engineering recuitment HPCL Engineer Mock Test 2024 Electrical Machines DC Motor DC Motor Torque

A 230 V DC shunt motor runs at 660 rpm when the armature current is 50 A. Calculate the speed if the torque is doubled. Assume, armature resistance Ra = 0.2 Ω.

1
630 rpm
2
330 rpm
3
690 rpm
4
1320 rpm
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