76. Two streams of liquid metal which are not hot enough to fuse properly result into a casting defect known -as

1. 1. cold shut

   
   
   

   2. swell

   
   
   

   3. sand wash

   
   
   

   4. scab

   
   
   

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   NA

   Correct Option: B

   NA

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77. Misrun is a casting defect which occurs due to

1. 1. very high pouring temperature of the metal

   
   
   

   2. insufficient fluidity of the molten metal

   
   
   

   3. absorption of gases by the liquid metal

   
   
   

   4. improper alignment of the mould flasks

   
   
   

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   NA

   Correct Option: B

   NA

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78. Which of the following casting processes uses expandable pattern and expandable mould?

1. 1. Shell mould casting

   
   
   

   2. Investment casting

   
   
   

   3. Pressure die casting

   
   
   

   4. Centrifugal casting

   
   
   

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   NA

   Correct Option: A

   NA

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79. In sand casting fluidly of the molten metal increases with

1. 1. Increase in degree of superheat

   
   
   

   2. Decrease in pouring rate

   
   
   

   3. Increase in thermal conductivity of the mould

   
   
   

   4. Increase in sand grain size

   
   
   

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   NA

   Correct Option: D

   NA

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80. Hot chamber die casting is not suited for

1. 1. Lead and its alloys

   
   
   

   2. Zinc and its alloys

   
   
   

   3. Tin and it's alloys

   
   
   

   4. Aluminum and its alloys

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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