A shunt generator can self-excite if Irrespective of the value of the resistance in the field circuit Resistance of the field circuit is greater than critical value Resistance of the field circuit is less than critical value None of these Correct answer: 3. Resistance of the field circuit is less than critical value Visit Electrical … Read more
the number of brushes in case of lap winding is always Double the number of poles Half the number of poles Same as the number of poles Two Correct answer: 3. Same as the number of poles Visit Electrical Engineering MCQ here for more
The generator can be considered as a Power pump Prime mover Rectifier Rotating amplifier Correct answer: 4. Rotating amplifier Visit Electrical Engineering MCQ here for more
In case of DC machines, the mechanical losses of machines are primary function of Current Speed Voltage None of these Correct answer: 2. Speed Visit Electrical Engineering MCQ here for more
The series field of a short-shunt generator is excited by which of following currents Armature current External current Load current Shunt current Correct answer: 3. Load current Visit Electrical Engineering MCQ here for more
The primary objective of providing dummy coils in a generator is To amplify voltage To enhance flux density To provide mechanical balance for the rotor To reduce eddy current losses Correct answer: 3. To provide mechanical balance for the rotor Visit Electrical Engineering MCQ here for more
If brushes of DC generator are moved in order to bring these brushes in magnetic neutral axis, there will be Cross magnetization as well as magnetization Cross magnetization only Cross-magnetization as well as demagnetizing Demagnetization only Correct answer: 3. Cross-magnetization as well as demagnetizing Visit Electrical Engineering MCQ here for more
The voltage drop for which of the below mentioned types of brush can be expected to be least Carbon brushes Graphite brushes Metal graphite brushes None of these Correct answer: 3. Metal graphite brushes Visit Electrical Engineering MCQ here for more
The incorrect statement regarding generators is Back pitch and front pitch are both odd and approximately equal to the pole pitch Compensating winding in a machine helps in commutation Equalizing bus bars are used with parallel running of shunt generators In a D. C. generator interpoles winding is connected in series with the armature winding … Read more
In generators, current to the external circuit from armature is given through Commutator Slip rings Solid connection None of above Correct answer: 1. Commutator Visit Electrical Engineering MCQ here for more