Foundry Metallurgy MCQ Questions and Answers | Metallurgical Engineering Page-6 section-1

51.
For casting a cylindrical aluminum bloom having a length of 1000 mm and diameter of 700 mm. the approximate solidification time (in minutes) estimated using Chvorinov's rule is

A. 45

B. 316

C. 440

D. 620

Answer & Solution Discuss in Board Save for Later

52.
The shrinkage allowance for zinc is . . . . . . . . mm.

A. 17

B. 24

C. 20.8

D. 12.5 - 15

Answer & Solution Discuss in Board Save for Later

53.
Riser is not required for the casting of

A. grey cast iron

B. white cast iron

C. Al- 4% Cu

D. Al-12% Si

Answer & Solution Discuss in Board Save for Later

54.
Assertion 'a': During casting of aluminium, grain refinement can be achieved by addition of certain alloying elements.
Reason 'r': The addition of the alloying elements may result in the formation of deoxidation products or intermetallic compounds which may act as nucleation sites for grain refinement.

A. Both 'a' and 'r' are true, but 'r' is not the reason for 'a'

B. Both 'a' and 'r' are true and 'r' is the reason for 'a'

C. 'a' is true but 'r' is false

D. 'a' is false but 'r' is true

Answer & Solution Discuss in Board Save for Later

55.
In foundary practice, the fluidity of an alloy does not increase with increasing

A. superheat

B. channel size

C. flow velocity

D. heat transfer coefficient

Answer & Solution Discuss in Board Save for Later

56.
Fly wheels, track wheels and gears can be produced by

A. true centrifugal casting

B. semi centrifugal casting

C. centrifuged casting

D. none of the above

Answer & Solution Discuss in Board Save for Later

57.
In a casting, cold shut defect is caused by

A. low pouring temperature

B. melt-mould reaction

C. faulty gating system

D. very low mould permeability

Answer & Solution Discuss in Board Save for Later

58.
For designing a pressurised gating system in sand casting, the gating ratio should be

A. 1 : 0.75 : 0.50

B. 1 : 1 : 1

C. 1 : 2 : 4

D. 1 : 3 : 3

Answer & Solution Discuss in Board Save for Later

59.
. . . . . . . . is the strength of the sand (of mold cavity) above 100°C

A. Hot strength

B. Green strength

C. Dry strength

D. None of these

Answer & Solution Discuss in Board Save for Later

60.
Eutectic Al-Si castings are modified by

A. Na

B. P

C. S

D. none of these

Answer & Solution Discuss in Board Save for Later

Foundry Metallurgy MCQ Questions and Answers | Metallurgical Engineering

51. For casting a cylindrical aluminum bloom having a length of 1000 mm and diameter of 700 mm. the approximate solidification time (in minutes) estimated using Chvorinov's rule is

Answer & Solution

52. The shrinkage allowance for zinc is . . . . . . . . mm.

Answer & Solution

53. Riser is not required for the casting of

Answer & Solution

Answer & Solution

55. In foundary practice, the fluidity of an alloy does not increase with increasing

Answer & Solution

56. Fly wheels, track wheels and gears can be produced by

Answer & Solution

57. In a casting, cold shut defect is caused by

Answer & Solution

58. For designing a pressurised gating system in sand casting, the gating ratio should be

Answer & Solution

59. . . . . . . . . is the strength of the sand (of mold cavity) above 100°C

Answer & Solution

60. Eutectic Al-Si castings are modified by

Answer & Solution

51.
For casting a cylindrical aluminum bloom having a length of 1000 mm and diameter of 700 mm. the approximate solidification time (in minutes) estimated using Chvorinov's rule is

52.
The shrinkage allowance for zinc is . . . . . . . . mm.

53.
Riser is not required for the casting of

55.
In foundary practice, the fluidity of an alloy does not increase with increasing

56.
Fly wheels, track wheels and gears can be produced by

57.
In a casting, cold shut defect is caused by

58.
For designing a pressurised gating system in sand casting, the gating ratio should be

59.
. . . . . . . . is the strength of the sand (of mold cavity) above 100°C

60.
Eutectic Al-Si castings are modified by