Matallurgy and Material Engineering Mid - I, September - 2014

1.Crystal structure of copper is
  • BCC
  • HCP
  • SC
  • FCC
Answer: D
2.In an Annealing Process, cooling is done in
  • Air
  • furnace
  • oil
  • water
Answer: B
3.Nitriding is accomplished by heating the steel in the presence of nitrogen at a temperature of about
  • 7180C
  • 11500C
  • 5500C
  • 8500C
Answer: C
4.The percentage of zinc in Muntz metal is about
  • 20
  • 30
  • 40
  • 15
Answer: C
5.The following elements form carbides in alloy steels
  • Ni, Si
  • Ti, V
  • S, P
  • Mo, Cr
Answer: B
6.Addition of lead and bismuth to aluminum improves its
  • machinability
  • hardness
  • Strength
  • toughness
Answer: A
7.Which of the following alloys have the highest specific strength of all the structural materials?
  • Cu alloys
  • Ti alloys
  • Al alloys
  • steels
Answer: C
8.Addition of nickel to copper improves its
  • hardness
  • corrosion resistance
  • conductivity
  • transparence
Answer: B
9.Crystal structure of cementite is
  • orthorhombic
  • BCC
  • HCP
  • FCC
Answer: A
10.What is the eutectic mixture?
  • pearlite
  • cementite
  • ledburite
  • martensite
Answer: C
11._______ is a process in which material is heated above the critical temperatures, holding it there for a considerable time, and then allowing it to cool in the air.
Answer: Normalizing
12.Recovery, recrystallization, and grain growth are different stages of _______ of cold worked material
Answer: Annealing
13._______ working process decreases the ductility of the material.
Answer: Cold
14.The main limitation of _______ -alloys of titanium is their relatively poor ductility due to HCP crystal structure
Answer: alpha
15._______ is an alloy of copper and zinc
Answer: Brass
16.A ____________ is a material system consisting of two or more distinct phases whose combination results in properties that differ from those of its constituents.
Answer: Refractory material / composite
17.______ material has more compressive strength than tensile strength.
Answer: ceramic/ cost iron
18.Boron in steel increases its _________________
Answer: hardenability
19.The super saturated solution of carbon in ________ iron is known as martensite.
Answer: BCT
20.The solubility of carbon in alpha Iron is ___________ then that in gamma Iron.
Answer: Lower