611. Inter electrode gap in ECG is controlled by
     

1. 1. controlling the pressure of electrolyte flow
      

   
   
   

   2. controlling the applied static load
      

   
   
   

   3. controlling the size of diamond particle in the wheel
      

   
   
   

   4. controlling the texture of the work
      

   
   
   

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   NA

   Correct Option: C

   NA

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612. Selection of electrolyte for ECM is as follows
     

1. 1. non-passivating electrolyte for stock removal and passivating electrolyte for finish control
      

   
   
   

   2. passivating electrolyte for stock removal and non-passivating electrolyte for finish control
      

   
   
   

   3. selection of electrolyte is dependent on current density
      

   
   
   

   4. electrolyte selection is based on tool work electrodes

   
   
   

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   For stock removal, conductive electrolyte called passivating electrolyte is used.

   Correct Option: B

   For stock removal, conductive electrolyte called passivating electrolyte is used.

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613. USM is about the best process for making holes in glass which are comparable in size with thickness of the sheet.

1. 1. False

   
   
   

   2. True

   
   
   

   3. Neither True nor True

   
   
   

   4. A and B

   
   
   

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   USM is used for machining, non– conducting brittle material like glass, ceramics and it takes place through brittle fracture.

   Correct Option: B

   USM is used for machining, non– conducting brittle material like glass, ceramics and it takes place through brittle fracture.

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614. EDM is more efficient process than ECM for producing large non-circular holes

1. 1. False

   
   
   

   2. True

   
   
   

   3. True / False

   
   
   

   4. None of these

   
   
   

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   MRR : ECM > EDM > USM hence ECM is more efficient.

   Correct Option: A

   MRR : ECM > EDM > USM hence ECM is more efficient.

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615. EDM imposes larger forces on tool than ECM

1. 1. True
      

   
   
   

   2. True / False
      

   
   
   

   3. False
      

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   EDM is non–contact type machining while in ECM material removal takes place through ion displacement.

   Correct Option: C

   EDM is non–contact type machining while in ECM material removal takes place through ion displacement.

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