Electric Arc Welding & Thermit welding
57. The thermit mixture used in thermit welding can be ignited with an initial temperature of..
A. 1500◦C   
B. 1200◦C  
C. 1000◦C   
D. 500◦C

58. Shielded metal arc welding is classified under the process of…
A. electric resistance welding   
B. special welding   
C. electric arc welding   
D. electro gas welding

59. How to specify the size of an electrode holder?
A. by its weight   
B. by its shape   
C. by its current carrying capacity   
D. by the metal used for making it

60. The current set for a 3.15mm medium coated mild steel electrode is…
A. 50 to 80 amp    
B. 90 to 120 amp   
C. 120 to 150 amp   
D. 150 to 170 amp

61. Which method of cleaning you will use to remove oil, grease and paint from the surface of the metals to be welded?
A. filing    
B. wire brushing    
C. washing with cold water   
D. using solvents of diluted hydrochloric acid

62. In the electrode coding ER4211, the third digit of the number 4211 indicates….
A. welding current and voltage condition   
B. elongation and impact properties   
C. tensile strength of the joint
D. welding position

63. A long arc is used in…
A. welding with a low hydrogen electrode   
B. horizontal position   
C. plug or slot welding   
D. cast iron welding 

64. If the travel speed of electrode is high, which type of weld defect you will get on a T fillet joint?
A. overlap   
B. slag inclusion   
C. excessive reinforcement   
D. lack of root penetration 

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