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Corrosion in boiler feedwater and condensate return systems is usually the result of dissolved gases, oxygen and _______.
Corrosion in boiler feedwater and condensate return systems is usually the result of dissolved gases, oxygen and _______.A . Carbon monoxideB . H²OC . TemperatureD . Carbon DioxideView AnswerAnswer: D
Carbon steel and low alloy steels are subject to excessive hydrochloric acid corrosion when exposed to any concentration of HCl acid that produces a pH below______.
Carbon steel and low alloy steels are subject to excessive hydrochloric acid corrosion when exposed to any concentration of HCl acid that produces a pH below______.A . 6.0B . 5.5C . 5.0D . 4.5View AnswerAnswer: D
Hardness levels above ________ are highly susceptible to hydrogen stress cracking (HF).Time-to-failure decreases as the hardness increases.
Hardness levels above ________ are highly susceptible to hydrogen stress cracking (HF).Time-to-failure decreases as the hardness increases.A . 225 BHNB . 237 BHNC . 241 BHND . 247 BHNView AnswerAnswer: B
The effects of hydrogen embrittlement ___________ with _________ temperatures.
The effects of hydrogen embrittlement ___________ with _________ temperatures.A . Increase, increasingB . Decrease, decreasingC . Increase, decreasingD . Decrease, increasingView AnswerAnswer: D
_________ is a form of carburization resulting in accelerated localized pitting which occurs in carburizing gases and/or process streams containing carbon and hydrogen. Pits usually form on the surface and may contain soot or graphite dust.
_________ is a form of carburization resulting in accelerated localized pitting which occurs in carburizing gases and/or process streams containing carbon and hydrogen. Pits usually form on the surface and may contain soot or graphite dust.A . Hydrate corrosionB . Carbide corrosionC . SpheroidizationD . Metal dustingView AnswerAnswer: D
Geometry, stress level, _________ and material properties are the predominate factors in determining the fatigue resistance of a component.
Geometry, stress level, _________ and material properties are the predominate factors in determining the fatigue resistance of a component.A . TemperatureB . PressureC . VelocityD . Number of cyclesView AnswerAnswer: D
Which of the following materials is least affected by atmospheric corrosion?
Which of the following materials is least affected by atmospheric corrosion?A . Carbon steelB . ChromesC . Stainless steelsD . Copper alloyed with aluminumView AnswerAnswer: C
What structure is 410 stainless steel?
What structure is 410 stainless steel?A . MartensiticB . AusteniticC . DuplexD . FerriticView AnswerAnswer: A
For some materials such as titanium, carbon steel and low alloy steel, the number of cycles to fatigue fracture decreases with ________ until an endurance limit is reached. Below this endurance limit, fatigue cracking will not occur, regardless of the number of cycles.
For some materials such as titanium, carbon steel and low alloy steel, the number of cycles to fatigue fracture decreases with ________ until an endurance limit is reached. Below this endurance limit, fatigue cracking will not occur, regardless of the number of cycles.A . Temperature increasesB . Stress enduranceC ....
Metallic components form a surface __________ when exposed to sulfur compounds. This may react with air (oxygen) and moisture to form sulfur acids (polythionic acid).
Metallic components form a surface __________ when exposed to sulfur compounds. This may react with air (oxygen) and moisture to form sulfur acids (polythionic acid).A . OxideB . Sulfide scaleC . Sulfate scaleD . Caustic scaleView AnswerAnswer: B
