Electrical Machines Field weakening control method is used for the _________ ? above rated speed below rated speed both A and B None of these above rated speed below rated speed both A and B None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Two DC generators having equal open-circuit emfs but slight different load characteristics are operating in parallel, then the machine with more drooping characteristic will supply more load. the machine with more drooping characteristic will supply less load. None of these the machine will share load equally. the machine with more drooping characteristic will supply more load. the machine with more drooping characteristic will supply less load. None of these the machine will share load equally. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be none of above. cross-magnetisation. demagnetisation. cross-magnetization as well as demagnetization. none of above. cross-magnetisation. demagnetisation. cross-magnetization as well as demagnetization. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be increased by 20% increased by 10% reduced by 10% reduced by 20% increased by 20% increased by 10% reduced by 10% reduced by 20% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines DC Shunt Motor has disadvantage(s) of none of above. not suitable for rapidly changing loads. less expensive. constant speed. none of above. not suitable for rapidly changing loads. less expensive. constant speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because field winding was wrongly connected field system lost residual magnetism field resistance was higher than critical resistance there was a break in the armature circuit field winding was wrongly connected field system lost residual magnetism field resistance was higher than critical resistance there was a break in the armature circuit ANSWER DOWNLOAD EXAMIANS APP
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