Electrical Machines In a DC generator if field winding attains the critical resistance field winding will burn. machine will generate maximum power. the voltage generated will be zero. machine will generate maximum voltage. field winding will burn. machine will generate maximum power. the voltage generated will be zero. machine will generate maximum voltage. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ? 1 and 2 1, 2 and 3 2 alone 1 and 3 1 and 2 1, 2 and 3 2 alone 1 and 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a transformer the magnetic coupling between the primary and secondary winding can be increased by increasing the number of turns. using soft material for winding. using transformer oil of better quality. using the magnetic core of low reluctance. increasing the number of turns. using soft material for winding. using transformer oil of better quality. using the magnetic core of low reluctance. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines DC generator will not build up voltage due to wrong direction of rotation. any one of above. if field resistance is more than critical resistance. if it has lost residual magnetism. due to wrong direction of rotation. any one of above. if field resistance is more than critical resistance. if it has lost residual magnetism. ANSWER DOWNLOAD EXAMIANS APP
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 armature circuit none of above shunt field both A and B armature circuit none of above shunt field ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of 2.5Hz 1.5Hz 51.5Hz 48.5Hz 2.5Hz 1.5Hz 51.5Hz 48.5Hz ANSWER DOWNLOAD EXAMIANS APP
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