Acetylene Gas Purifier & Hydraulic back pressure valve
33. Acetylene gas contains
A. calcium, carbon and hydrogen   
B. calcium and hydrogen   
C. calcium, carbon, hydrogen and oxygen
D. carbon and hydrogen

34. In an acetylene purifier the sulphureted and phosphorated hydrogen are removed by…
A. pumice   
B. water   
C. filter wool    
D. purifying chemicals

35.A hydraulic back pressure valve is used to…
A. increase the pressure of oxygen gas  
B. increase the pressure of acetylene gas
C. prevent the danger of back fire  
D. decrease the pressure of oxygen

36. The nozzle size required to weld a M.S pipe elbow joint with 3WT to get full depth fusion and good penetration is…
A. 5  
B. 7   
C. 10   
D. 13

37. The selection of nozzle for pipe welding depends upon…
A. groove angle   
B. welding position   
C. pipe wall thickness   
D. diameter of pipe

38. One of the functions of flux in gas welding is…
A. dissolve the metal oxides   
B. reduce the melting point of mental  
C. increase the flame temperature
D. increase the root penetration

39. The angle of vee groove of a single vee but joint for cast iron welding is…
A. 60◦     
B. 70◦    
C. 80◦    
D. 90◦

40. On which of the following factors, the choice of flux for gas welding depend?
A. type of material to be joined   
B. type of edge penetration  
C. type of fuel gas 
D. type of flame used

Share by: