(Solved): A. \\( 250 \\mathrm{~V} \\) dc motor takes an armature current of \\( 23 \\mathrm{~A} \\) when runn ...

A. \\( 250 \\mathrm{~V} \\) dc motor takes an armature current of \\( 23 \\mathrm{~A} \\) when running at 1040 r.p.m. The armature resistance is \\( 0.1 \\Omega \\). Determine the no-load speed, assuming negligible losses. the no-load speed is Round your answer to the nearest integer. r.p.m. Score: \\( 0 / 3 \\) Unanswered b) A. \\( 215 \\mathrm{~V}, 10 \\) hp separately excited do motor delivers power to a load at \\( 1140 \\mathrm{rpm} \\). The armature current drawn by the motor is \\( 189 \\mathrm{~A} \\) and the armature resistance of the motor is \\( 0.15 \\Omega \\). If the rotational losses are \\( 550 \\mathrm{~W} \\), what is the value of the load torque? The Load torque is Found your answer to the nearest integer. N.m. Score: \\( 0 / 4 \\) Unanswered c) A. \\( 370 \\mathrm{~V} \\) separately excited DC motor runs at its normal speed of \\( 950 \\mathrm{rpm} \\) when the armature current is \\( 85 \\mathrm{~A} \\). The armature resistance is \\( 0.4 \\Omega \\). Determine the speed when the armature current is \\( 45 \\mathrm{~A} \\) and the field is reduced to \$70$ of its normal value by increasing the resistance of the field circuit. The new speed is Flound your answer to the nearest integer. r.p.m. Score: \\( 0 / 4 \\) Unanswered d) A shunt generator has a field resistance of \\( 62 \\Omega \\). When the generator delivers \\( 5.4 \\mathrm{~kW} \\), the terminal voltage is \\( 125 \\mathrm{~V} \\), while the generated back EMF is \\( 148 \\mathrm{~V} \\). Determine: i) The armature resistance. ii) The generated EMF when the output is \\( 2.1 \\mathrm{~kW} \\) and the terminal voltage is \\( 160 \\mathrm{~V} \\). i) the armature resistance is Round your answer to 3 decimal places. \\( \\Omega \\) ii) the new back EMF is V