DC Generators Carbon brushes are used in a dc machine because _______ Carbon is cheap Carbon lubricates and polishes the commutator Contact resistance is decreased None of the listed here Carbon is cheap Carbon lubricates and polishes the commutator Contact resistance is decreased None of the listed here 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 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 increase the speed of primemover check armature insulation resistance ANSWER DOWNLOAD EXAMIANS APP
DC Generators In case of D.C. machine winding, number of commutator segments is equal to Number of armature conductors Number of armature coil sides Number of armature turns Number of armature coils Number of armature conductors Number of armature coil sides Number of armature turns Number of armature coils ANSWER DOWNLOAD EXAMIANS APP
DC Generators The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be 640 V 620 V 580 V 600 V 640 V 620 V 580 V 600 V ANSWER DOWNLOAD EXAMIANS APP
DC Generators The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is 4 8 6 2 4 8 6 2 ANSWER DOWNLOAD EXAMIANS APP
DC Generators The critical resistance of the D.C. generator is the resistance of Field Armature Brushes Load Field Armature Brushes Load ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS