Electrical Machines Variation in speed by ward-Leonard control of DC motors occurs due to variation in Armature voltage. Supply voltage. Field excitaion. Armature current. Armature voltage. Supply voltage. Field excitaion. Armature current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively large and thin less and thin less and thick large and thick large and thin less and thin less and thick large and thick ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a dc machine, 1. physically, the brush axis is along the direct axis 2. physically, the brush axis is along the interpolar axis 3. schematically, the brush axis is along the direct axis 4. schematically, the brush axis is along the quadrature axis 5. armaturemmf is directed along the brush axis From these, the correct statements are 1 , 3, 5 2, 3, 5 2, 4, 5 1, 4,5 1 , 3, 5 2, 3, 5 2, 4, 5 1, 4,5 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the back emf in DC motor vanishes suddenly the motor will burn. run at very low speed. run at very high speed. start haunting. burn. run at very low speed. run at very high speed. start haunting. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC machines, the interpoles are provided to counteract demagnetizing effect of armature mmf in commutating zone. both (B) and (C). to make commutation spark less. to counteract the reactance voltage and the cross-magnetizi to counteract demagnetizing effect of armature mmf in commutating zone. both (B) and (C). to make commutation spark less. to counteract the reactance voltage and the cross-magnetizi ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of following DC motors will have percentage increase of input current for the same percentage increase in torque? Series. Cummulative compound. Differntical compound. Shunt. Series. Cummulative compound. Differntical compound. Shunt. ANSWER DOWNLOAD EXAMIANS APP
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