Q.1
In powder metallurgy, how is the powder for brittle materials prepared?
  • a) Pulverization
  • b) Atomization
  • c) Electrolysis
  • d) Fusion
Q.2
What is the disadvantage of atomization?
  • a) Electrical resistivity
  • b) Oxidation
  • c) Poor mechanical strength
  • d) Coarse grains
Q.3
Electrolysis usually used for materials like _________
  • a) Zinc, cadmium
  • b) Aluminum, nickel
  • c) Silver, tin
  • d) Silicon, antimony
Q.4
In gravity compaction, the die is made of _________
  • a) Graphite
  • b) Lead
  • c) Charcoal
  • d) Quartz
Q.5
Sintering is performed ___________
  • a) At room temperature
  • b) Below melting point
  • c) Above boiling point
  • d) At cryogenic temperature
Q.6
For cemented carbide cutting tools, the compact is heated at __________
  • a) 650 F
  • b) 1200 F
  • c) 1989 F
  • d) 2750 F
Q.7
_________ is the process done to reduce the void space in the sintered part.
  • a) Sizing
  • b) Coining
  • c) Machining
  • d) Infiltration
Q.8
Impregnation of sintered parts is usually done for _________
  • a) 2-5 minutes
  • b) 10-20 minutes
  • c) 30-50 minutes
  • d) 80-120 minutes
Q.9
The size of pig iron is _________ (in inches).
  • a) 10*6*2
  • b) 20*9*4
  • c) 15*12*6
  • d) 20*14*8
Q.10
How much carbon does pig iron contain?
  • a) 0.1-1.0%
  • b) 0.3-0.7%
  • c) 1-3%
  • d) 3-4%
Q.11
Why is sulfur in pig iron kept low?
  • a) Steel impurity
  • b) Electrical resistivity
  • c) Demagnetizing effect
  • d) Low coefficient of expansion
Q.12
How much manganese does ferromanganese contain?
  • a) 10-16%
  • b) 22-32%
  • c) 45-62%
  • d) 74-82%
Q.13
The smelting zone of the furnace is called as _________
  • a) Tuyere
  • b) Inwall
  • c) Bosh
  • d) Hearth
Q.14
Which is the iron ore processed in blast furnaces?
  • a) Hematite
  • b) Magnesia
  • c) Alumina
  • d) Silica
Q.15
_____________ is a flux used in iron smelting.
  • a) Silica
  • b) Caesium
  • c) Dolomite
  • d) Mica
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