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 None of these coil resistance. armature emf. reactance voltage induced in the coil. None of these coil resistance. armature emf. reactance voltage induced in the coil. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC generator, the ripples in the direct emf generated are reduced by employing graphite brushes. carbon brushes. equalizer rings. commutator with large number of segments. graphite brushes. carbon brushes. equalizer rings. commutator with large number of segments. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The field system of an alternator is usually excited 250 / 250 V DC. 110 / 220 V AC. 3 - Φ, 50 Hz and 400 V. 230 V AC. 250 / 250 V DC. 110 / 220 V AC. 3 - Φ, 50 Hz and 400 V. 230 V AC. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Rotating magnetic field is produced in an induction motor because of None of these stator winding. rotor winding. either stator winding or rotor winding. None of these stator winding. rotor winding. either stator winding or rotor winding. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease? 5% 40% 19% 10% 5% 40% 19% 10% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Cross magnetization effects which of the following? reduction in main field flux commutation reduces the terminal voltage both 2 and 3 reduction in main field flux commutation reduces the terminal voltage both 2 and 3 ANSWER DOWNLOAD EXAMIANS APP
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