DC Motors In a dc motor, the brushes are shifted from the mechanical neutral plane in a direction opposite to the rotation to _____ Produce flat characteristics Increase speed Decrease speed Reduce sparking Produce flat characteristics Increase speed Decrease speed Reduce sparking ANSWER DOWNLOAD EXAMIANS APP
DC Motors In variable speed motor None of these A weaker commutating field is needed at low speed than at high speed A stronger commutating field is needed at low speed than at high speed Same commutating field is needed at low speed than at high speed None of these A weaker commutating field is needed at low speed than at high speed A stronger commutating field is needed at low speed than at high speed Same commutating field is needed at low speed than at high speed ANSWER DOWNLOAD EXAMIANS APP
DC Motors If a dc motor is comnected across the AC supply it will Burn due to heat produced in the field winding by eddy currents Run at normal speed Not run Run at lower speed Burn due to heat produced in the field winding by eddy currents Run at normal speed Not run Run at lower speed ANSWER DOWNLOAD EXAMIANS APP
DC Motors In the dc motor the iron losses occur in Field Commutator Armature Brushes Field Commutator Armature Brushes ANSWER DOWNLOAD EXAMIANS APP
DC Motors Armature reaction in dc motor is increased When the armature current decreases When the armature current increases When the field current increases By interpoles When the armature current decreases When the armature current increases When the field current increases By interpoles ANSWER DOWNLOAD EXAMIANS APP
DC Motors No load speed of which of the following motor will be highest? Differentially compounded motor Cummulative compounded motor Shunt motor Series motor Differentially compounded motor Cummulative compounded motor Shunt motor Series motor ANSWER DOWNLOAD EXAMIANS APP
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