MCQ - TNPSC JTO
JTO - 440 - Welder
440 - Unit IV Arc Welding Power Sources
81)
AC welding machines have fewer moving parts because:
A.
B.
C.
D.
82)
DC welding machines with MG sets need:
A.
B.
C.
D.
83)
Rectifier type DC welders require checking:
A.
B.
C.
D.
84)
Inverter DC welders are more sensitive to:
A.
B.
C.
D.
85)
AC welders require less servicing because:
A.
B.
C.
D.
86)
Arc blow occurs mainly in:
A.
B.
C.
D.
87)
To reduce arc blow in DC welding:
A.
B.
C.
D.
88)
Arc blow is less in AC welding because:
A.
B.
C.
D.
89)
Arc blow can cause:
A.
B.
C.
D.
90)
Which polarity in DC reduces arc blow?
A.
B.
C.
D.
91)
AC welding machines are generally:
A.
B.
C.
D.
92)
DC welding machines offer better:
A.
B.
C.
D.
93)
Energy efficiency is usually higher in:
A.
B.
C.
D.
94)
In heavy-duty continuous welding, AC machines are preferred because:
A.
B.
C.
D.
95)
DC machines for field welding are often powered by:
A.
B.
C.
D.
96)
For welding rusty or dirty metal, AC welding is:
A.
B.
C.
D.