1. What is tensile strength?

• The point at which a material begins to deform permanently.
• How much pulling force it takes to break a material.
• A material’s stiffness.
• The stress a material can withstand over long periods at high temperatures.

2. For most metals operating below the creep range, what is the maximum allowable stress in relation to the specified minimum tensile strength at room temperature?

• 50%
• 66.67%
• 33.33%
• 90%

3. What does yield strength indicate?

• The point at which a material fractures.
• How much a material can be compressed.
• Where the material starts to deform permanently.
• A material’s resistance to twisting.

4. For most metals, what is the maximum allowable stress in relation to the specified minimum yield strength at room temperature?

• One-third
• Two-thirds
• 90%
• 100%

5. For austenitic stainless steels and nickel alloys, the allowable stress can sometimes be based on what percentage of their yield strength at the operating temperature?

• 50%
• 66.67%
• 75%
• 90%

6. For flanged joints and other sensitive applications, what is the typical allowable stress limit for austenitic stainless steels and nickel alloys?

• The lower of 75% of the listed allowable stress value or 2/3 of the yield strength at temperature.
• 90% of the yield strength at the operating temperature.
• The tensile strength divided by three.
• 100% of the yield strength at room temperature.

7. In the creep range, what is the maximum allowable stress in relation to the average stress that would cause rupture after 100,000 hours?

• 100%
• 90%
• 80%
• 67%

8. In the creep range, the allowable stress cannot be more than what percentage of the minimum stress expected to cause rupture after 100,000 hours?

• 100%
• 90%
• 80%
• 67%

9. What is creep?

• A sudden fracture of a material under high stress.
• Slow deformation over time under stress, especially at higher temperatures.
• The elastic deformation of a material.
• The rapid expansion of a material due to heat.

10. What is HDS?

• Highly Ductile Steel
• Hydrostatic Design Stress
• Hydro Dynamic stress.
• Highest design standard.