MCQ - TNPSC JTO
JTO - 440 - Welder
440 - Unit IV Arc Welding Power Sources
65)
Arc interruptions in AC welding occur
A.
B.
C.
D.
66)
DC welding produces
A.
B.
C.
D.
67)
DC welding allows:
A.
B.
C.
D.
68)
In DC welding, polarity can be:
A.
B.
C.
D.
69)
DC welding is better for:
A.
B.
C.
D.
70)
With DCEP (reverse polarity) in DC welding:
A.
B.
C.
D.
71)
One major disadvantage of DC welding is:
A.
B.
C.
D.
72)
DC welding machines are generally:
A.
B.
C.
D.
73)
Arc blow is more common in:
A.
B.
C.
D.
74)
DC welding requires:
A.
B.
C.
D.
75)
DC machines are less efficient for:
A.
B.
C.
D.
76)
For welding aluminium, AC is preferred because:
A.
B.
C.
D.
77)
For deep penetration on steel, DC with:
A.
B.
C.
D.
78)
In vertical welding position, DC welding is often chosen for:
A.
B.
C.
D.
79)
AC welding is generally used for:
A.
B.
C.
D.
80)
Polarity control in AC welding is:
A.
B.
C.
D.