Electrical Machines The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is 25 Hz. 60 Hz. 16.67 Hz. 50 Hz. 25 Hz. 60 Hz. 16.67 Hz. 50 Hz. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Breather is provided in a transformer to absorb moisture from air entering in transformer. absorb moisture of air during breathing. provide cold air in transformer. filter the transformer oil. absorb moisture from air entering in transformer. absorb moisture of air during breathing. provide cold air in transformer. filter the transformer oil. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In shunt dc motor the direction of rotation of the motor will reversed. When either field terminals are reversed or armature terminals are reversed. only field terminals are changed. only armature terminals are reversed. none of above. either field terminals are reversed or armature terminals are reversed. only field terminals are changed. only armature terminals are reversed. none of above. 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. 29 Amp. 44.47 Amp. 33.33 Amp. 43 Amp. 29 Amp. 44.47 Amp. 33.33 Amp. 43 Amp. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a transformer, the frequency of a voltage at the secondary is less than primary. any of the above. greater than the primary. equal to primary. less than primary. any of the above. greater than the primary. equal to primary. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The power factor of an induction motor operating at no load will have a value around 0.9 lag 0.2 lead 0.2 lag unity 0.9 lag 0.2 lead 0.2 lag unity ANSWER DOWNLOAD EXAMIANS APP
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