GAS WELDING MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS
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GAS WELDING
MULTIPLE CHOICE QUESTIONS
(MCQ) WITH ANSWERS
MCQ increases the level of understanding
and clarity. It tells the practical
applications of various types of gas
welding. There are three types of
flames in gas welding. These are Neutral,
Carburizing and Oxidizing flames. Each
flame has a different purpose. The most
common gas welding is Oxy-acetylene gas
welding.
Fig. Gas Welding Set-up
Fig. Neutral Flame
Fig. Carburizing Flame
Fig. Oxidizing Flame
Fig. Gas Butt Welding
1. The gases used in gas welding are
(a) Acetylene and Oxygen
(b) Nitrogen and oxygen
(c) Both (a) and (b)
(d) None
ANS: (a)
2. Reason for using acetylene is
(a) Produces high temperature and high pressure
(b) High temperature
(c) High pressure
(d) None
ANS: (b
3. Types of gas welding are
(a) Oxy-Acetylene, Oxy-Gasoline & MAPP Gas Welding
(b) Butane/Propane & hydrogen Welding
(c) Both (a) & (b)
(d) None
ANS: (c)
4. Disadvantages of Oxy-Acetylene welding are
(a) Expensive and highly unstable
(b) Easy to handle
(c) Produces highest temperature
(d) None
ANS: (a)
5. The advantages of Oxy-gasoline welding over Oxy-Acetylene welding are
(a) Cheaper and more effective
(b) More costly
(c) Both (a) & (b)
(d) None
ANS: (a)
6. The advantages of Methylacetylene-Propadiene-petrolium (MAPP) over other methods of gas welding are
(a) Cutting at low pressures
(b) Cheaper
(c) Both (a) & (b)
(d) None
ANS: (d)
7. The advantages of methylacetylene (propyne), propadiene and propane (MAPP) over other methods of gas welding are
(e) Cutting at High pressures
(f) Most inert gas
(g) Both (a) & (b)
(h) None
ANS: (c)
8. The advantages of Butane/propane over other methods of gas welding are
(a) Most inert &produces highest temperature
(b) Cheaper & easy to transport
(c) Both (a) & (b)
(d) None
ANS: (b)
9. Hydrogen welding is used at
(a) Low pressure underwater welding
(b) High pressure under water welding
(c) Both (a) & (b)
(d) None
ANS: (b)
10. MAPP gas welding used for
(a) Welding of steel
(b) Cutting operations
(c) Both (a) & (b)
(d) None
ANS: (b)
11. All gas welding processes need
(a) No filler material
(b) Filler material
(c) Both (a) & (b)
(d) None
ANS: (b)
12. Oxy-Acetylene welding is used for welding of
(a) High melting point ,materials like Carbon steels
(b) Low melting point materials like Aluminum & lead
(c) Both (a) & (b)
(d) None
ANS: (a)
13. Oxy-Hydrogen welding is used for welding of
(a) High melting point materials like Carbon steels
(b) Low melting point materials like Aluminum & lead
(c) Both (a) & (b)
(d) None
ANS: (b)
14. A neutral flame is produced when Acetylene and Oxygen are in the ratio of
(a) 3:1
(b) 2:1
(c) 1:1
(d) None
ANS: ©
15. The flame zones of a reducing flame are
(a) Short sharp zone & long sharp zone
(b) Short sharp zone & Long faintly luminous
(c) Both (a) & (b)
(d) None
ANS: (b)
16. The purpose of short sharp zone in reducing flame is to
(a) Cut the material
(b) Heat the material
(c) Save from atmospheric oxidation
(d) None
ANS: (b)
17. The purpose of long faintly luminous zone in reducing flame is to
(a) Cut the material
(b) Heat the material
(c) Save from atmospheric oxidation
(d) None
ANS: (c)
18. The types of flames in gas welding are
(a) 6
(b) 4
(c) 3
(d) None
ANS: (c)
19. Different flames in gas welding are
(a) Hydrogen & nitrogen flames
(b) Reducing & Oxidizing flames
(c) Reducing, neutral and oxidizing flames
(d) None
ANS: (c)
20. A carburizing flame is produced when acetylene is
(a) Less than oxygen
(b) More than oxygen
(c) Equal to oxygen
(d) None
ANS: (b)
21. The number of zones in a reducing flame is
(a) 1
(b) 2
(c) 3
(d) None
ANS: (c)
22. The various zones of a reducing flame are
(a) Inner short sharp zone, Intermediate white color zone & bluish outer zone
(b) Hydrogen, nitrogen & oxygen zone
(c) Both (a) & (b)
(d) None
ANS: (a)
23. An oxidizing flame is produced when acetylene is
(a) More than Oxygen
(b) Less than oxygen
(c) Equal to oxygen
(d) None
ANS: (a)
24. The zones of oxidizing flame are
(a) 1
(b) 2
(c) 3
(d) None
ANS: (b)
25. The various zones of an oxidizing flame are
(a) Inner bright white & outer blue zones
(b) Hydrogen & Nitrogen zones
(c) Both (a) & (b)
(d) None
ANS: (a)
26. The use of oxidizing flame is to weld
(a) Carbon steels
(b) Copper alloys-brass, bronze
(c) Both (a) & (b)
(d) None
ANS: (b)
27. A neutral flame is used to weld
(a) Copper and its alloys
(b) Aluminum & its alloys
(c) Carbon steels
(d) None
ANS: (c)
28. A reducing flame is used to weld
(a) High carbon steel
(b) Non-ferrous alloys of Nickel & Monel
(c) Both (a) & (b)
(d) None
ANS: (c)
29. The practical applications of MAPP oxygen gas welding are
(a) Underwater cutting
(b) Soldering & Brazing
(c) Both (a) & (b)
(d) None
ANS: (c)
30. The highest temperature produced in Oxy-Acetylene gas welding is
(a) 28000C
(b) 29500C
(c) 31000C
(d) None
ANS: (c)
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