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Engineering Materials

Engineering Materials
The percentage of carbon in low carbon steel is

0.05%
0.15%
0.3%
0.5%

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Engineering Materials
Which of the following is not the correct method of increasing fatigue limit?

Cold working
Surface decarburisation
Nitriding of surface
Shot peening

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Engineering Materials
When medium carbon steel is heated to coarsening temperature

There is no change in grain size
The grain size first increases and then decreases very rapidly
The grain size increases very rapidly
The average grain size is a minimum

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Engineering Materials
The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is

Below recrystallization temperature
770°C
1050°C
910°C

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Engineering Materials
Brass contains

90% copper and 10% tin
70% copper and 30% zinc
70 - 75% copper and rest tin
85 - 92% copper and rest tin with little lead and nickel

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Engineering Materials
The hardness of steel primarily depends on

Percentage of carbon
Shape of carbides and their distribution in iron
Heat treatment employed
Percentage of alloying elements

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