Given a PMDC motor with the following specifications, what is the operating efficiency of the motor at a torque of 3.8 Nm? Give your answer in units of percent. Vin = 19 V, nl = 76 rad/s, Kb = 0.31 Vs/rad, Kt = 0.31 Nm / A, iinl = 2.5 A, istall = 58 A, Tstall = 7 Nm Given a PMDC motor with the following specifications, what is the operating efficiency of the motor at a torque of 3.8 Nm? Give your answer in units of percent. Vin = 19 V, nl = 76 rad/s, Kb = 0.31 Vs/rad, Kt = 0.31 Nm / A, iinl = 2.5 A, istall = 58 A, Tstall = 7 Nm