Electrical Machines For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio 50% 33.3% 66.3% 57.7% 50% 33.3% 66.3% 57.7% ANSWER DOWNLOAD EXAMIANS APP
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 source frequency. increase the speed of shaft rotation. increase the number of turns in armature coil. increase the number of turns in field coil. increase the source frequency. increase the speed of shaft rotation. increase the number of turns in armature coil. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The magnetic field which initially induces emf in the armature in a self excited DC generator is because of permanent magnets. residual magnetism. armature reaction. None of these permanent magnets. residual magnetism. armature reaction. None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The output power of any electrical motor is taken from the Motor frame. Armature. Coupling mounted on the shaft. Field. Motor frame. Armature. Coupling mounted on the shaft. Field. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction? 750. 100. 200. 500. 750. 100. 200. 500. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Iron losses in a DC machine are independent of variation in speed and voltage. voltage. load. speed. speed and voltage. voltage. load. speed. ANSWER DOWNLOAD EXAMIANS APP
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