Question No:-11

________ has been a major problem on coke drum shells.   1. Thermal fatigue   2. Stress cracking   3. Erosion   4. Temper embrittlement  View Answer Answer:-1. Thermal fatigue

Question No:-12

Thermal fatigue cracks propagate ________ to the stress and are usually dagger shaped, transgranular and oxide-filled.   1. Axial   2. Diagonal   3. Transverse   4. Angular  View Answer Answer:-3. Transverse

Question No:-13

Inspection for wet H2S damage generally focuses on _____ and ______.   1. Weld seams   2. Nozzles   3. Trays   4. Down comers   5. A and B  View Answer Answer:-5. A and B

Question No:-14

________ is a form of erosion caused by the formation and instantaneous collapse of innumerable tiny vapor bubbles.   1. Condensate corrosion   2. Cavitation   3. Dew-Point corrosion   4. Atmospheric corrosion  View Answer Answer:-2. Cavitation

Question No:-15

With CUI, corrosion rates __________ with increasing metal temperatures up to the point where the water evaporates quickly.   1. Decrease   2. Increase   3. Stay the same   4. None of the above  View Answer Answer:-2. Increase