81. In hollow cylindrical parts made by centrifugal castings, the density of the part is

1. 1. Maximum at the outer region

   
   
   

   2. Maximum at the inner region

   
   
   

   3. Maximum at the mid point between outer and inner surfaces

   
   
   

   4. Uniform throughout

   
   
   

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   NA

   Correct Option: C

   NA

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82. Match the following
    Group-I
    P. Sand casting
    Q. Centrifugal casting
    R. Investment casting
    S. Die casting
    Group-I I
    1. Turbine blades
    2. IC Engine
    3. Large bells
    4. Pulleys

1. 1. P Q R S
      4 1 3 2

   
   
   

   2. P Q R S
      2 4 3 1

   
   
   

   3. P Q R S
      3 4 1 2

   
   
   

   4. P Q R S
      3 2 1 4

   
   
   

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   NA

   Correct Option: D

   NA

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83. Which one of the following is not a property of a sand mould?

1. 1. Permeability

   
   
   

   2. Collapsibility

   
   
   

   3. Strength

   
   
   

   4. Fluidity

   
   
   

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   NA

   Correct Option: D

   NA

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84. Match the following Process
    P. Green sand moulding
    Q. Shell moulding
    R. Investment moulding
    S. Ceramic moulding Mould making technique
    1. Pouring
    2. Dipping
    3. Compaction
    4. Resin bonding
    

1. 1. P – 3, a –4, R –2, S1

   
   
   

   2. P – 4, a –3, R –2, S1

   
   
   

   3. P – 1, a –4, R –2, S3

   
   
   

   4. P – 2, a –4, R –3, S1

   
   
   

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   P – 3, a –4, R –2, S1

   Correct Option: A

   P – 3, a –4, R –2, S1

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85. Shell moulding is an investment casting process (T/F)

1. 1. False

   
   
   

   2. True

   
   
   

   3. NA

   
   
   

   4. NA

   
   
   

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   False

   Correct Option: A

   False

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