Electrical Machines In a DC generator sparking between brushes and commutator surface may be due to under commutation. too rapid reversal of current. any of the above. over commutation. under commutation. too rapid reversal of current. any of the above. over commutation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Poles of DC machine are often laminated to reduce armature reaction. reduce pulsation loss. reduce iron weight. dissipate more heat. reduce armature reaction. reduce pulsation loss. reduce iron weight. dissipate more heat. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is 250 W 500 W 300 W 400W 250 W 500 W 300 W 400W ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In salient pole synchronous machine, the reluctance power varies as cos2δ cosδ sinδ sin2δ cos2δ cosδ sinδ sin2δ ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Why are capacitors used with large AC induction motor? Improve current level. Improve voltage level. Improve power level. Improve power factor. Improve current level. Improve voltage level. Improve power level. Improve power factor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The function of field regulator in a DC compound motor is to vary the armature resistance. none of above. limit the armature current. control field current. vary the armature resistance. none of above. limit the armature current. control field current. ANSWER DOWNLOAD EXAMIANS APP
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