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    The voltage-current characteristics of a DC generator for arc welding is a straight line between an open circuit voltage of 80 V and short-circuit current of 300 A. The generator settings for maximum arc power will be:

    A) 80 V and 150 A 

    B) 40 V and 300 A

    C) 40 V and 150 V 

    D) V and 300 A

    Correct Answer: C

    Solution :

    \[V={{V}_{0}}\left( 1-\frac{I}{{{I}_{s}}} \right)=80\left( 1-\frac{I}{300} \right)\] For V = 40 V 40= \[80\left( 1-\frac{I}{300} \right)\] I = 150 A


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