260. Reinforcing bars used in RCC slabs are made of
A.Cast iron
B.Wrought iron
C.Alloy steel
D.Medium carbon steel
261. Eutectoid steels have structure of
A.Pearlite alone
B.Phases of ferrite and pearlite
C.Phases of cementite and pearlite
D.Phases of ferrite and cementite
262. Typical examples of products produced by powder metallurgy are
A.Refractory metals like tungsten, molybdenum etc.
B.Super hard materials like cemented carbides
C.Bearings and porous metallic parts
D.All of the above
263. Metal powder for powder metallurgy process is made by
A.Reduction of oxide
B.Electrolytic deposition
C.Milling or grinding
D.Anyone of the above
264. Hypoeutectoid steels have structure of
A.Pearlite alone
B.Phases of ferrite and pearlite
C.Phases of cementite and pearlite
D.Phases of ferrite and cementite
265. When steel with 0.8% carbon is cooled from temperature of 950°C the pearlite would occur at the following fixed temperature
A.910°C
B.850°C
C.770°C
D.723°C
266. Copper and aluminium have tendency to absorb following gas at high temperature
A.CO2
B.N2
C.NH3
D.H2
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