Electrical Machines The slip of an induction motor during DC rheostatic braking is 1 - s. s. 2 + s. 2 - s. 1 - s. s. 2 + s. 2 - s. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated) changes to three times the original value remain the same as the original changes to 0.5 times the original value changes to 1.5 times the original value changes to three times the original value remain the same as the original changes to 0.5 times the original value changes to 1.5 times the original value ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is 40 V. 60 V. 20 V. 0 V. 40 V. 60 V. 20 V. 0 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant. 27.73 Nm . 65.8 Nm. 38.5 Nm. 74 Nm. 27.73 Nm . 65.8 Nm. 38.5 Nm. 74 Nm. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Star - delta method of starting of motor is not possible in case of low horse power motor. high speed motor. single phase induction motor. high torque motor. low horse power motor. high speed motor. single phase induction motor. high torque motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V. 222 V. 220 V. 230 V. 225 V. 222 V. 220 V. 230 V. 225 V. ANSWER DOWNLOAD EXAMIANS APP
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