engineering recuitment UPMRC JE 2024 Mock Test Electrical Machines DC Motor DC Motor Speed Regulation
A 230-V DC shunt motor has an armature resistance of 0.25 Ω and runs at 1100 rpm, taking an armature current 40 A. It is desired to reduce the speed to 750 rpm. If the armature current remains the same, find the additional resistance to be connected in series with the armature circuit.
1
1 Ω
2
1.5 Ω
3
1.25 Ω
4
1.75 Ω