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Engineering Materials - Interview Questions and Answers

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151. Ferromagnetic alpha iron exists in temperature range of
A. below 723�C
B. 770 - 910�C
C. 910-1440�C
D. 1400-1539�C
E. above 1539�C.
Explanation:
152. Hardness of steel depends on
A. amount of carbon it contains
B. the shape and distribution of the car-bides in iron
C. method of fabrication
D. contents of alloying elements
E. the quality of ore from which it is made.
Explanation:
153. Depth of hardness of steel is increased by addition of
A. nickel
B. chromium
C. tungsten
D. vanadium
E. ell of the above.
Explanation:
154. Railway rails are normally made of
A. mild steel
B. alloy steel
C. high carbon
D. tungsten steel
E. cast iron steel.
Explanation:
155. Which is false statement about normalising. Normalising is done to
A. refine grain structure
B. reduce segregation in casting
C. improve mechanical properties
D. induce stresses-
E. relieve internal stresses.
Explanation:
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