Unconventional Machining Processes Mid - I, September - 2014

1.________ is/are the disadvantage/s of non conventional machining
  • High cost
  • complex set up
  • skilled operator required
  • all the above
Answer: D
2.Very hard materials can be machined with the help of
  • conventional machining
  • unconventional machining
  • both a &b
  • none
Answer: B
3.In _________machining process there is direct contact of tool and work piece, so there is more wear
  • conventional machining
  • unconventional machining
  • both a &b
  • none
Answer: A
4._____________method is unsuitable for machining of electrically non conducting materials
  • USM
  • ECM
  • AJM
  • none
Answer: B
5.Which method is excellent for making precision through cavities in work piece
  • USM
  • ECM
  • AJM
  • AWJM
Answer: A
6._________is used as a energy source in electro chemical machining
  • high current
  • low current
  • abrasives
  • none
Answer: A
7.In non traditional process tool material must be _________than work piece material
  • harder
  • softer
  • medium
  • none
Answer: B
8.The machining rate in ultra sonic machining is high in case of the following
  • brittle
  • ductile
  • a & b
  • none
Answer: A
9.In AJM abrasive jet consists of _________
  • Compressed air & abrasives
  • compressed water & abrasives
  • due to hammering action abrasives
  • none
Answer: A
10.In ECM ,material removal of metal takes place by
  • abrasives
  • dissolution of metal from job
  • Compressed air & abrasives
  • none
Answer: B
11.In AJM the distance between workpiece and nozzle is kept about ________________
Answer: 1 to 0.7 mm
12.Mixing ratio is defined as _________________
Answer: volume flow rate of abrasive particles / volume flow rate of carrier gas
13.SOD means ________________
Answer: The distance between nozzle surface to work surface
14.In AWJM mixing process takes place in__________________
Answer: Mixing chamber
15.During USM the metal removal is achieved by ___________________
Answer: Hamering action of abrasive particles
16.Abrasive slurry is the mixture of ____________________
Answer: Abrasive grains & water
17.ECM process is working on _________________ principle.
Answer: Faraday’s First Law
18.The device used for converting any type of energy into ultrasonic waves or vibration is Called __________________
Answer: Ultrasonic transducer
19.ECM process is best suited for _____________________
Answer: Hard materials
20.ECM operates on at _______________voltage.
Answer: 2 to 20v