ETC Materials Testing & Quality Assurance 2

Question 1

What does a Charpy impact test measure in a material?

Accepted Answer

Energy absorbed during fracture

Answer

The Charpy impact test measures the energy a notched specimen absorbs when struck by a swinging pendulum, indicating toughness.

Question 2

In a Brinell hardness test, a 10 mm steel ball is pressed into a specimen. What is measured to calculate hardness?

Accepted Answer

Diameter of the residual indentation

Answer

Brinell hardness is calculated by dividing the applied load by the curved surface area of the indentation, using the measured indentation diameter.

Question 3

Which destructive test method is used to determine a metal's yield strength, ultimate tensile strength, and elongation in one test?

Accepted Answer

Tensile test

Answer

A tensile test (tension test) generates a stress-strain curve that reveals yield strength, ultimate tensile strength, and percent elongation simultaneously.

Question 4

A material exhibits a 0.2% offset yield strength. What does the 0.2% refer to?

Accepted Answer

The plastic strain offset used to define yield

Answer

The 0.2% offset method draws a line parallel to the elastic portion of the stress-strain curve starting at 0.2% strain to find yield strength for materials with no distinct yield point.

Question 5

What is the primary purpose of a hydrostatic pressure test on a pressure vessel?

Accepted Answer

To verify structural integrity and check for leaks under pressure

Answer

A hydrostatic test fills the vessel with water and pressurizes it above operating pressure to confirm it can hold pressure without leaking or failing.

(ETC) Engineering Technician Certification Practice Test

(ETC) Engineering Technician Certification Practice Test

ETC Materials Testing & Quality Assurance 2