GATE Mechanical Engineering: Questions 51 - 54 of 68

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Question number: 51

» Manufacturing and Industrial Engineering » Metal Casting » Solidification and Cooling

Appeared in Year: 2014

Match List-Ⅰ List-Ⅱ▾

Question

Match the following:
List-Ⅰ (Group A) List-Ⅱ (Group B)

(A)

Shrinkage

(i)

Low permeability of the sand mould

(B)

Hot tears

(ii)

Volumetric contraction both in liquid and solid stage

(C)

Cold Shut

(iii)

Differential cooling rate

(D)

Blow holes

(iv)

Improper fusion of two streams of liquid metal

Choices

Choice (4) Response
  • (A)
  • (B)
  • (C)
  • (D)

a.

  • (i)
  • (ii)
  • (iii)
  • (iv)

b.

  • (ii)
  • (iii)
  • (iv)
  • (i)

c.

  • (iv)
  • (iii)
  • (i)
  • (ii)

d.

  • (i)
  • (iv)
  • (ii)
  • (iii)

Question number: 52

» Manufacturing and Industrial Engineering » Metal Casting » Design of Patterns

Appeared in Year: 2014

Short Answer Question▾

Write in Short

An aluminum alloy (density 2600) casting is to be produced. A cylindrical hole of 100 mm diameter and 100 mm length is made in the casting using sand core (density 1600). The net buoyancy force (in Newton) acting on the core is ________

Question number: 53

» Manufacturing and Industrial Engineering » Metal Casting » Solidification and Cooling

Appeared in Year: 2008

MCQ▾

Question

In sand casting of a hollow part of lead, a cylindrical core of diameter 120 mm and height 180 mm is placed inside the mould cavity. The densities of core material and lead are 1600 kg/m 3 and 11, 300 kg/m 3 respectively. The net force (in N) that tends to lift the core during pouring of molten metal will be

Choices

Choice (4) Response

a.

64.5

b.

193.7

c.

257.6

d.

19.7

Question number: 54

» Manufacturing and Industrial Engineering » Metal Casting » Design of Patterns

Appeared in Year: 2010

MCQ▾

Question

During the filling process of a given sand mould cavity by molten metal through a horizontal runner of circular cross section the frictional head loss of the molten metal in the runner will increase with the

Choices

Choice (4) Response

a.

decrease in internal surface roughness of runner

b.

increase in average velocity of molten metal

c.

decrease in length of runner

d.

increase in runner diameter

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