Electrical Machines For a given torque, reducing diverter resistance of a DC series motor causes increase in speed demanding more armature current. increase in speed but armature currnet remains the same. decrease in speed demanding less armature current. decrease in speed but armature current remains the same. increase in speed demanding more armature current. increase in speed but armature currnet remains the same. decrease in speed demanding less armature current. decrease in speed but armature current remains the same. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point. 44.47 Amp. 33.33 Amp. 29 Amp. 43 Amp. 44.47 Amp. 33.33 Amp. 29 Amp. 43 Amp. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly 120 V 240 V 140 V 175 V 120 V 240 V 140 V 175 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines No load test of 3-phase induction motor gives which of the following? variable loss constant loss None of these both A and B variable loss constant loss None of these both A and B ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Hunting phenomenon is observed in which motor? Induction motor. Synchronous motor. DC motor. Both A and C. Induction motor. Synchronous motor. DC motor. Both A and C. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following is/are the advantages of carbon brush over the copper brush? They are self lubricating in nature They are not hard as copper brush In case of any sparking they will be less damaged than copper brushes All of these They are self lubricating in nature They are not hard as copper brush In case of any sparking they will be less damaged than copper brushes All of these ANSWER DOWNLOAD EXAMIANS APP
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