Engineering Materials
When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron.

Cementite
Free graphite
Both A and B
None of these

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Engineering Materials
The unit cells

Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal
May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice
All of these
Have the same orientation and their similar faces are parallel

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Engineering Materials
Inconel contains

80% nickel, 14% chromium and 6% iron
68% nickel, 29% copper and 3% other constituents
65% nickel, 15% chromium and 20% iron
80% nickel and 20% chromium

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Engineering Materials
The temperature required for full annealing in hypereutectoid steel is

30° C to 50° C below upper critical temperature
30° C to 50° C above upper critical temperature
30° C to 50° C above lower critical temperature
30° C to 50° C below lower critical temperature

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