Electrical Machines Hysteresis loss is proportional to f3. f1.5. f. f2. f3. f1.5. f. f2. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a synchronous motor hunting can be reduced to minimum possible by designing the motor for adequate synchronizing power. providing damper winding in the rotor pole faces. using a flywheel. any of above methods. designing the motor for adequate synchronizing power. providing damper winding in the rotor pole faces. using a flywheel. any of above methods. ANSWER DOWNLOAD EXAMIANS APP
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 1, 2, 3 and 4 3 only 1, 3 1, 2 and 3 1, 2, 3 and 4 3 only ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC generator sparking between brushes and commutator surface may be due to under commutation. any of the above. over commutation. too rapid reversal of current. under commutation. any of the above. over commutation. too rapid reversal of current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Air core transformer as compared to iron core transformer, has more copper loss. no magnetic core loss. more magnetic core loss. less magnetic core loss. more copper loss. no magnetic core loss. more magnetic core loss. less magnetic core loss. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase machine B any of the two machines none of these machine A machine B any of the two machines none of these machine A ANSWER DOWNLOAD EXAMIANS APP
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