Mechanical Engineering - Engineering Materials

26. 

Tungsten when added to steel __________ the critical temperature.

A. does not effect
B. lowers
C. raises

Answer: Option C

Explanation:

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27. 

Silicon when added to copper improves

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

Answer: Option C

Explanation:

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28. 

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:

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29. 

Cast iron is manufactured in

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

Answer: Option B

Explanation:

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30. 

The lower critical point for all steels is

A. 600°C
B. 700°C
C. 723°C
D. 913°C

Answer: Option C

Explanation:

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