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