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Mechanical fatigue is caused by:
Mechanical fatigue is caused by:A . Cyclic stresses occurring over a long period of time.B . Higher than average stresses at high temperatures.C . Constant stresses occurring at low temperatures.D . Cyclic operating conditions of bird poop then rain, bird poop then rain, etc.View AnswerAnswer: A
With sulfuric acid corrosion, alloys such as Alloy 20 resist dilute acid corrosion and form a protective ________ film on the surface.
With sulfuric acid corrosion, alloys such as Alloy 20 resist dilute acid corrosion and form a protective ________ film on the surface.A . SulfideB . ChlorideC . Iron sulfateD . Iron oxideView AnswerAnswer: C
In general, the resistance of carbon steel and other alloys to High temperature corrosion is determined by the ________ content of the material.
In general, the resistance of carbon steel and other alloys to High temperature corrosion is determined by the ________ content of the material.A . MolybdenumB . ChromiumC . CarbonD . All of the aboveView AnswerAnswer: B
Cracks associated with brittle fracture will typically be _________.
Cracks associated with brittle fracture will typically be _________.A . JaggedB . BranchingC . StraightD . PerpendicularView AnswerAnswer: C
The creep threshold temperature for carbon steel is ________.
The creep threshold temperature for carbon steel is ________.A . 315º CB . 371º CC . 426º CD . 538º CView AnswerAnswer: B
The graphitization rate ____________ with increasing temperature
The graphitization rate ____________ with increasing temperatureA . IncreasesB . DecreasesC . StopsD . ProceedsView AnswerAnswer: A
Key factors affecting thermal fatigue are the magnitude of the temperature and the __________.
Key factors affecting thermal fatigue are the magnitude of the temperature and the __________.A . Number of cyclesB . PressureC . StressD . Alloy compositionView AnswerAnswer: A
A prime location for erosion is:
A prime location for erosion is:A . In catalyst piping.B . Downstream of a gate valve.C . Any superheated steam piping.D . Upstream of a pump.View AnswerAnswer: A
Corrosion of the anode may be significantly higher ________ to the connection to the cathode, depending on solution conductivity.
Corrosion of the anode may be significantly higher ________ to the connection to the cathode, depending on solution conductivity.A . ParallelB . AdjacentC . DiagonallyD . PerpendicularView AnswerAnswer: B
The sudden rapid fracture under stress (residual or applied) where the material exhibits little or no evidence of ductility or plastic deformation is called _________.
The sudden rapid fracture under stress (residual or applied) where the material exhibits little or no evidence of ductility or plastic deformation is called _________.A . 885º F EmbrittlementB . Temper EmbrittlementC . Stress Corrosion CrackingD . Brittle FractureView AnswerAnswer: D
