121. Only 4 pairs can be matched Casting process
     A. Investment casting
     B. Die casting
     C. Centrifugal casting
     D. Drop forging
     E. Extrusion
     F. Shell moulding
     Product
     1. Turbine rotors
     2. Turbine blades
     3. Connecting rods
     4. Galvanized iron pipes
     5. Cast iron pipes
     6. Carburetor body

1. 1. A – 4, B – 3, C – 2, D – 5

   
   
   

   2. A – 2, B – 3, C – 2, D – 5

   
   
   

   3. A – 1, B – 3, C – 2, D – 4

   
   
   

   4. A – 2, B – 5, C – 2, D –1

   
   
   

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1. View Hint View Answer Discuss in Forum

   A – 2, B – 3, C – 2, D – 5

   Correct Option: B

   A – 2, B – 3, C – 2, D – 5

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122. Centrifugally casted products have

1. 1. large grain structure with high porosity

   
   
   

   2. fine grain structure with high density

   
   
   

   3. fine grain structure with low density

   
   
   

   4. segregation of slug toward the outer skin of the casting

   
   
   

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1. View Hint View Answer Discuss in Forum

   Due to faster cooling rate of casting

   Correct Option: B

   Due to faster cooling rate of casting

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123. 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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124. 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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125. In a CNC milling operation, the tool has to machine the circular arc from point (20, 20) to (10, 10) at sequence number 5 of the CNC part program. If the center of the arc is at (20,10) and the machine has incremental mode of defining position coordinates, the correct tool path command is

1. 1. N05 G90 G01 X-10 Y-10 R10

   
   
   

   2. N05 G91 G03 X-10 Y-10 R10

   
   
   

   3. N05 G90 G03 X20 Y20 R10

   
   
   

   4. N05 G91 G02 X20 Y20 R10

   
   
   

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1. View Hint View Answer Discuss in Forum

   
   Radius of circle = 10
   Incremental system is used

   Correct Option: B

   
   Radius of circle = 10
   Incremental system is used

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