railway RRB JE (CBT I + CBT II) Mock Test 2024 Electrical Machines DC Motor DC Motor Types

A 220 V DC shunt motor runs at 630 rpm when the armature current is 50 A. Find the speed if the torque is doubled. Assume armature resistance = 0.2 Ω.

1

315 rpm

2

630 rpm

3

600 rpm

4

157 rpm

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