Which of following constitute short-circuit in the armature winding Insulation failure between two commutator bars Insulation failure between two turns of a coil Two of more turns of the same coil getting grounded All of these Correct answer: 4. All of these Visit Electrical Engineering MCQ here for more
To evade formation of grooves in the commutator of a machine, what should be done Brush position has no effect on the commutator grooving The brushes of opposite polarity should track each other The brushes of same polarity should track each other All of above Correct answer: 2. The brushes of opposite polarity should track … Read more
The type of generator that will be in a position to build up without any residual magnetism in the poles Compound generator Self-excited generator Series generator Shunt generator Correct answer: 2. Self-excited generator Visit Electrical Engineering MCQ here for more
Number of armature parallel paths in a two-pole generator having duplex lap winding is 2 4 6 8 Correct answer: 2. 4 Visit Electrical Engineering MCQ here for more
Copper brushes in machines are used In both of the above cases Where high voltage and small currents are involved Where low voltage and high currents are involved None of above Correct answer: 3. Where low voltage and high currents are involved Visit Electrical Engineering MCQ here for more
In case of DC generators, brushes on commutator remain in contact with conductors which Are farthest from the poles Lie under interpolar region Lie under North Pole Lie under South Pole Correct answer: 2. Lie under interpolar region Visit Electrical Engineering MCQ here for more
number of brushes in a commutator depends on which of following factor Amount of current to be collected Speed of armature Type of winding Voltage Correct answer: 1. Amount of current to be collected Visit Electrical Engineering MCQ here for more
The vital condition for parallel operation of two generators is that they have Same kW rating Same percentage regulation The same drooping voltage characteristics The same operation RPM Correct answer: 3. The same drooping voltage characteristics Visit Electrical Engineering MCQ here for more
While applying Fleming’s right-hand rule to and direction of induced EMF, the thumb points towards Direction of flux Direction of induced EMF Direction of motion of conductor, if forefinger points along the lines of flux Direction of motion of the conductor if forefinger points in the direction of generated EMF Correct answer: 3. Direction of … Read more
When two generators are running in parallel an equalizer bar is employed So that the two identical machines will pass approximately equal currents to the load To increase the generated EMF. To increase the series flux To reduce the combined effect of armature reaction of both the machines Correct answer: 1. So that the two … Read more