Question

1. Which process is the most suitable one for producing small-diameter holes with a large depth to diameter ratio:
   1. Wire EDM                 
   2. USM              
   3. ECM            
   4. LBM

1. Which of the following description is not correct for injection molding:
   1. it is better to avoid depressions (undercuts) on the inner surfaces
   2. threads are hard to be made
   3. sharp corners should be replaced by round corners
   4. a draft angle should be designed

1. The high temperature of a cutting tool during turning process is mainly because:
   1. shear deformation of the workpiece material
   2. friction of the tool with machined surface
   3. friction of the tool with chips                        
   4. vibration of the machine too
      
      Which one is an important characteristic/advantage of AM processes that is also a source of defects in some finished products?
      1. Cost per unit part
      2. Layer by layer fabrication
      3. Using powders in some processes
      4. Uncontrolled grain growth
         
         

Answer 1

Which process is the most suitable one for producing small-diameter holes with a large depth to diameter ratio:

1. Wire EDM                 

Wire EDM is used to drill small diameter holes

Which of the following description is not correct for injection molding:

1. it is better to avoid depressions (undercuts) on the inner surfaces
2. threads are hard to be made
3. sharp corners should be replaced by round corners
4. a draft angle should be designed

The high temperature of a cutting tool during turning process is mainly because:

1. shear deformation of the workpiece material
2. friction of the tool with machined surface
3. friction of the tool with chips                        
4. vibration of the machine too

Shear deformation is the major cause of heat generation in turning process.

Which one is an important characteristic/advantage of AM processes that is also a source of defects in some finished products?

1. Cost per unit part
2. Layer by layer fabrication
3. Using powders in some processes
4. Uncontrolled grain growth

Powders in AM causes gases to be entrapped

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