Question

Consider the following statements about non-conventional machining processes: 
i. Hard materials can be easily machined without being damaged 
ii. Complex shapes are easily produced 
iii. They have low specific energy consumption 
iv. Tools need not be harder than work piece

• A. i, ii and iii only
• B. i, ii and iv only
• C. i, iii and iv only
• D. ii, iii and iv only

Hint:

Understanding the principles of non-conventional machining helps in selecting the appropriate method for specific material and shape requirements.

Answer 1

The Correct Option is B

Evaluating the accuracy of the statements.
Statement i: True, non-conventional processes like EDM (Electrical Discharge Machining) can machine hard materials without physical contact, thus without damage. 
Statement ii: True, processes like EDM and waterjet can produce complex shapes. 
Statement iii: False, non-conventional machining processes generally have higher specific energy consumption compared to conventional processes due to their mechanisms like electrical or chemical energy use. 
Statement iv: True, in processes like EDM, the tool does not need to be harder than the workpiece as it does not apply direct force.