A balanced three-phase supply is given to a \(30\ \text{kW}\), \(4\)-pole, \(400\ \text{V}\), \(50\ \text{Hz}\), wound rotor induction motor with Y-connected stator and rotor windings. The motor is driving a constant torque load. With shorted sliprings, the machine runs at \(1476\ \text{rpm}\).
When an external non-inductive resistance of \(0.27\ \Omega\) per phase is connected in series in the rotor circuit, the steady-state speed drops to \(1404\ \text{rpm}\).
Neglecting rotational losses, the actual per phase rotor winding resistance is \(\Omega\) (Round off to two decimal places)