Electrical Machines A simple method of increasing the voltage of a DC generator is to increase the number of turns in field coil. increase the speed of shaft rotation. increase the number of turns in armature coil. increase the source frequency. increase the number of turns in field coil. increase the speed of shaft rotation. increase the number of turns in armature coil. increase the source frequency. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is 1, 2, 5 2, 3, 6 2, 4, 5, 6 3, 4, 5 1, 2, 5 2, 3, 6 2, 4, 5, 6 3, 4, 5 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then lap-wound machine will have more rated voltage and more current lap-wound machine will have more rated voltage and less current wave-wound machine will have more rated current and more voltage wave-wound machine will have more rated voltage and less current lap-wound machine will have more rated voltage and more current lap-wound machine will have more rated voltage and less current wave-wound machine will have more rated current and more voltage wave-wound machine will have more rated voltage and less current ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Hunting in a synchronous cannot be due to variable frequency. windage friction. variable load. variable supply voltage. variable frequency. windage friction. variable load. variable supply voltage. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Counter emf of a DC motor exceeds supply voltage aids applied voltage. regulates its armature voltage. helps in energy conversion. exceeds supply voltage aids applied voltage. regulates its armature voltage. helps in energy conversion. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is power factor of a 3 - φ induction motor at no load? Equal to 1. High. Low. Same as full load. Equal to 1. High. Low. Same as full load. ANSWER DOWNLOAD EXAMIANS APP
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