Question 1

Carbon steel is susceptible to SCC when used in ___________ service.

Options :

A : Hydrogen

B : Ammonia

C : High temperature

D : High pressure

Answer: B

Question 2

Dissimilar weld metal cracking occurs because the coefficients of thermal expansion between ferritic steels and 300 Series stainless steels differ by ________ or more.

Options :

A : 10%

B : 15%

C : 20%

D : 30%

Answer: D

Question 3

Thermal fatigue cracks usually propagate _______ to the stress and they are usually dagger-shaped.

Options :

A : Parallel

B : Diagonal

C : Transverse

D : Across

Answer: C

Question 4

Which of the following materials are generally not suitable for HF service?

Options :

A : 300 Series SS

B : Carbon steel

C : 400 Series SS

D : Both A and C

Answer: D

Question 5

Soil to Air interface areas are usually more susceptible to corrosion than the rest of the structure because of ___________ and __________ availability.

Options :

A : Moisture

B : Bacteria

C : Oxygen

D : B and C

E : A and C

Answer: A