Matallurgy and Material Engineering Mid - II, November - 2014

1.The objective of normalizing a steel specimen is _______
  • to reduce hardness
  • to relieve stresses
  • to refine structure
  • to improve ductility
Answer: C
2.During pearlitic transformations
  • New phases form
  • Crystal structures change
  • Compositions of phases
  • All of the above
Answer: D
3.The unit of the diffusion coefficient D is
  • ms-2
  • m-2s-1
  • m2s-1
  • m2s
Answer: C
4.Polymers are ___________ in nature.
  • Organic
  • Inorganic
  • Both (a) and (b)
  • synthetic
Answer: C
5.CMC materials with a low fiber content ____________
  • Low tensile strength
  • low bending strength
  • High tensile strength
  • High bending Strength
Answer: C
6.The atomic bonding in ceramics is
  • Ionic
  • Covalent
  • Vander Waals
  • Partially ionic and partially covalent
Answer: C
7.Which is not a characteristic property of ceramic material?
  • High temperature stability
  • high mechanical strength
  • Low elongation
  • low hardness
Answer: A
8.________ is/ are the main limitation/s of aluminum- copper alloys.
  • poor corrosion resistance
  • high reflectivity
  • high thermal conductivity
  • a, b, & c
Answer: A
9.In the PTFE (Teflon) monomer, the four side groups are
  • F,F,F,F
  • H,H,H,H
  • H,H,H,Cl
  • H,H,H,CH3
Answer: C
10.__________ is an inorganic, nonmetallic material which cools to a rigid solid without crystallization
  • silicon carbide
  • glass
  • calcium oxide
  • silicon dioxide
Answer: B
11.Alloying element that decreases eutectoid temperature in Fe-C system is __________.
Answer: Ni
12.Recovery, recrystallization, and grain growth are different phases of _______ working process.
Answer: Hot working
13.PTFE has the _________________ side group in the monomer.
Answer: Bulkiest
14._______ is an alloy of copper and zinc
Answer: Brass
15.Composites containg more than one type of fiber are called ___________ composites.
Answer: Hybrid
16.Abbreviation of PAN is _______________.
Answer: Poly acryl nitride
17.Glass has ___________ properties
Answer: Electric insulator
18._______ working process decreases the ductility of the material.
Answer: Cold
19.The microstructure of a material after recrystallization consists of __________ grains
Answer: Fine
20.High conversions in short durations are possible in ___________ type of polymerization.
Answer: Emulsion