GATE ME 2022 Set 2 — Question 57
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Manufacturing Processes → Joining → Welding Processes
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Question
In a direct current arc welding process, the power source has an open circuit voltage of V and short circuit current of A. Assume a linear relationship between voltage and current. The arc voltage () varies with the arc length () as , where is in volts and is in mm. The maximum available arc power during the process is _________ kVA (in integer).
Correct answer
25 to 25
Solution
1.Determine the linear characteristic of the power source:
Given V and A:
2.Express power () as a function of current ():
3.Find the current for maximum power by differentiating with respect to and setting it to zero:
A
4.Calculate the corresponding voltage ():
V5.Calculate maximum power ():
W = kVA(Note: The arc length relation defines the operating point but the maximum available power from the source is determined by its characteristic curve.)Continue learning with Success Tracker
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