Steels containing up to 3% to 4% of one or more alloying elements are known as ________

The term high alloy steels is used for alloy steels containing more than ___ of alloying elements.

A

10%

B

20%

C

50%

D

70%

Steels containing more than 5% of one or more alloying elements are known as ________

A

HSLA steels

B

High alloy steels

C

Tool and die steels

D

Stainless steels

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

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'

Alloy steels containing 0.05% to 0.15% of alloying elements are called _______

A

Weathering steel

B

Stainless steel

C

Tool and die steel

D

Microalloyed steel

Apart from alloying, name a material that is used instead of ferritic steels to increase the ultimate strength of unalloyed steels.

A

Chromium

B

Molybdenum

C

Austenitic steel

D

None of the mentioned

Consider the following statements and select which of the following statement are true. Statement 1: The maximum sum rectangle can be 1X1 matrix containing the largest element If the matrix size is 1X1 Statement 2: The maximum sum rectangle can be 1X1 matrix containing the largest element If all the elements are zero Statement 3: The maximum sum rectangle can be 1X1 matrix containing the largest element If all the elements are negative

A

Only statement 1 is correct

B

Only statement 1 and Statement 2 are correct

C

Only statement 1 and Statement 3 are correct

D

Statement 1, Statement 2 and Statement 3 are correct

Which of the following pairs regarding the effect of alloying elements in steels are not matched correctly?

A

Cobalt: It contributes to rerl hardness by hardening ferrite

B

Molybdenum: It forms abrasion resisting particles

C

Phosphorous: It improves machinability in free cutting steels

D

Silicon: It reduces oxidation resistance

Maraging steels have main alloying elements rare earth metals.

A

True

B

False

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

A

11.5 - 18 %

B

14 - 27 %

C

20 - 25 %

D

20 - 30%

Steels containing up to 3% to 4% of one or more alloying elements are known as ________

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