Discussion
In arc welding, the three elements to be controlled to obtain satisfactory welding operation are:
Answer: A
The three elements are current, voltage and speed of travel.
These are the three variables in the heat input of an arc weld, the energy delivered per unit length of weld:
\[ \text{heat input} = \frac{V \times I}{\text{travel speed}} \]
Too much heat input burns through or distorts the work; too little gives poor fusion. Controlling current, voltage and travel speed controls the weld.
Arc length is not a separate element: the arc voltage rises and falls with the arc length, so the two describe the same variable. Every option that lists arc length alongside voltage, or in place of one of the three, is therefore wrong.
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