Mechanical Engineering - Engineering Materials

21. 

Macro-structure of a material is, generally, examined by

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

Answer: Option A

Explanation:

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22. 

Aluminium has low density and addition of silicon improves its fluidity and therefore, its castability.

A. Correct
B. Incorrect

Answer: Option A

Explanation:

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23. 

Which of the following property is desirable for materials used in tools and machines?

A. Elasticity
B. Plasticity
C. Ductility
D. Malleability

Answer: Option A

Explanation:

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24. 

Babbit metal is a

A. lead-base alloy
B. copper-base alloy
C. tin-base alloy
D. cadmium-base alloy

Answer: Option C

Explanation:

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25. 

The metal suitable for bearings subjected to heavy loads, is

A. silicon bronze
B. white metal
C. monel metal
D. phosphor bronze

Answer: Option B

Explanation:

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