Which of the following types of corrosion has been seen in stainless steels in high purity water containing oxygen?

What will be the % purity of a solute? \) × 100 b) % purity = \(\) × 100 c) % purity = \( \) × 100 d) % purity = \(\) × 100

A

% purity = \( \) × 100

B

\frac{\int_{t1}^{t2} CAdt}{\int_{t1}^{t2} CAdt + \int_{t1}^{t2} CBdt}

C

\frac{\int_{t1}^{t2} CAdt}{\int_{t1}^{t2} CAdt + \int_{t1}^{t2} CBdt}

D

\frac{\int_{t1}^{t2} CAdt}{\int_{t1}^{t2} CAdt + \int_{t1}^{t2} CBdt}

Which of the following statements is correct regarding the oxidation number of Oxygen? I. The oxidation number of Oxygen in most compounds is -2. II. When Oxygen is bonded to Fluorine in compounds like Oxygen difluoride and Dioxygen diflouride, the Oxygen is assigned an oxidation number of +2 and +2 respectively. III. In peroxide, an Oxygen atom is assigned an oxidation number of -1 and in Superoxide, each oxygen atom is assigned an oxidation number of -1/2.

A

I only

B

II only

C

I and III only

D

I, II, and III

Which of the following types of corrosion in which stainless steels are more susceptible than ordinary steels?

A

Pitting corrosion

B

Stress-corrosion cracking

C

Intergranular corrosion

D

Stress-corrosion cracking, pitting and intergranular corrosion

Ferric stainless steels compared to austenitic stainless steels

A

Have lower corrosion resistance

B

Are harder to fabricate

C

Are less ductile and hence less suitable for cold pressing

D

All of the above

Why straight chromium stainless steels and austenitic stainless steels are not recommended for hydrofluoric acid applications?

A

Due to susceptibility to crevice

B

Due to limited corrosion resistance

C

Due to susceptibility to pitting

D

Sensitive to erosion-corrosion

Given below are three quantities named A, B and C. Based on the given information, determine the relation among the three quantities. Quantity A∶ A 30 litre mixture of wine and water has wine and water in the ratio 5∶ 7. How much water must be drawn off so that the ratio of wine and water becomes 25∶ 19? Quantity B∶ A 35 litre mixture of wine and water has wine and water in the ratio 1∶ 3. How much water must be drawn off so that the ratio of wine and water becomes 1.75∶ 3.35? Quantity C∶ A 27 litre mixture of wine and water has wine and water in the ratio 3∶ 2. How much water must be drawn off so that the ratio of wine and water becomes 81∶ 11?

A

A = B = C

B

A > B > C

C

B > C > A

D

A > C > B

E

A < B > C

Ferritic stainless steels are straight chromium steels containing . . . . . . . . percent chromium.

A

11.5 - 18 %

B

14 - 27 %

C

20 - 25 %

D

20 - 30%

Mine water flowing at 1.5 m³/s with 2 mg/l dissolved oxygen, joins riverwater flowing at 7 m³/s containing 6 mg/l dissolved oxygen. The saturated value of the dissolved oxygen in the mixture is given to be 9.3 mg/l. On the basis, the initial oxygen deficit of the mixture in mg/l is

A

2.4

B

4.0

C

6.8

D

14.6

Stainless steels containing small quantities of platinum passivates more readily in the presence of oxygen, ferric salts, and other oxidizing agents.

A

False

B

True

Stainless steels with high strength, but low corrosion resistance are known as _______

A

Austenitic stainless steel

B

Ferritic stainless steel

C

Martensitic stainless steel

D

Duplex stainless steel

Which of the following types of corrosion has been seen in stainless steels in high purity water containing oxygen?

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