Question No:-21

Cracks that are typically straight, non-branching, and devoid of any associated plastic deformation are likely associated with which type of failure?   1. Stress corrosion cracking   2. Brittle fracture   3. Thermal fatigue   4. Temper embrittlement  View Answer Answer:-2. Brittle fracture

Question No:-22

At high temperatures, metal components can slowly and continuously deform under load below the yield strength. This time dependent deformation of stressed components is known as _______?   1. Creep   2. Ductility   3. Softening   4. Hardening  View Answer Answer:-1. Creep

Question No:-23

Permanent deformation occurring at relatively low stress levels as a result of localized overheating is called ________.   1. Stress cracking   2. Brittle fracture   3. Temper embrittlement   4. Stress rupture  View Answer Answer:-4. Stress rupture

Question No:-24

_____________ usually occurs when a colder liquid contacts a warmer metal surface.   1. Brittle fracture   2. Thermal fatigue   3. Thermal shock   4. Stress rupture  View Answer Answer:-3. Thermal shock

Question No:-25

Nickel based alloys usually contain ________ nickel.   1. ≥30%   2. ≥20%   3. ≥10%   4. ≥12%  View Answer Answer:-1. ≥30%