DC Welding Generator & Nick Break Test
81. The name of the part in a DC welding generator which converts the AC supply voltage into DC welding output voltage is…
A. armature   
B. commutator   
C. field coils    
D. carbon brushes

82. Which one of the following is the reason for poor fusion of bead with the base metal?
A. electrode travel too slow   
B. current too high   
C. current too low   
D. arc too short

83. Which one of the following defects will occurs if the percentage of phosphorus is more in the base metal?
A. slag inclusion   
B. surface crack  
C. lack of fusion   
D. undercut

84. Which method of test you will use to check a surface crack on a mild steel welded joint at a cheaper cost?
A. X-ray test   
B. ultrasonic test   
C. visual inspection   
D. magnetic particle test

85. Which one of the following defects can be tested found by a Nick Break test on T fillet joint?
A. crater cracks   
B. surface cracks   
C. lack of root penetration   
D. insufficient throat thickness

86. Which one of the following metal plates can NOT be joined by projection welding process?
A. tin plates   
B. copper plates   
C. mild steel plates   
D. stainless steel plates

87. In which position of pipe welding, the pipe is fixed and inclined at 45◦ to both horizontal and vertical plane?
A. 1G  
B. 2G   
C. 5G    
D. 6G

88. The current to be set for welding a pipe butt joint with a 2.5mmØ rutile coated M.S electrode is…
A. 50A to 70A   
B. 70A to 80A   
C. 80A to 90A    
D. 90A to 100A

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