Mechanical Engineering - Engineering Materials

26. 

The compressive strength of cast iron is __________ that of its tensile strength.

A. equal to
B. less than
C. more than

Answer: Option C

Explanation:

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27. 

When a steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of

A. mainly ferrite
B. mainly pearlite
C. ferrite and pearlite
D. pearlite and cementite

Answer: Option C

Explanation:

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28. 

Eutectoid reaction occurs at

A. 600°C
B. 723°C
C. 1147°C
D. 1493°C

Answer: Option B

Explanation:

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29. 

The addition of copper to aluminium possesses maximum strength after heat treatment and age-hardening

A. Correct
B. Incorrect

Answer: Option A

Explanation:

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30. 

Nickel when added to copper improves

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

Answer: Option B

Explanation:

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