1. . There are --------- valves on a gas cutting torch.
(A) One
(B) Two
(C) Three
(D) Four
2. . The torch handle provides ………
(A) Oxygen
(B) CO₂
(C) Acetylene
(D) a and c
3. . When oxygen and acetylene are in same quantity, flame obtained is ………
(A) Reducing
(B) Neutral
(C) Oxidizing
(D) None
4. . A flame with less oxygen and more acetylene is called as ………
(A) Reducing
(B) Neutral
(C) Oxidizing
(D) None
5. . A flame with more oxygen and less acetylene is called as ………
(A) Reducing
(B) Neutral
(C) Oxidizing
(D) None
6. . For gas cutting ……… flame is used
(A) Neutral
(B) Oxidizing
(C) Carburizing
(D) All
7. . For Aluminium, Copper and Cast Iron welding ……… flame is used
(A) Neutral
(B) Oxidizing
(C) Carburizing
(D) All
8. . In ……… flame, the inner zone consists of a luminous cone that is bluish-white
(A) Neutral
(B) Oxidizing
(C) Carburizing
(D) All
9. . Base metal turns cherry red at approximate temperature ………
(A) 800°C–900°C
(B) 900°C–950°C
(C) 850°C–950°C
(D) None
10. . The temperature at the inner cone tip of a Neutral flame is approximately ………
(A) 5860°F
(B) 5850°F
(C) 5840°F
(D) 5830°F
11. . A ……… is a safety device designed to stop a flame in its tracks
(A) Regulator
(B) Flashback arrestor
(C) Nozzle
(D) None
12. . The temperature of oxidizing flame is approximately ………
(A) 6100°F
(B) 6200°F
(C) 6300°F
(D) 6400°F