337. Hardness of ferrite is of the order of
A.10 BHN
B.20 BHN
C.35 BHN
D.50 BHN

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338. Hardness of cementite is of the order of
A.100 BHN
B.600 BHN
C.1100 BHN
D.1400 BHN

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339. Polymerisation is associated with
A.Stainless steel
B.Cast iron
C.Aluminium
D.Thermoplastic plastic

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340. The most notable precipitation hardenable alloys are those in which the base metal is
A.Copper
B.Nickel
C.Manganese
D.Aluminium

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341. In order for an alloy system to be capable of precipitation hardening it is essential that the equilibrium diagram shows a decreasing solubility of one component in another
A.Constant temperature
B.With decreasing temperature
C.With increasing temperature
D.Below room temperature

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342. In structure, all metals are
A.Crystalline
B.Granular
C.Wrought
D.Amorphous

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343. Which of the following is non-destructive test
A.Tensile test
B.Radiography test
C.Charpy test
D.Cupping test

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