API API Certifications API-571 Questions & Answers

• Question 71:

  Blistering, HIC and SOHIC have been found to occur between ambient and ________.

  A. 250º F

  B. 300º F

  C. 350º F

  D. 400º F

  Correct Answer: B

• Question 72:

  MIC is often characterized by _______ within pits in carbon steel.

  A. Oxide

  B. Tubercles

  C. Worm holes

  D. Cup shaped pits

  Correct Answer: D

• Question 73:

  In most cases, brittle fracture occurs only at temperatures below the Charpy impact transition temperature. Steel cleanliness and ________ have a significant influence on toughness and resistance to brittle fracture.

  A. Alloy composition

  B. Tensile strength

  C. Grain size

  D. Pressure

  Correct Answer: C

• Question 74:

  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 increases

  B. Stress endurance

  C. Pressure decreases

  D. None of the above

  Correct Answer: B

• Question 75:

  _________ is the sudden rapid fracture under stress (residual or applied) where the material exhibits little or no evidence of ductility or plastic deformation.

  A. Thermal fatigue

  B. Thermal shock

  C. Brittle fracture

  D. Stress fracture

  Correct Answer: C

• Question 76:

  SCC usually occurs at pH values above two (2). SCC tendency __________ toward the alkaline pH region

  A. Increases

  B. Decreases

  C. Stabilizes

  D. None of the above

  Correct Answer: B

• Question 77:

  The extent and depth of decarburization is a function of temperature and ______.

  A. Pressure

  B. Material properties

  C. Exposure time

  D. Velocity

  Correct Answer: C

• Question 78:

  Sulfidation of iron-based alloys usually begins at metal temperatures above _____.

  A. 500º F

  B. 600º F

  C. 800º F

  D. 1000º F

  Correct Answer: A

• Question 79:

  In HF service, carbon steel operating above ________ should be closely monitored for loss in thickness and may need to be upgraded to Alloy 400.

  A. 150º F

  B. 175º F

  C. 160º F

  D. 200º F

  Correct Answer: A

• Question 80:

  Cavitation is best prevented by avoiding conditions that allow the absolute pressure to fall below the ___________ of the liquid or by changing the material properties.

  A. Minimum pressure

  B. Pressure/vapor ratio

  C. Maximum pressure

  D. Vapor pressure

  Correct Answer: D