DC Generators Carbon brushes are used in a dc machine because _______ Contact resistance is decreased Carbon lubricates and polishes the commutator None of the listed here Carbon is cheap Contact resistance is decreased Carbon lubricates and polishes the commutator None of the listed here Carbon is cheap ANSWER DOWNLOAD EXAMIANS APP
DC Generators The no load voltage of a generator is 240 V and rated load voltage is 220 V. The voltage regulation of the generator is 9.1% 11.3% 2.8% 4.5% 9.1% 11.3% 2.8% 4.5% ANSWER DOWNLOAD EXAMIANS APP
DC Generators The current in armature conductors of a dc machine is ______ Pure dc Pure dc plus pulsating dc Ac Pulsating dc Pure dc Pure dc plus pulsating dc Ac Pulsating dc ANSWER DOWNLOAD EXAMIANS APP
DC Generators In a wave winding, the commutator pitch is approximately equal to Thrice the pole pitch Twice the pole pitch None of the listed here Pole pitch Thrice the pole pitch Twice the pole pitch None of the listed here Pole pitch ANSWER DOWNLOAD EXAMIANS APP
DC Generators In a D.C. generator the ripples in the direct e.m.f. generated are reduced by Using carbon brushes of superior quality Using commutator with large number of segments Using conductor of annealed copper Using equalizer rings Using carbon brushes of superior quality Using commutator with large number of segments Using conductor of annealed copper Using equalizer rings ANSWER DOWNLOAD EXAMIANS APP
DC Generators The efficiency of a dc generator is maximum when its variable loss is Equal to half of constant loss Equal to Constant loss Equal to double the constant loss None of the listed here Equal to half of constant loss Equal to Constant loss Equal to double the constant loss None of the listed here ANSWER DOWNLOAD EXAMIANS APP
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