Soldering & Forge welding

25. Soldering of M.S sheets takes place at a temperature of…
A. 150◦C   
B. 250◦C    
C. 400◦C    
D. 850◦C

26. Forge welding is classified as…
A. fusion welding without pressure   
B. fusion welding with pressure   
C. non-fusion welding without pressure
D. no-fusion welding with pressure

27. The function of a gas regulator is…
A. get different types of flames   
B. mix the gases in the required proportion   
C. change the volume of gas flowing to the blow pipe   
D. set the working pressure

28. For welding a lap fillet joint in vertical position by gas what should be the angle of below pipe to the line of weld?
A. 30◦ to 40◦    
B. 45◦to 50◦    
C. 60◦ to 70◦    
D. 75◦ to 80◦

29. Name the defect, in which the weld metal is flowing on to the surface of the base metal without fusing it
A. crater   
B. overlap  
C. lack of fusion   
D. excessive convexity

30. What should be the angle of blow pipe between the two sheets while welding a T joint on 3.15mm M.S> sheet by gas welding?
A. 30◦   
B. 45◦   
C. 60◦    
D. 80◦

31. Which metal pipe should NOT be used for passing acetylene gas in order to avoid explosions?
A. galvanized iron   
B. stainless steel   
C. mild steel   
D. cooper

32. he percentage of carbon in acetylene gas is…
A. 99%    
B. 92.3%   
C. 89.1%   
D. 85.3%

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