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Q#1 DC Machines GATE EE 2001 NAT +2 marks -0 marks

A dc series motor is rated 230V, 1000 rpm, 80 A (refer to figure), the series field resistance is 0.11Ω, and the armature resistance is 0.14Ω.  If the flux at an armature current of 20A is 0.4 times of that under rated condition, calculate the speed at this reduced armature current of 20A.

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EMFT EE 9 0 0
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General Aptitude 206 0 0