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Engineering Materials - Section 1 (3)

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Engineering Materials - Section 1

17. 

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:

No answer description available for this question.

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18. 

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:

No answer description available for this question.

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19. 

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:

No answer description available for this question.

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20. 

Haematite iron ore contains iron about

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

Answer: Option D

Explanation:

No answer description available for this question.

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21. 

The lower critical point for all steels is

A. 600°C
B. 700°C
C. 723°C
D. 913°C

Answer: Option C

Explanation:

No answer description available for this question.

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22. 

Cast iron is manufactured in

A. blast furnace
B. cupola
C. open hearth furnace
D. bessemer converter

Answer: Option B

Explanation:

No answer description available for this question.

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23. 

The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is

A. chromium
B. nickel
C. vanadium
D. cobalt

Answer: Option D

Explanation:

No answer description available for this question.

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24. 

Silicon when added to copper improves

A. machinability
B. hardness
C. hardness and strength
D. strength and ductility

Answer: Option C

Explanation:

No answer description available for this question.

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