Engineering :: Metallurgy
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| 171. |
The crystal structure of alpha iron is |
| A. |
BCC |
B. |
FCC |
| C. |
HCC |
D. |
Cubic |
| E. |
None of the above |
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Answer: Option A
Explanation:
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| 172. |
The highest rate of quenching is possible in |
| A. |
Cold furnace |
B. |
Hot furnace |
| C. |
Air |
D. |
Oil |
| E. |
Water |
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Answer: Option E
Explanation:
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| 173. |
Which of the following hardening process is generally used for non-ferous materials? |
| A. |
Cyaniding |
B. |
Flame hardening |
| C. |
Pack carburizing |
D. |
Age hardening |
| E. |
Nitriding |
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Answer: Option D
Explanation:
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| 174. |
Mild steel has the structure of |
Answer: Option B
Explanation:
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| 175. |
In grey cast iron, carbon is present in the form of |
| A. |
Cementite |
B. |
Flakes |
| C. |
Powder |
D. |
Spheroids |
| E. |
None of the above |
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Answer: Option B
Explanation:
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| 176. |
Killed' steel is |
| A. |
Steel which has been shaped on a power hammer |
B. |
Steel with less than normal percentage of carbon |
| C. |
Steel with more than normal percentage of carbon |
D. |
Steel that has lost its properties due to excessive alloying |
| E. |
That steel which is deoxidised in the ladle with silicon and aluminium |
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Answer: Option E
Explanation:
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| 177. |
The maximum percentage of carbon in ferrite is |
Answer: Option B
Explanation:
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| 178. |
The maximum percentage of carbon in austenite is |
Answer: Option C
Explanation:
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| 179. |
The depth of hardness in steel can be increased by the addition of |
| A. |
Vanadium |
B. |
Sulphur |
| C. |
Tungsten |
D. |
Nickel |
| E. |
Chormium |
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Answer: Option E
Explanation:
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| 180. |
Pure iron has the structure of |
| A. |
Pearlite |
B. |
Austenite |
| C. |
Ferrite |
D. |
Pearlite and austenite |
| E. |
Pearlite, austenite and ferrite |
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Answer: Option C
Explanation:
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