Electrical Machines The speed of a DC series motor is Inversely proportional to the armature current. Proportional to the square of the armature current. Proportional to the armature current. Proportional to field current. Inversely proportional to the armature current. Proportional to the square of the armature current. Proportional to the armature current. Proportional to field current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If field current is decreased in shunt dc motor, the speed of the motor remains same. decreases. increases. None of these remains same. decreases. increases. None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is 0.96 0.87 1.06 0.95 0.96 0.87 1.06 0.95 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature core of a DC machine is laminated to minimise eddy-current loss temperature rise hysteresis loss mechanical loss eddy-current loss temperature rise hysteresis loss mechanical loss ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Armature reaction in DC generators will result in open circuit. increase in slip. short circuit. reduction in generated emf. open circuit. increase in slip. short circuit. reduction in generated emf. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC generator the emf generated by the armature is maximum when induced voltage is high. rate of change of flux is maximum. rate of change of flux is minimum. shaft rotation is high. induced voltage is high. rate of change of flux is maximum. rate of change of flux is minimum. shaft rotation is high. ANSWER DOWNLOAD EXAMIANS APP
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