Electrical Machines During hunting of a synchronous motor field excitation increases. negative phase sequence currents are generated. damper bar develops torque. harmonic are developed in the armature circuit. field excitation increases. negative phase sequence currents are generated. damper bar develops torque. harmonic are developed in the armature circuit. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to reactance voltage induced in the coil. armature emf. None of these coil resistance. reactance voltage induced in the coil. armature emf. None of these coil resistance. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is 2, 3 ,5 2, 3, 4 1, 2, 3 2, 3, 4, 5 2, 3 ,5 2, 3, 4 1, 2, 3 2, 3, 4, 5 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Eb/V ratio of a DC motor is an indication of Starting torque. Running Torque. Speed regulation. Effiency. Starting torque. Running Torque. Speed regulation. Effiency. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The synchronous reactance( Xs) is the combined reactance due to armature reaction and leakage flux reactance due to armature reaction of the machine reactance due to leakage flux reactance either due to armature reaction or leakage flux combined reactance due to armature reaction and leakage flux reactance due to armature reaction of the machine reactance due to leakage flux reactance either due to armature reaction or leakage flux ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a synchronous generator with constant steam input supplies power to an infinite bus at a lagging power factor. If the excitation is increased both power angle and power factor increase power angle increase and power factor decrease power angle decrease and power factor increase both power angle and power factor decrease both power angle and power factor increase power angle increase and power factor decrease power angle decrease and power factor increase both power angle and power factor decrease ANSWER DOWNLOAD EXAMIANS APP
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