Corrosion and Materials Professional v5.0 (API-571)

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Total 454 questions

_________ corrosion rates are found in a gas oil desulfurizers and hydrocrackers than naphtha desulfurizers and hydrocrackers by a factor of almost 2.

  • A. Lower
  • B. Higher
  • C. Sulfidization
  • D. Hydrogen corrosion


Answer : B

Convert these temperatures – 156º C and 450º F

  • A. 304º F, 151º C
  • B. 284º F, 218º C
  • C. 312º F, 232º C
  • D. 296º F, 246º C


Answer : C

300 Series SS is susceptible to LME when it comes in contact with molten ________.

  • A. Cadmium
  • B. Mercury
  • C. Zinc
  • D. Lead


Answer : C

In fired heater tubes, dissimilar weld metal cracking forms primarily on the _______ of the material.

  • A. Outside
  • B. Inside
  • C. Welds
  • D. All of the above


Answer : A

A form of mechanical fatigue in which cracks are produced as a result of dynamic loadings is _______.

  • A. Spheroidization
  • B. Vibration-induced cracking
  • C. Fatigue cracking
  • D. Stress cracking


Answer : B

The creep threshold temperature for 1 ¼, 2 ¼, 5 and 9 Cr is ________.

  • A. 600º F
  • B. 700º F
  • C. 800º F
  • D. 1000º F


Answer : C

Thermal fatigue damage is in the form of cracking that may occur anywhere in a metallic component where relative movement is constrained, particularly under repeated
__________.

  • A. Cyclic stresses
  • B. Thermal cycling
  • C. Pressure variations
  • D. All of the above


Answer : B

With sour water corrosion, at a given pressure, the HS concentration in the sour water
_________ as temperatures ________.

  • A. Increases, increases
  • B. Decreases, decreases
  • C. Increases, decreases
  • D. Decreases, increases


Answer : D

Mitigation of CUI is best achieved by _________.

  • A. A properly documented inspection program
  • B. A properly installed insulation system
  • C. A properly applied coating system
  • D. A properly documented NDE program


Answer : C

Carburization can be confirmed by a substantial increase in hardness and a _______ in ductility.

  • A. Loss
  • B. Gain
  • C. Change
  • D. None of the above


Answer : A

The best method to inspect for SCC is ____.

  • A. WFMT
  • B. UT Shear wave
  • C. AET
  • D. All of the above


Answer : A

Which of the following materials are subject to mechanical fatigue?

  • A. Carbon steels
  • B. Stainless steels
  • C. Low alloy steels
  • D. All of the above


Answer : D

____________ is a form of environmental cracking that can initiate on the surface of high strength low alloy steels and carbon steels with highly localized zones of high hardness in the weld metal and HAZ as a result of exposure to aqueous HF acid service.

  • A. Sulfide stress cracking
  • B. Hydrogen stress cracking
  • C. Caustic stress cracking
  • D. Hydrogen induced cracking


Answer : B

Hydrogen stress cracking is the same mechanism that is responsible for sulfide stress corrosion cracking in wet HS environments except that HF acid is generating the
__________.

  • A. Sulfide
  • B. Caustic
  • C. Hydrogen
  • D. Water


Answer : C

What treatment is used to prevent boiler feed water corrosion?

  • A. Oxide scavengers are added to process
  • B. Oxygen scavengers are added to process
  • C. Sulfide scavengers are added to process
  • D. Sulfur scavengers are added to process


Answer : B

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Total 454 questions