(Solved): The name plate of a separately-excited brushed DC motor shows voltage \( V \) ...

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The name plate of a separately-excited brushed DC motor shows voltage \( V \) in volts dc and current \( I \) in amperes. The motor has its armature resistance \( R_{a} \), back emf constant \( K_{b} \) and torque constant \( K_{T} \). Its performance can be summarised in the following figure Select the FALSE statement among the following choices The no-load speed can be obtained as \( \omega_{0}=\frac{V}{K_{b}} \). The no-load current of the armature is different from zero to account for losses in the machine. The stall armature current is \( I_{r l}=\frac{V}{R_{a}} \). The motor is often designed such that it will deliver maximum efficiency at rated conditions. At the maximum output power, the motor speed is three quarters of the no-load speed, i.e. \( \frac{0.75 \mathrm{~V}}{K_{b}} \).