Which of the following alloying elements increase resistance of steel to atmospheric corrosion?

Consider the following two C code segment. Y and X are one- and two-dimensional arrays of size n and n × n respectively, where 2 ≤ n ≤ 10. Assume that in both code segments, elements of y are initialized to 0 and each element X[i] [j] of array X is initialized to i + j. Further assume that when stored in main memory all elements of x are in same main memory page frame. Code segment 1: //initialize elements of y to 0 //initialize elements X[i] [j] of X to i+j for (i = 0; i < n; i++) Y[i] += X[0] [i]; Code Segment 2: //initialize elements of Y to 0 //initialize elements X[i] [j] of X to i+j for (i = 0; i < n; i++) Y[i] += X[i] [0]; Which of the following statements is/are correct? S1: Final contents of array Y will be same in both code segments S2: Elements of array X accessed inside the for loop shown in code segment 1 are contiguous in main memory S3: Elements of array X accessed inside the for loop shown in code segment 2 are contiguous in main memory

A

Only S3 is correct

B

Only S2 is correct

C

Only S1 and S2 are correct

D

Only S1 and S3 are correct

Assertion 'a': Hardenability of steel can be increased by adding certain alloying elements.
Reason 'r': The alloying elements can provide a fine dispersion of alloy carbides

A

Both 'a' and 'r' are true, but 'r' is not a correct reason for 'a'

B

Both 'a' and 'r' are false

C

'a' is true but 'r' is false

D

Both 'a' and 'r' are true and 'r' is a correct reason for 'a'

Assertion 'a': During casting of aluminium, grain refinement can be achieved by addition of certain alloying elements.
Reason 'r': The addition of the alloying elements may result in the formation of deoxidation products or intermetallic compounds which may act as nucleation sites for grain refinement.

A

Both 'a' and 'r' are true, but 'r' is not the reason for 'a'

B

Both 'a' and 'r' are true and 'r' is the reason for 'a'

C

'a' is true but 'r' is false

D

'a' is false but 'r' is true

Which one of the following alloying elements increases the corrosion resistance of steel?

A

Vanadium

B

Chromium

C

Nickel

D

Copper

Which of the following alloying element of stainless steel that attributes a large increase in stress-corrosion resistance?

A

Nickel

B

Chromium

C

Carbon

D

Nickel and chromium

Which one of the following sets is incorrect to show the inter-relationships among price elasticity coefficient, change in price and change in total revenue ? Price elasticity coefficient Change in price Change in Total Revenue 1) Zero Increase Decrease Increase Decrease (2) Less than 1 Increase Decrease Decrease Increase (3) Equal to 1 Increase Decrease No change No change (4) More than 1 Increase Decrease Decrease Increase

A

(1)

B

(2)

C

(3)

D

(4)

Corrosion of less corrosion-resistant metal is usually increased and the attack of the more corrosion-resistant is decreased in galvanic corrosion.

A

True

B

False

Consider the following statements about the Atmospheric pressure phenomenon and identify the correct ones. Atmospheric pressure is basically a force in any area pushed by any surface by the weight of the Earth's atmosphere. The atmospheric pressure increases with an increase in the altitude for any region. The earth's rotation affects the pressure of the atmosphere in various ways.

A

Only 1 & 2

B

Only 2 & 3

C

Only 1 & 3

D

None of the above

Consider the following statements regarding corrosion of ceramic material: 1. Ceramic materials are much better suited to withstand most of these environments for reasonable time periods than are metals. 2. Corrosion of ceramic materials generally involves simple chemical dissolution, in contrast to the electrochemical processes found in metals. 3. Ceramic materials are not frequently used because of their non-resistance to corrosion. Which of the above statements is/are correct?

A

1 and 3 only

B

2 and 3 only

C

3 only

D

1 and 2 only

Which of the following corrosion form is considered as the intermediate stage between uniform corrosion and complete corrosion resistance?

A

Galvanic corrosion

B

Pitting corrosion

C

Intergranular corrosion

D

Erosion corrosion

Which of the following alloying elements increase resistance of steel to atmospheric corrosion?

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