최신 API-571 무료덤프 - API Corrosion and Materials Professional

문제1

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

정답: C

설명: (DumpTOP 회원만 볼 수 있음)

문제2

Naphthenic acid corrosion (NAC) is most severe in what phase of flow?

A. Vapor phase

B. Two phase

C. Water phase

D. Hydrocarbon phase

정답: B

설명: (DumpTOP 회원만 볼 수 있음)

문제3

How can temper embrittlement be prevented if a material contains critical levels of the appropriate impurity elements and is exposed in the embrittling temperature range?

A. Postweld heat treatment (PWHT) of repairs

B. Embrittlement cannot be prevented

C. Specification of Charpy V-notch impact test

D. Use of a controlled pressurization sequence

정답: C

설명: (DumpTOP 회원만 볼 수 있음)

문제4

Which of the following statements is most accurate with regard to thermal fatigue?

A. Controlled rates of heating and cooling during startup and shutdown can lower stresses

B. Visual examination is an ineffective method of monitoring thermal fatigue

C. Because of their ductility, carbon steels have lower resistance to thermal fatigue

D. Thermal fatigue cracks generally initiate on the interior of a component due to high thermal stress

정답: A

설명: (DumpTOP 회원만 볼 수 있음)

문제5

Decarburization damage is normally verified by:

A. Impact testing

B. Tensile testing

C. Metallographic testing

D. Bend testing

정답: C

설명: (DumpTOP 회원만 볼 수 있음)

문제6

In what damage mechanism does hydrogen combine with carbides in steel to form bubbles or cavities of CH#?

A. Hydrogen embrittlement

B. High temperature hydrogen attack

C. Hydrogen-induced cracking

D. Hydrogen blistering

정답: B

설명: (DumpTOP 회원만 볼 수 있음)

문제7

Corrosion rates of carbon steel pipe in sulfuric acid service increase significantly:

A. At acid concentrations below 65%

B. At acid concentrations above 65%

C. At acid concentrations above 95%

D. In stagnant conditions

정답: A

설명: (DumpTOP 회원만 볼 수 있음)

문제8

To detect wet insulation that might give rise to corrosion under insulation, which nondestructive examination (NDE) technique would be most useful?

A. Spectroscopy

B. Low-intensity X-ray imaging scope

C. Deep penetrating eddy current

D. Neutron backscatter

정답: D

설명: (DumpTOP 회원만 볼 수 있음)

문제9

Microbiologically induced corrosion is largely independent of the:

A. Velocity of the flow stream

B. Presence of hydrogen sulfide

C. Water content of the process

D. pH of the fluid

정답: A

설명: (DumpTOP 회원만 볼 수 있음)

문제10

Carbonate stress corrosion cracking and alkaline stress corrosion cracking are:

A. Different only in the level of alkalinity needed to initiate attack.

B. Mechanisms that affect carbon steels and austenitic stainless steels.

C. Not preventable by post-fabrication stress relieving of weldments.

D. Closely related corrosion mechanisms.

정답: D

설명: (DumpTOP 회원만 볼 수 있음)

최신 API-571 무료덤프 - API Corrosion and Materials Professional

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