256. Casting process
     A. Slush casting
     B. Shell moulding
     C. Dry sand moulding
     D. Centrifugal casting
     Product
     1. Turbine blade
     2. Machine tool bed
     3. Cylindrical block
     4. Hollow castings like lamp shades
     5. Rain water pipes
     6. Cast iron shoe brake

1. 1. A – 5, B – 3, C –2, D – 4

   
   
   

   2. A – 4, B –5, C –2, D – 3

   
   
   

   3. A – 4, B – 3, C –2, D – 5

   
   
   

   4. A – 2, B – 5, C –4, D – 3

   
   
   

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1. View Hint View Answer Discuss in Forum

   A – 4, B – 3, C –2, D – 5

   Correct Option: C

   A – 4, B – 3, C –2, D – 5

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257. In a green sand moulding process, uniform ramming leads to

1. 1. less chance of gas porosity

   
   
   

   2. uniform flow of molten into the mould cavity

   
   
   

   3. greater dimensional stability of the casting

   
   
   

   4. less sane expansion type of casting defect

   
   
   

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1. View Hint View Answer Discuss in Forum

   Sand will go to last corners of casting

   Correct Option: B

   Sand will go to last corners of casting

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258. The volume flow rate (in mm³/s) is

1. 1. 0.8 × 10⁵

   
   
   

   2. 1.1 × 10⁵

   
   
   

   3. 1.7 × 10⁵

   
   
   

   4. 2.3 × 10⁵

   
   
   

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1. View Hint View Answer Discuss in Forum

   D = 10mm, hs = 250 mm
   V_s = √2gh_s = √2 × 9.81 × 250 × 10³
   

   As =	π	× 10²
   	4

   
   = 78.53 mm²
   Flowrate = V_s . A_s = 1.39 × 105 mm³/s

   Correct Option: D

   D = 10mm, hs = 250 mm
   V_s = √2gh_s = √2 × 9.81 × 250 × 10³
   

   As =	π	× 10²
   	4

   
   = 78.53 mm²
   Flowrate = V_s . A_s = 1.39 × 105 mm³/s

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259. A casting of size 100 mm × 100 mm × 50 mm is required. Assume volume shrinkage of casting as 2.6%. If the height of the riser is 80 mm and riser volume desired is 4 times the shrinkage in casting, what is the appropriate riser diameter in mm?

1. 1. 14.38

   
   
   

   2. 20.34

   
   
   

   3. 28.76

   
   
   

   4. 57.52

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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260. In a binary system of A and B a liquid of 20% A (80% B) is coexisting with a solid of 70% A(30%B). For an overall composition having 40% A the fraction of solid is

1. 1. 0.40

   
   
   

   2. 0.50

   
   
   

   3. 0.60

   
   
   

   4. 0.75

   
   
   

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1. View Hint View Answer Discuss in Forum

   C_o = 40%
   C_l = 20%
   C_s = 70%
   

   ms =	Co - Cl	=	40 - 20	=	20	= 0.4
   	Cs - Cl		70 - 20		50

   Correct Option: A

   C_o = 40%
   C_l = 20%
   C_s = 70%
   

   ms =	Co - Cl	=	40 - 20	=	20	= 0.4
   	Cs - Cl		70 - 20		50

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