DC Generators The rapid wear of brushes takes place due to Abrasion from dust Excessive spring pressure Rough commutator bars All of these Abrasion from dust Excessive spring pressure Rough commutator bars All of these ANSWER DOWNLOAD EXAMIANS APP
DC Generators In case of D.C. machine winding, number of commutator segments is equal to Number of armature turns Number of armature coils Number of armature coil sides Number of armature conductors Number of armature turns Number of armature coils Number of armature coil sides Number of armature conductors ANSWER DOWNLOAD EXAMIANS APP
DC Generators The insulating material used between the commutator segments is normally Mica Insulating varnish Paper Graphite Mica Insulating varnish Paper Graphite ANSWER DOWNLOAD EXAMIANS APP
DC Generators The bearings used to support the rotor shafts are generally Magnetic bearings Needle bearings Bush bearings Ball bearings Magnetic bearings Needle bearings Bush bearings Ball bearings ANSWER DOWNLOAD EXAMIANS APP
DC Generators If a self excited D.C. generator after being installed, fails to build up on its first trial run, the first thing to do is to increase the speed of primemover check armature insulation resistance reverse the field connections increase the field resistance increase the speed of primemover check armature insulation resistance reverse the field connections increase the field resistance ANSWER DOWNLOAD EXAMIANS APP
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