Electrical Machines A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is 50 Hz 40 HZ 25 Hz 60 Hz 50 Hz 40 HZ 25 Hz 60 Hz ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The demagnetising component of armature reaction in a DC generator reduces generator emf. increases armature speed. reduces inter poles flux density. results in sparking trouble. reduces generator emf. increases armature speed. reduces inter poles flux density. results in sparking trouble. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will Depends on other factor. Remain unchanged. Reduce by 5%. Increase by 5%. Depends on other factor. Remain unchanged. Reduce by 5%. Increase by 5%. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines To eliminate 5th harmonic in the induced voltage phase breadth should be 72° 36° 18° 30° 72° 36° 18° 30° ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If in DC Shunt Motor the flux is reduced suddenly to zero, then the armature current will reduce. the motor will attain dangerously high speed. the motor will come to stop. the speed of motor will be reduced. the armature current will reduce. the motor will attain dangerously high speed. the motor will come to stop. the speed of motor will be reduced. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Series generators are used in which of the following applications? All of these Used as boosters in dc distribution or transmission. Air crafts. Arc welding. All of these Used as boosters in dc distribution or transmission. Air crafts. Arc welding. ANSWER DOWNLOAD EXAMIANS APP
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