Mechanical Engineering - Engineering Materials

11. 

The alloying element which reduces the formation of iron sulphide in steel is

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

Answer: Option D

Explanation:

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12. 

For a steel containing 0.8% carbon

A. there is no critical point
B. there is only one critical point
C. there are two critical points
D. there can be any number of critical points

Answer: Option B

Explanation:

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13. 

In high speed steels, manganese is used to tougher the metal and to increase its

A. yield point
B. critical temperature
C. melting point
D. hardness

Answer: Option B

Explanation:

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14. 

The machinability of aluminium increases when __________ is added to aluminium.

A. copper
B. magnesium
C. silicon
D. lead and bismuth

Answer: Option D

Explanation:

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15. 

Body centred cubic space lattice is found in

A. zinc, magnesinm, cobalt, cadmium, antimony and bismuth
B. gamma-iron, aluminium, copper, lead, silver and nickel
C. alpha-iron, tungsten, chromium and molybdenum
D. none of the above

Answer: Option C

Explanation:

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