DC Motors In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be Anywhere between 75% and 90% Around 90% 1 Less than 50% Anywhere between 75% and 90% Around 90% 1 Less than 50% ANSWER DOWNLOAD EXAMIANS APP
DC Motors Carbon brushes are preferable to copper brushes because _____ They reduce armature reaction They reduce sparking They have longer life They have lower resistance They reduce armature reaction They reduce sparking They have longer life They have lower resistance ANSWER DOWNLOAD EXAMIANS APP
DC Motors In dc machines fractional pitch winding is used To reduce the sparking To increase the generated emf To improve cooling To reduce the generated emf To reduce the sparking To increase the generated emf To improve cooling To reduce the generated emf ANSWER DOWNLOAD EXAMIANS APP
DC Motors The mechanical power developed in a dc motor is maximum when back emf is equal to _____ the applied voltage. None of the listed here One-third Half Twice None of the listed here One-third Half Twice ANSWER DOWNLOAD EXAMIANS APP
DC Motors A series motor will over speed when The load is increase Load is removed The armature circuit is opened. The field is opened The load is increase Load is removed The armature circuit is opened. The field is opened ANSWER DOWNLOAD EXAMIANS APP
DC Motors If the terminals of armature of D.C. motor are interchanged, this action will offer following kind of braking Dynamic braking Regenerative None of these Plugging Dynamic braking Regenerative None of these Plugging ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS