Electrical Machines To achieve spark less commutation brushes of DC generator are rocked ahead so as to bring them just ahead of magnetic neutral axis. None of these in magnetic neutral axis. just behind the magnetic neutral axis. just ahead of magnetic neutral axis. None of these in magnetic neutral axis. just behind the magnetic neutral axis. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The speed of a cumulatively compound DC motor can be controlled by varying Armature resistance control. Any of above. Shunt field resistance control. Armature voltage control. Armature resistance control. Any of above. Shunt field resistance control. Armature voltage control. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The effect of ------------------ on main field flux is armature reaction? armature mmf All of these armature flux armature current armature mmf All of these armature flux armature current ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following DC motors has almost constant speed over their full load range? Compound (cummolative). none of these. Series. Shunt. Compound (cummolative). none of these. Series. Shunt. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In escalator which motor is used? 3 - φ IM. 1 - φ IM. Universal motor. DC shunt motor. 3 - φ IM. 1 - φ IM. Universal motor. DC shunt motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings V/2, I/2 and P/4 V, I/2 and P/2 V/2, I and P/2 V, I and P V/2, I/2 and P/4 V, I/2 and P/2 V/2, I and P/2 V, I and P ANSWER DOWNLOAD EXAMIANS APP
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