Mechanical Engineering - Engineering Materials

31. 

Haematite iron ore contains iron about

A. 30%
B. 45%
C. 55%
D. 70%

Answer: Option D

Explanation:

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32. 

The material in which the atoms are arranged regularly in some directions but not in others, is called

A. amorphous material
B. mesomorphous material
C. crystalline material
D. none of these

Answer: Option B

Explanation:

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33. 

The steel produced by bessemer or open hearth process is __________ to that produced by L-D process.

A. superior
B. inferior

Answer: Option B

Explanation:

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34. 

Crystal structure of a material is, generally, examined by

A. naked eye
B. optical microscope
C. metallurgical microscope
D. X-ray techniques

Answer: Option D

Explanation:

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35. 

Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

A. eutectic cast irons
B. hypo-eutectic cast irons
C. hyper-eutectic cast irons
D. none of these

Answer: Option B

Explanation:

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