12 A current is drawn from the generator while the engine is idle. In this case, find the number of revolutions of the engine. b) 200 A is drawn from the generator while the motor is working under load. Find the number of revolutions of the engine in this situation. c) Calculate the efficiency with the motor loaded.
One of the same two shunt machines with armature resistance 0.1Ω and shunt (excitation) winding resistances of 120 Ω operates as a generator and is driven by a diesel engine. Shunt machine operating as generator feeds the other shunt machine operating as motor electrically. The generator is with voltage while rotating at 600 rpm. In 600 rpm idle operation, the end voltage of the generator is 280 V, while it supplies 200 A current to the motor, while the end voltage is 240 V.
a) 12 A current is drawn from the generator while the engine is idle. In this case, find the number of revolutions of the engine.
b) 200 A is drawn from the generator while the motor is working under load. Find the number of revolutions of the engine in this situation.
c) Calculate the efficiency with the motor loaded.
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