1.The distance between the tip of the electrode and base metal called ?

       a) Arc gap               

       b) Arc length 

       c) Arc distance        

        d) Arc width

2.As the Arc length increase, the operating voltage will ?

     a) Increase     

     b) May increase or decrease

     c) Remain the same 

     d) Decrease 

3. What is straight polarity ?

      a) Electrode negative and job positive connect

      b) Electrode positive  job negative  connect

      c) Ac transformer used the polarity

      d) None of this 

4. What is Reverse polarity ?

       a) Electrode negative and job positive connect

      b) Electrode positive  job negative  connect 

      c) Ac transformer used the polarity

      d) none of this 

          a)  6mm     

          b) 3mm    

          c) 2 mm   

          d) 10 mm