plate material?

Accepted Answer

Evaluate notch toughness and ductile-to-brittle transition temperature

Answer

Determine the tensile strength at elevated temperatures

Answer

Measure resistance to fatigue cracking

Answer

Assess the material's resistance to surface corrosion

Question 6

Under ASME Section V, which article specifically covers radiographic examination?

Accepted Answer

Article 2

Answer

Article 1

Answer

Article 5

Answer

Article 7

Question 7

Which type of steel is most commonly used in high-pressure boiler drum construction due to its combination of strength and weldability?

Accepted Answer

Low-alloy chromium-molybdenum steel

Answer

Austenitic stainless steel (304)

Answer

Cast iron

Answer

High-carbon tool steel