Electrical Machines A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be 75 W 112.5 W 168.75 W 50 W 75 W 112.5 W 168.75 W 50 W ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An alternator is feeding an infinite busbar. Its prime mover is suddenly shutdown. The alternator will continue to work as alternator but the direction of rotation will reverse. start working as induction motor. come to stand still. continue to work as synchronous motor with same direction of rotation. continue to work as alternator but the direction of rotation will reverse. start working as induction motor. come to stand still. continue to work as synchronous motor with same direction of rotation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is power factor of a 3 - φ induction motor at no load? High. Low. Same as full load. Equal to 1. High. Low. Same as full load. Equal to 1. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following machine will have maximum efficiency? Electrical power transformer. Induction motor. DC motor. Electrical power generator. Electrical power transformer. Induction motor. DC motor. Electrical power generator. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the reason for stationary armature essential in alternators above 5 KVA? Insulation requirement is less. Operating cost is less. Collecting of large current is simple. All of these Insulation requirement is less. Operating cost is less. Collecting of large current is simple. All of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC generator the emf generated by the armature is maximum when shaft rotation is high. rate of change of flux is maximum. rate of change of flux is minimum. induced voltage is high. shaft rotation is high. rate of change of flux is maximum. rate of change of flux is minimum. induced voltage is high. ANSWER DOWNLOAD EXAMIANS APP
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