DC Generators The armature winding of a dc machine is place on the rotor to ______ Facilitate commutation Reduce armature reaction Reduce losses Save iron Facilitate commutation Reduce armature reaction Reduce losses Save iron ANSWER DOWNLOAD EXAMIANS APP
DC Generators When two D.C. series generators are running in parallel, an equalizer bar is used To reduce the combined effect of armature reaction of both machines To increase the speed and hence generated e.m.f. To increase the series flux So that two similar machines will pass approximately equal currents to the load To reduce the combined effect of armature reaction of both machines To increase the speed and hence generated e.m.f. To increase the series flux So that two similar machines will pass approximately equal currents to the load ANSWER DOWNLOAD EXAMIANS APP
DC Generators The bearings used to support the rotor shafts are generally Ball bearings Bush bearings Magnetic bearings Needle bearings Ball bearings Bush bearings Magnetic bearings Needle 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 reverse the field connections check armature insulation resistance increase the field resistance increase the speed of primemover reverse the field connections check armature insulation resistance increase the field resistance increase the speed of primemover ANSWER DOWNLOAD EXAMIANS APP
DC Generators In a commutator Mica is harder than copper Copper is harder than mica Mica and copper are equally hard None of the listed here Mica is harder than copper Copper is harder than mica Mica and copper are equally hard None of the listed here ANSWER DOWNLOAD EXAMIANS APP
DC Generators The size of a dc generator can be reduced by using ______ High resistance winding material Iron commutator Magnetic material of high permeability Lap winding High resistance winding material Iron commutator Magnetic material of high permeability Lap winding ANSWER DOWNLOAD EXAMIANS APP
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