2. Questions Bank
  3. Railways
  4. NTPC (Technical Ability)
  5. Fabrication Process

Railways NTPC (Technical Ability) Fabrication Process Question Bank Fabrication Process

  • question_answer
               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 \[V\text{ }=\text{ }40\text{ }V\] \[40=80\left( 1-\frac{I}{300} \right)\] \[I\text{ }=\text{ }150\text{ }A\]


You need to login to perform this action.
You will be redirected in 3 sec spinner