411. Pressure die casting deals with casting metals of relatively _____ A ____ melting point and provides _____B. production rate > A. higher/ lower B. higher /lower

1. 1. A – lower B – higher

   
   
   

   2. A – higher B – higher

   
   
   

   3. A – higher B – lower

   
   
   

   4. A – lower B – lower

   
   
   

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   A – lower B – higher

   Correct Option: A

   A – lower B – higher

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412. Ceramics slurry is used in making the moulds for

1. 1. investment casting

   
   
   

   2. die casting

   
   
   

   3. shell mould casting

   
   
   

   4. centrifugal casting

   
   
   

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   investment casting

   Correct Option: A

   investment casting

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413. For casting of turbine blades made of high temperature and high strength alloys, the most suitable process is

1. 1. Die casting

   
   
   

   2. Investment casting

   
   
   

   3. Centrifugal casting

   
   
   

   4. Slush casting

   
   
   

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   Centrifugal casting

   Correct Option: C

   Centrifugal casting

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414. Green strength in powder metallurgy refers to the strength of

1. 1. original material in the bulk form

   
   
   

   2. the powder before compaction

   
   
   

   3. the powder after compaction

   
   
   

   4. the powder after sintering and cooling

   
   
   

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   the powder before compaction

   Correct Option: B

   the powder before compaction

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415. For the same material, powder metallurgy process in superior to casting for

1. 1. making large products

   
   
   

   2. better control over the density of product

   
   
   

   3. better strength of the finished product

   
   
   

   4. making parts with wide variations of thickness at different sections

   
   
   

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   Powder metallurgy reduce porosity

   Correct Option: A

   Powder metallurgy reduce porosity

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