Engineering :: Materials of Construction
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1. |
Austenitic stainless steel is characterized by |
A. |
a body-centred cubic crystal structure |
B. |
a face-centred cubic crystal structure |
C. |
a simple hexagonal crystal structure |
D. |
none of the above |
Answer: Option B
Explanation:
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2. |
Ferritic stainless steel is characterized by |
A. |
a simple hexagonal crystal structure |
B. |
a body-centred cubic crystal structure |
C. |
a face-centred cubic crystal structure |
D. |
none of the above |
Answer: Option B
Explanation:
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3. |
Alpha iron is stable |
A. |
upto 910?C |
B. |
between 910 and 1403?C |
C. |
above 1403?C |
D. |
above 2000?C |
Answer: Option A
Explanation:
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4. |
An increase in the carbon content of a steel |
A. |
increases its strength |
B. |
decreases its strength |
C. |
increases its ductility |
D. |
none of the above |
Answer: Option A
Explanation:
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5. |
An increase in the carbide/graphite ratio in cast iron tends to |
A. |
increase the hardness |
B. |
increase the brittleness |
C. |
decrease the ductility |
D. |
all of the above |
Answer: Option D
Explanation:
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6. |
Cementite |
A. |
is a compound of iron and carbon |
B. |
is characterized by an orthorhombic crystal structure |
C. |
has the approximate chemical formula Fe3C |
D. |
all of these answers |
Answer: Option D
Explanation:
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7. |
In martensitic stainless steel the difference between the chromium percentage and seventeen times the carbon content is |
A. |
less than 12.5% |
B. |
greater than 12.5 % |
C. |
greater than 24% |
D. |
less than 18% |
Answer: Option A
Explanation:
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8. |
In ferritic stainless steel the difference between the chromium percentage and seventeen times the carbon content is |
A. |
less than 24% |
B. |
greater than 24 % |
C. |
greater than 12.5% |
D. |
less than 12.5% |
Answer: Option D
Explanation:
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9. |
The carbon content is steel varies from |
A. |
0.1 to 1.50% |
B. |
0.35 to 2.5% |
C. |
2 to 4% |
D. |
5 to 8% |
Answer: Option A
Explanation:
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10. |
The percentage of carbon is the least in |
A. |
white cast iron |
B. |
grey cast iron |
C. |
wrought iron |
D. |
stainless steel |
Answer: Option C
Explanation:
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