Electrical Machines A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is 1, 3 1, 2 and 3 3 only 1, 2, 3 and 4 1, 3 1, 2 and 3 3 only 1, 2, 3 and 4 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The constant losses in transformer is/are both 2 and 3. eddy current loss. hysteresis loss. copper loss. both 2 and 3. eddy current loss. hysteresis loss. copper loss. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature of DC machine is made of silicon steel lamination to reduce eddy current loss only. reduce hysteresis loss only. increase the permeability. reduce both eddy current and hysteresis loss. reduce eddy current loss only. reduce hysteresis loss only. increase the permeability. reduce both eddy current and hysteresis loss. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC generator, armature reaction refers to what? Effect of armature flux on the load. None of these Effect of armature flux on the main field flux. Effect of field flux on the armature flux. Effect of armature flux on the load. None of these Effect of armature flux on the main field flux. Effect of field flux on the armature flux. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Open circuit test on transformer gives copper loss eddy current loss hysteresis loss both 1and 2 copper loss eddy current loss hysteresis loss both 1and 2 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant. 74 Nm. 65.8 Nm. 27.73 Nm . 38.5 Nm. 74 Nm. 65.8 Nm. 27.73 Nm . 38.5 Nm. ANSWER DOWNLOAD EXAMIANS APP
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