Multiple Choice Questions (MCQ) on Non traditional machining processes
Multiple Choice Questions (MCQ) on Non traditional machining processes
Which the following is true for Electrical Discharge machining (EDM)?
- The metal removal takes place due to erosion
- Any electrical conductor can be machined by this method.
- Some light oil like transformer oil or kerosene oil is used as dielectric.
- Only i
- i &ii
- i,ii & iii
- ii & iii
(Ans:c)
In Electrical discharge machining (EDM), the spark gap is kept between ___mm to___mm.
- 5 to 5
- 05, 0.5
- 005, 0.05
- 0005, 0.005
(Ans:c)
In Electrical discharge machining, the temperature developed is of the order of
- 2,000°C
- 6,000°C
- 10,000°C
- 14,000°C
(Ans:c)
Which of the following is not true in case of Electrical discharge machining (EDM)?
- Erosion takes place both on Work piece and the tool.
- Gap between tool and work piece is controlled by servo mechanism.
- The electrode (tool) is made of graphite or copper.
- The size of impression on work piece is exactly the same as that on electrode (tool).
(Ans:d)
The Electrical Discharge machining (EDM) process is
- Burr free
- Not for hard metals
- Direct contact machining
- Capable of producing sharp corners
(Ans:a)
In Electron beam machining, workpiece is held in
- vacuum chamber
- dielectric medium
- electrolyte
- none of these
(Ans:a)
In Electron beam machining, as the electrons strikes the work piece
- Their kinetic energy is converted into heat
- They get scattered
- Mechanical erosion in work piece takes place
- Electro-chemical etching takes place
(Ans:a)
The vacuum in case of Electron Beam machining is of the order of
- 10-2 mm of mercury
- 10-5 mm of mercury
- 10-7 mm of mercury
- 10-9 mm of mercury
(Ans:b)
The cathode filament is heated to a temperature of ______ in case of Electron beam machining
- 1200°C
- 1700°C
- 2000°C
- 2500°C
(Ans:d)
In Electron beam machining, the order in which electrons passed after emitted by filament cathode
- diaphragm – anode –focusing lens – Deflector coil
- anode – diaphragm – focusing lens – Deflector coil
- focusing lens – anode – diaphragm –Deflector coil
- Deflector – coil anode – diaphragm – focusing lens
(Ans:b)