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MCQ - Mechanical TNPSC JTO
JTO - 440 - Welder - 440 - Unit IV Arc Welding Power Sources

76)   

For welding aluminium, AC is preferred because:

A.
B.
C.
D.
Answer: B
77)   

For deep penetration on steel, DC with:

A.
B.
C.
D.
Answer: A
78)   

In vertical welding position, DC welding is often chosen for:

A.
B.
C.
D.
Answer: A
79)   

AC welding is generally used for:

A.
B.
C.
D.
Answer: A
80)   

Polarity control in AC welding is:

A.
B.
C.
D.
Answer: A
81)   

AC welding machines have fewer moving parts because:

A.
B.
C.
D.
Answer: A
82)   

DC welding machines with MG sets need:

A.
B.
C.
D.
Answer: A
83)   

Rectifier type DC welders require checking:

A.
B.
C.
D.
Answer: A
84)   

Inverter DC welders are more sensitive to:

A.
B.
C.
D.
Answer: A
85)   

AC welders require less servicing because:

A.
B.
C.
D.
Answer: A
86)   

Arc blow occurs mainly in:

A.
B.
C.
D.
Answer: B
87)   

To reduce arc blow in DC welding:

A.
B.
C.
D.
Answer: A
88)   

Arc blow is less in AC welding because:

A.
B.
C.
D.
Answer: A
89)   

Arc blow can cause:

A.
B.
C.
D.
Answer: A
90)   

Which polarity in DC reduces arc blow?

A.
B.
C.
D.
Answer: A
91)   

AC welding machines are generally:

A.
B.
C.
D.
Answer: A
92)   

DC welding machines offer better:

A.
B.
C.
D.
Answer: A
93)   

Energy efficiency is usually higher in:

A.
B.
C.
D.
Answer: A
94)   

In heavy-duty continuous welding, AC machines are preferred because:

A.
B.
C.
D.
Answer: A
95)   

DC machines for field welding are often powered by:

A.
B.
C.
D.
Answer: A
96)   

For welding rusty or dirty metal, AC welding is:

A.
B.
C.
D.
Answer: A
97)   

For welding thin sheets without burn-through, DC welding with:

A.
B.
C.
D.
Answer: C
98)   

AC welding rods usually have coatings to:

A.
B.
C.
D.
Answer: A
99)   

In DC welding, the heat distribution between electrode and work depends on:

A.
B.
C.
D.
Answer: A
100)   

The choice between AC and DC welding depends on:

A.
B.
C.
D.
Answer: A