1. . For Copper Welding ……… flame is used.
(A) Oxidizing
(B) Carburizing
(C) Neutral
(D) All
2. . Before welding, edges should be cleaned from ………
(A) Rust
(B) Oxides
(C) Impurities
(D) All
3. . After welding, to make ……… properties better, light striking is done with the help of hammer.
(A) Electrical
(B) Mechanical
(C) Physical
(D) None
4. . Copper is good conductor of electricity therefore ……… is not necessary.
(A) Welding
(B) Preheating
(C) Post heating
(D) All
5. . Place the base metal on the ……… during welding because copper has a good capability to bear the heat.
(A) Nothing
(B) Asbestos
(C) Firebricks
(D) Nothing
6. . For Copper welding a filler rod of ……… gauge should be used.
(A) 13
(B) 14
(C) 15
(D) 16
7. . Copper melting point is ………
(A) 1080ºC
(B) 980ºC
(C) 1180ºC
(D) 1280ºC
8. . The angle between torch nozzle and metal surface should be ………
(A) 80º
(B) 90º
(C) 85º
(D) None