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Answer Posted / santosh kumar
I think types of switchgears should be define as per two
things.1st Useing of di-electic i.e Air,Vacume,Oil etc.
2nd operational i.e Tharmal, magnatic etc.
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ii) A shunt motor supplied at 230V, runs at 900 rpm when the current is 30A. The resistance of the armature is 0.4 ohms. Calculate the resistance required in series with the armature to reduce the speed to 600 rpm, assuming that the armature current is then 20A. [12]
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