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The cutting tool used in wire-EDM is made of
Which of the above tool is used?
Consider the following statements pertaining to plasma arc cutting:
1. Plasma is a hot ionized gas.
2. Plasma can produce very high temperatures.
3. Plasma arc cutting is used only for electrically conductive metals.
4. Wider kerf is produced.
Which of the above are correct?
Plasma arc cutting produces very narrow kerf and minimum HA
Which of the following gases is used for cleaning the cat in plasma arc cutting?
Water is the main, cutting agent in water jet machining. Other cutting fluid used may be
The average water jet velocity in water jet machining may be
In an electro - chemical machining (E C M ) operation, a square hole of diamensions 5 mm x 5 mm is drilled in a block of copper. The current used is 5000 A. Atomic weight of copper is 63 and valency of dissolution is 1. Faraday’s constant is 96,500 Coulomb. The material removal rate (in g/s) is
Which one of the following process conditions leads .to higher MRR\n ECM process?
A = gram atomic weight of the metallic ions
I = current (amperes)
p = density of the anode (gm/cm3)
Z = valency of the cation
F = Faraday (= 96,500 coulombs)
Material removed by mechanical action in
Material removed by thermal action in
Material removal by mechanical action: AJM, Low-stress grinding, USM Material removed by electrical process: Electrochemical deburring, Electrochemical grinding , Electroch emical milling , Electrochemical polishing.
Material removed by thermal process: Electron-beam machining, Electrical discharge grinding, Laser beam machining, Plasma beam machining.
Material removed by chemical process: ECM, Photochemical maching
A titanium sheet of 5 mm thickness is cut by wire-cut EDM process using a wire of 1 mm diameter. A uniform spark gap of 0.5 mm on both sides of the wire is maintained during cutting operation. If the feed rate of the wire into the sheet is 20 mm/min, the material removal rate (in mm3/min) will be