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Engineering Materials

Engineering Materials
Which is false statement about case hardening? Case hardening is done by

Nitriding
Electroplating
Induction hardening
Cyaniding

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Engineering Materials
Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio

50 : 20 : 10 : 20
40 : 30 : 20 : 10
30 : 20 : 30 : 20
50 : 20 : 20 : 10

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Engineering Materials
Hardness of martensite is about

RC 48
RC 80
RC 65
RC 57

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Engineering Materials
Acidic solution is one which has pH value

Greater than 7
pH value has nothing to do with neutral solution
Equal to 7
Less than 7

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

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

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Engineering Materials
The machinability of steel is improved by adding

Nickel
Nickel and chromium
Chromium
Sulphur, lead and phosphorus

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