AIT Material Science 4

Question 1

When selecting pipe material for a system carrying mildly corrosive chemicals, which material property is MOST important?

Accepted Answer

Corrosion resistance

Answer

Corrosion resistance is the most critical property when selecting materials for systems handling corrosive substances.

Question 2

What is 'temper embrittlement' in alloy steels?

Accepted Answer

A loss of toughness after tempering in a specific temperature range

Answer

Temper embrittlement is the reduction in toughness of alloy steels tempered or slowly cooled through the 375–575°C range, caused by impurity segregation.

Question 3

Which non-destructive testing method uses high-frequency sound waves to detect internal flaws in materials?

Accepted Answer

Ultrasonic testing

Answer

Ultrasonic testing (UT) uses high-frequency sound waves to detect internal discontinuities and measure material thickness.

Question 4

What is the eutectic composition in a binary alloy system?

Accepted Answer

The composition that melts and solidifies at a single temperature lower than either pure component

Answer

The eutectic composition is the specific alloy ratio that solidifies at the lowest possible temperature as a mixture of two phases simultaneously.

Question 5

Which type of polymer becomes soft and moldable when heated and hardens when cooled, repeatedly?

Accepted Answer

Thermoplastic

Answer

Thermoplastics soften when heated and harden when cooled in a reversible process, allowing them to be remolded multiple times.

(AIT) Apprenticeship and Industry Training Practice Test

(AIT) Apprenticeship and Industry Training Practice Test

AIT Material Science 4