GATE MT Foundry Technology - Askmemetallurgy

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Asked: February 25, 2022In: Foundry Technology (Metal Casting)

GATE MT 2022 Q18. In continuous casting of steel, mould flux is used for _______.

Poll Results

47.83% (A) lubrication ( 11 voters )

30.43% (B) reducing heat loss ( 7 voters )

8.7%(C) inclusion control ( 2 voters )

13.04% (D) reducing solidification shrinkage ( 3 voters )

Based On 23 Votes

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Askmemetallurgy Official

Asked: February 25, 2022In: Foundry Technology (Metal Casting)

GATE MT 2022 Q12. In green sand moulding, the casting defect resulting from the displacement of mould cavity by an oversized core is known as

Poll Results

25% (A) Crush ( 2 voters )

12.5% (B) Hot tear ( 1 voter )

12.5% (C) Blow ( 1 voter )

50% (D) Fin ( 4 voters )

Based On 8 Votes

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Askmemetallurgy Official

Asked: March 31, 2021In: Foundry Technology (Metal Casting)

GATE MT 2021 Q41. Liquid iron is cast into a spherical sand mold (6 cm radius) and a cubical sand mold (12 cm edge length). If solidification time is 60 minutes in the spherical casting, the time (in minutes) required to solidify in the cubical casting is: (round off to nearest integer).

Askmemetallurgy Official

Asked: March 6, 2021In: Foundry Technology (Metal Casting)

GATE MT 2021 Q5. Singles crystal turbine blades of nickel-based superalloys for aero-engines are manufactured using:

Poll Results

23.96%(A) Investment casting ( 46 voters )

7.29%(B) Die casting ( 14 voters )

4.69%(C) Squeeze casting ( 9 voters )

64.06%(D) Directional solidification ( 123 voters )

Based On 192 Votes

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Askmemetallurgy Official

Asked: July 5, 2020In: Foundry Technology (Metal Casting)

GATE MT 2017 Q45.

Total time for solidification of a cubic casting of dimensions 5.0 cm×5.0 cm ×5.0cm is 1.6 min. A cylindrical riser with diameter to height ratio 0.5 is required so that the time for solidification of riser is 3.2 min. Applying ...Read more

Total time for solidification of a cubic casting of dimensions 5.0 cm×5.0 cm ×5.0cm is 1.6 min. A cylindrical riser with diameter to height ratio 0.5 is required so that the time for solidification of riser is 3.2 min. Applying Chvorinov’s law, the height of the riser (in cm) is _____ (answer up to two decimal places)

(Assume that exponent (n) in Chvorinov’s equation is 2)

Askmemetallurgy Official

Asked: June 25, 2020In: Foundry Technology (Metal Casting)

GATE MT 2018 Q44

As shown in schematic below, an alloy is cast as a rectangular slab between two thick mould walls that differ in their thermal conductivities. Shrinkage defects are found at a distance L1 from Mould-1 with thermal conductivity 𝑘1 and distance ...Read more

As shown in schematic below, an alloy is cast as a rectangular slab between two thick mould walls that differ in their thermal conductivities. Shrinkage defects are found at a distance L1 from Mould-1 with thermal conductivity 𝑘₁ and distance L2 from Mould-2 with thermal conductivity 𝑘₂. If the ratio L1:L2 = 3:2, and assuming 1-D heat transfer, the ratio (k1 ⁄𝑘2) is ________ (to two decimal places).

Askmemetallurgy Official

Asked: June 20, 2020In: Foundry Technology (Metal Casting)

GATE MT 2018 Q17. Arrange the following processes in INCREASING magnitude of surface roughness of the casting. P.Investment casting Q.Permanent mould casting R.Pressure die casting S.Sand casting

Poll Results

7.14%(A) R < S < Q < P ( 4 voters )

16.07%(B) P < S < Q < R ( 9 voters )

64.29%(C) R < P < Q < S ( 36 voters )

12.5%(D) Q < P < R < S ( 7 voters )

Based On 56 Votes

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Askmemetallurgy Official

Asked: June 15, 2020In: Foundry Technology (Metal Casting)

GATE MT 2019 Q43

In sand-mold casting of a metal, it takes 180 seconds for complete solidification of a 27 cm3 cube-shaped casting. All other parameters remaining constant, the total solidification time (in seconds, rounded off to one decimal place) for a cylinder-shaped [radius ...Read more

In sand-mold casting of a metal, it takes 180 seconds for complete solidification of a 27 cm³ cube-shaped casting. All other parameters remaining constant, the total solidification time (in seconds, rounded off to one decimal place) for a cylinder-shaped [radius = 1 cm and height = 6 cm] casting of the same metal, is _______.

Askmemetallurgy Official

Asked: May 8, 2020In: Foundry Technology (Metal Casting)

GATE MT 2020 Q19. In a top gated mold, liquid metal enters the mold cavity as a freely falling stream under gravity from a height of 0.5 m. Ignore the fluid friction due to viscosity and the drag due to change in the direction of flow. If the volume of the mold cavity is 10m^3, then the time required to fill the mold is ________s (round off to nearest integer). Given : 1. Acceleration due to gravity is 9.8 ms^-2 2.Cross – sectional area of gate is 0.2 m^2.

Askmemetallurgy Official

Asked: May 6, 2020In: Foundry Technology (Metal Casting)

GATE MT 2020 Q7. Cupola is a furnace used to produce:

Poll Results

7.69%Copper alloys ( 10 voters )

85.38%Cast irons ( 111 voters )

2.31% Aluminium alloys ( 3 voters )

4.62%Plain carbon steels ( 6 voters )

Based On 130 Votes

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Askmemetallurgy Official

Asked: May 6, 2020In: Foundry Technology (Metal Casting)

GATE MT 2020 Q2. In green sand casting, which one of the following is NOT a part of the gating system?

Poll Results

9.04%Runner ( 15 voters )

13.25%Sprue ( 22 voters )

50.6%Riser ( 84 voters )

27.11%Pouring basin ( 45 voters )

Based On 166 Votes

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Askmemetallurgy Official

Asked: April 11, 2020In: Foundry Technology (Metal Casting)

GATE MT 2016 Q.53 For casting a cylindrical aluminum bloom having a length of 1000 mm and diameter of 750 mm, the approximate solidification time (in minutes) estimated using Chvorinov’s rule is ______. [The mould constant is 2 s/mm2]

Poll Results

3.85%(A) 45 ( 1 voter )

26.92%(B) 316 ( 7 voters )

26.92%(C) 440 ( 7 voters )

42.31%(D) 620 ( 11 voters )

Based On 26 Votes

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Askmemetallurgy Official

Asked: April 11, 2020In: Foundry Technology (Metal Casting)

GATE MT 2016 Q.52 In a sand-mould, a sprue of 0.25 m height and a top cross-section area of 2.2 m2 is provided to maintain the melt flow rate at 4 m3.s-1. To prevent aspiration of molten metal, the maximum cross-section area (in m2) at the base of the sprue is ______.

Askmemetallurgy Official

Asked: April 10, 2020In: Foundry Technology (Metal Casting)

GATE MT 2016 Q.38 Mould heat flux (qm) for billet casters is expressed (in SI unit) as a function of distance below the meniscus (z). If mould length (Lm) is 0.8 m and casting speed (Uc) is 0.2 m.s-1, the average mould flux (in MW.m-2) is

GATE MT 2016 Q.38 Mould heat flux (qm) for billet casters is expressed (in SI unit) as a function of distance below the meniscus (z). If mould length (Lm) is 0.8 m and casting speed (Uc) is 0.2 m.s-1, the average mould flux (in MW.m-2) is

Askmemetallurgy Official

Asked: April 9, 2020In: Foundry Technology (Metal Casting)

GATE MT 2016 Q20. The operation NOT associated with casting is

Poll Results

5.71%(A) Gating ( 2 voters )

2.86%(B) Fettling ( 1 voter )

5.71%(C) Stack Moulding ( 2 voters )

85.71%(D) Calendaring ( 30 voters )

Based On 35 Votes

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Askmemetallurgy Official

Asked: April 4, 2020In: Foundry Technology (Metal Casting)

GATE MT 2015 Q58. Match the features observed in castings listed in group 1 with the most appropriate reasons in group 2.

Poll Results

23.81%(A)P-1,Q-3,R-2,S-4 ( 5 voters )

61.9%(B) P-4,Q-1,R-2,S-3 ( 13 voters )

9.52%(C) P-2,Q-1,R-4,S-3 ( 2 voters )

4.76%(D) P-4,Q-1,R-3,S-2 ( 1 voter )

Based On 21 Votes

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GATE MT 2015 Q58. Match the features observed in castings listed in group 1 with the most appropriate reasons in group 2.

Askmemetallurgy Official

Asked: April 4, 2020In: Foundry Technology (Metal Casting)

GATE MT 2015 Q57. At the mould exit of a continuous caster, the metal consisting of a solidified shell with a m=liquid metal core exists at the range of 35 kg s-1. Given that the latent heat of fusion is 3 ×105 J Kg-2 and the total rate of heat removal by the mould is 4.2 × 106 W, the mass fraction of solid at the mould exit is _____. Assume both the solid and liquid remain at the melting point while they are in the mould.

Askmemetallurgy Official

Asked: March 28, 2020In: Foundry Technology (Metal Casting)

GATE MT 2014 Q.40 In a sand casting of a rectangular slab, the thickness of the solidified layer after 2 minutes is known to be 3 cm. Based on Chvorinov’s rule, the solidified thickness (in cm) after 4 minutes is _____.

Askmemetallurgy Official

Asked: March 21, 2020In: Foundry Technology (Metal Casting)

GATE MT 2013 Q20. Risers are NOT required for casting

Poll Results

6.82%(A) stainless steel ( 3 voters )

6.82%(B) plain carbon steel ( 3 voters )

75%(C) grey cast iron ( 33 voters )

11.36%(D) white cast iron ( 5 voters )

Based On 44 Votes

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Askmemetallurgy Official

Asked: March 16, 2020In: Foundry Technology (Metal Casting)

GATE MT 2012 Q24. The riser is designed such that the melt in the riser solidifies

Poll Results

0%(A) Before casting solidifies

18.18%(B) At the same time as casting solidifies ( 6 voters )

75.76%(C) After casting solidifies ( 25 voters )

6.06%(D) Irrespective of the solidification of the casting ( 2 voters )

Based On 33 Votes

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