Electrical Machines High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance. both A and B none of above shunt field armature circuit both A and B none of above shunt field armature circuit ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because there was a break in the armature circuit field winding was wrongly connected field system lost residual magnetism field resistance was higher than critical resistance there was a break in the armature circuit field winding was wrongly connected field system lost residual magnetism field resistance was higher than critical resistance ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Sparkless commutation can be achieved by employing compensating winding. inter poles. high resistance carbon brushes. any one or more of the above methods. compensating winding. inter poles. high resistance carbon brushes. any one or more of the above methods. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Two DC generators having equal open-circuit emfs but slight different load characteristics are operating in parallel, then the machine with more drooping characteristic will supply more load. None of these the machine will share load equally. the machine with more drooping characteristic will supply less load. the machine with more drooping characteristic will supply more load. None of these the machine will share load equally. the machine with more drooping characteristic will supply less load. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is 2, 3, 4 1, 2, 5 1, 3, 5 1, 2, 3, 4 2, 3, 4 1, 2, 5 1, 3, 5 1, 2, 3, 4 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following bearings and their uses are correct neither 1 nor 2 ball bearings → small machines both A and B roller bearings → large machines neither 1 nor 2 ball bearings → small machines both A and B roller bearings → large machines ANSWER DOWNLOAD EXAMIANS APP
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