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A form of thermal cracking, __________, can occur when high and nonuniform thermal stresses develop over a relatively short period of time in a piece of equipment due to differential expansion and contraction.
A form of thermal cracking, __________, can occur when high and nonuniform thermal stresses develop over a relatively short period of time in a piece of equipment due to differential expansion and contraction.A . Thermal expansionB . Thermal stressC . Thermal shockD . Linear expansionView AnswerAnswer: C
Time to failure by thermal fatigue is primarily affected by:
Time to failure by thermal fatigue is primarily affected by:A . Magnitude of stress and operating temperature.B . Magnitude of stress and number of cycles.C . Carbon content in material and operating temperature.D . Carbon content in material and number of cycles.View AnswerAnswer: B
Nitriding layers are magnetic. Therefore, _________ should be checked for magnetism as an initial screening for nitriding.
Nitriding layers are magnetic. Therefore, _________ should be checked for magnetism as an initial screening for nitriding.A . 300 Series SSB . 400 Series SSC . Duplex SSD . Low alloy steelView AnswerAnswer: A
Non-stressed relieved __________ is susceptible to stress corrosion cracking when in contact with moist HF vapors in the presence of oxygen.
Non-stressed relieved __________ is susceptible to stress corrosion cracking when in contact with moist HF vapors in the presence of oxygen.A . Carbon steelB . Alloy 400C . 300 Series SSD . 400 Series SSView AnswerAnswer: B
____________ are characterized by a localized loss in thickness in the form of pits, grooves, gullies, waves, rounded holes and valleys. These losses often exhibit a directional pattern.
____________ are characterized by a localized loss in thickness in the form of pits, grooves, gullies, waves, rounded holes and valleys. These losses often exhibit a directional pattern.A . ErosionB . Corrosion/ErosionC . Environmental corrosionD . Both A and BView AnswerAnswer: D
The endurance limit is usually about:
The endurance limit is usually about:A . 10-20% of a material’s ultimate tensile strength.B . 40-50% of a material’s ultimate tensile strengthC . 10-20% of a material’s yield strength.D . 40-50% of a material’s yield strength.E . Half way up the ladder of a 150’ column (tower).View AnswerAnswer: B
With Cl SCC, ________ levels of chloride ________ the likelihood of cracking.
With Cl SCC, ________ levels of chloride ________ the likelihood of cracking.A . Decreasing, IncreasesB . Increasing, DecreasesC . Increasing, IncreasesD . Increasing, EliminatesView AnswerAnswer: C
Carburization can be confirmed by a substantial increase in hardness and a _______ in ductility.
Carburization can be confirmed by a substantial increase in hardness and a _______ in ductility.A . LossB . GainC . ChangeD . None of the aboveView AnswerAnswer: A
All ________ based materials and low alloy materials, 300 Series SS and 400 Series SS are susceptible to Sulfidation.
All ________ based materials and low alloy materials, 300 Series SS and 400 Series SS are susceptible to Sulfidation.A . CarbonB . SteelC . ChromiumD . IronView AnswerAnswer: D
The “L” grade of stainless steels will sensitize if exposed more than several hours above _______ or long term above _____.
The “L” grade of stainless steels will sensitize if exposed more than several hours above _______ or long term above _____.A . 1200º F, 800º FB . 1000º, 600º FC . 1000º F, 750º FD . 1100º F, 800º FView AnswerAnswer: C
