Electrical Machines In Ward-Leonard system, the lower limit of the speed imposed by Armature resistance. None of above. Residual magnetism of the generator. Field resistance. Armature resistance. None of above. Residual magnetism of the generator. Field resistance. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The efficiency of a transformer is mainly dependent on copper losses. dielectric losses. core losses. stray losses. copper losses. dielectric losses. core losses. stray losses. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed? Zero 15.28 Nm 15.6 Nm 16.55 Nm Zero 15.28 Nm 15.6 Nm 16.55 Nm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________. kept constant to certain value. decreased. increased. remains same. kept constant to certain value. decreased. increased. remains same. 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% reduced by 10% reduced by 20% increased by 10% increased by 20% reduced by 10% reduced by 20% increased by 10% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be 230 V somewhat less than 230 V 6 V somewhat more than 230 V 230 V somewhat less than 230 V 6 V somewhat more than 230 V ANSWER DOWNLOAD EXAMIANS APP
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