Steel hardness, __________ and stress are critical factors in causing hydrogen stress cracking.
A. Alloy composition
B. Temperature
C. Strength
D. None of the above
正解:C
質問 2:
A minimum of ________ to ______ molybdenum is needed in an alloy to resist naphthenic acid corrosion.
A. 2%, 2 1/2 %
B. 1%, 2%
C. 1 1/2 %, 2 1/2 %
D. 2%, 3%
正解:A
質問 3:
Damage due to __________ is not visible and can only be observed by metallographic examination.
A. Cavitation
B. Brittle fracture
C. Galvanic corrosion
D. Graphitization
正解:D
質問 4:
The grain size has an important influence on the high temperature ductility and on the reheat cracking susceptibility. A ________ grain size results in _______ ductile heat affected zones, making the material more susceptible to reheat cracking.
A. Small. Less
B. Large, more
C. Small, More
D. Large, Less
正解:D
質問 5:
The primary factors affecting high temperature oxidation are metal temperature and _______.
A. Oxygen
B. Stress
C. Alloy composition
D. Pressure
正解:C
質問 6:
Blistering, HIC and SOHIC have been found to occur between ambient and ________.
A. 300(o) F
B. 350(o) F
C. 400(o) F
D. 250(o) F
正解:A
Hanazawa -
内容がしっかり覚えて、API-571試験を合格できました。これからもPass4Testでほかの問題集を購入する予定があります。