Electrical Machines The magnetic field which initially induces emf in the armature in a self excited DC generator is because of permanent magnets. None of these armature reaction. residual magnetism. permanent magnets. None of these armature reaction. residual magnetism. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is 2400 A. 600 A. 3600 A. 1200 A. 2400 A. 600 A. 3600 A. 1200 A. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Compensating winding are used to rectify the flux density waveform at region under main pole. None of these interpole region. throughout the air gap. region under main pole. None of these interpole region. throughout the air gap. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Resistance commutation is used generally in case of DC machines above 10 kW. DC machines bellow 5 kW. None of these fractional kW DC machines. DC machines above 10 kW. DC machines bellow 5 kW. None of these fractional kW DC machines. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines DC generator will not build up voltage if it has lost residual magnetism. if field resistance is more than critical resistance. due to wrong direction of rotation. any one of above. if it has lost residual magnetism. if field resistance is more than critical resistance. due to wrong direction of rotation. any one of above. ANSWER DOWNLOAD EXAMIANS APP