最新なAPI API-571問題集（112題）、真実試験の問題を全部にカバー！

質問 1：
In most cases, brittle fracture occurs only at:
A. Temperatures above the Charpy impact transition temperature
B. Temperatures below the Charpy impact transition temperature
C. Temperatures below ambient in thick sections
D. High temperatures in areas of high stress concentration
正解：B
解説: (Pass4Test メンバーにのみ表示されます)

質問 2：
Both sulfide stress corrosion cracking and stress-oriented hydrogen-induced cracking are most often found in:
A. Hardened steels.
B. Steel weldments.
C. Areas with temperatures above 300°F (149°C).
D. Areas where there is significant hydrogen blistering.
正解：A
解説: (Pass4Test メンバーにのみ表示されます)

質問 3：
During inspection of a process unit where sulfidation from high-temperature hydrogen exists in H#S streams, the inspector should:
A. Take boat samples and send them to the lab for metallographic analysis
B. Use angle beam ultrasonic testing to look for cracking at the mid-wall
C. Use ultrasonic testing or radiographic testing thickness readings to monitor for loss of wall thickness
D. Use penetrant testing and magnetic-particle testing to look for surface-breaking cracks
正解：C
解説: (Pass4Test メンバーにのみ表示されます)

質問 4：
Which of the following is a contributing factor in caustic corrosion?
A. Iron oxide concentration
B. Boiler feed water hardness
C. Heat traced equipment
D. Alkalinity of superheated steam
正解：C
解説: (Pass4Test メンバーにのみ表示されます)

質問 5：
The likelihood of brittle fracture is best lessened by:
A. Frequent inspection of the piping or equipment involved
B. Using thicker construction materials to lower the resulting stress
C. Postweld heat treatment (PWHT)
D. Using carbon or low-alloy steels
正解：C
解説: (Pass4Test メンバーにのみ表示されます)

質問 6：
Which of the following can cause hydrogen embrittlement of carbon steel?
A. Welding with wet electrodes
B. Improper postweld heat treatment (PWHT)
C. High-temperature hydrogen attack (HTHA)
D. Cleaning and pickling in caustic solutions
正解：B
解説: (Pass4Test メンバーにのみ表示されます)