Mechanical Engineering - Manufacturing Science - Casting

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Question - 1

Process of pouring molten metal under high pressure into mould is called

  • A permanent mould casting
  • B die casting
  • C investment casting
  • D centrifugal casting

Question - 2

Casting process being expensive, used only where small number of intricate and highly accurate parts are to be manufactured is

  • A die casting
  • B centrifugal casting
  • C investment casting
  • D Any of these

Question - 3

A cube of side a and a solid has diameter d. They are made from same material. The ratio of their solidification time is

  • A a2d2
  • B \(\frac { { d }^{ 2 } }{ { a }^{ 2 } } \)
  • C \(\frac { { a }^{ 2 } }{ { d }^{ 2 } } \)
  • D \(\frac { a }{ d } \)

Question - 4

During cooling, a cubical casting of side 40 mm undergoes 3%, 4% and 5% volume shrinkage during liquid state, phase transition and solid state respectively. The volume compensated from riser is

  • A 2%
  • B 8%
  • C 7%
  • D 12%

Question - 5

If shrinkage allowance are 0.3 mm/mm, then the internal diameter of the pattern is (given, the cross-sectional area of sprue at the base = 1 cm2, in figure actual size of casting is given)

  • A 20.6 mm
  • B 40.6 mm
  • C 20.12 mm
  • D 19.4 mm

Question - 6

Time taken to fill the cavity is

  • A 169.16 s
  • B 180 s
  • C 175 s
  • D 184 s

Question - 7

The area of sprue at the base is 5 cm2. The time taken by sprue to fill the cavity is

  • A 7.31 s
  • B 6.32 s6.78
  • C 6.78 s
  • D 6.9 s

Question - 8

A sprue for avoiding aspiration to deliver liquid iron at a rate of 20 kg/so The density of iron is 7800 kg/m3. The height of pouring basin is 9 cm and height of sprue is 25 cm. The diameter of sprue base is

  • A 3.55 cm
  • B 4.55 cm
  • C 3.75 cm
  • D 4.75 cm

Question - 9

The sprue is designed as avoid aspiration effect. The ratio of A1 to A2 is

  • A 2.08
  • B 1.58
  • C 2.5
  • D 2.00

Question - 10

Gray cast iron blocks 100 cm x 50 cm x 40 cm are to be cast in sand moulds. Shrinkage allowance pattem making is 1%  The ratio of volumes of pattern to that of casting will be

  • A 1.03
  • B 1.02
  • C 1.10
  • D 1.20
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