1. . Plasma Arc cutting can be used to cut through material thicknesses ranging between ………
(A) 0.4 mm to 170 mm
(B) 0.5 mm to 180 mm
(C) 0.6 mm to 190 mm
(D) None
2. . Plasma cutting is a melting process in which a jet of ionized gas at temperature above ……… is used to melt
(A) 10,000°C
(B) 15,000°C
(C) 20,000°C
(D) 25,000°C
3. . In Plasma Cutting, water is also employed as ……… medium during the cutting process
(A) Primary
(B) Secondary
(C) Intermediate
(D) None
4. . The gas used in plasma cutters can be ………
(A) Oxygen
(B) Nitrogen
(C) Argon
(D) All
5. . In Plasma Cutting, the cooling system cools the ……… assembly components and work piece
(A) Nozzle
(B) Torch
(C) Electrode
(D) None
6. . Plasma cuts any electrically-conductive metal from very thin ………
(A) (<3/8 in.) up to 2 inches
(B) (<2/7 in.) up to 3 inches
(C) Both
(D) None
7. . Plasma cutters generally just need clean ……… air to cut metals
(A) Compressed
(B) Incompressed
(C) Both
(D) None
8. . Water is injected radially into the plasma arc, then the temperature is increased up to ………
(A) 20,000°C
(B) 25,000°C
(C) 30,000°C
(D) 35,000°C
9. . The inert plasma forming gas (argon or nitrogen) can be replaced with air but this requires a special electrode of ………
(A) Hafnium
(B) Zirconium
(C) Chromium
(D) a and b
10. . To improve cut quality and compete with laser systems ……… is used
(A) High Tolerance Plasma Arc Cutting (HTPAC)
(B) Air Plasma
(C) Water Shroud
(D) None