Electrical Machines The output voltage of a DC generator is E = V – IaRa. E = V + IaRa. E = V + Ia. E = V + Ra. E = V – IaRa. E = V + IaRa. E = V + Ia. E = V + Ra. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Synchronous condensers are used to All of these improve the power factor reduce hunting improve starting torque All of these improve the power factor reduce hunting improve starting torque ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor Increases. Oscillates around the rated speed. Remains unchanged. Decreases. Increases. Oscillates around the rated speed. Remains unchanged. Decreases. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be 230 V 115 V 460 V 65 V 230 V 115 V 460 V 65 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In the 3-phase induction motor, the resultant flux is of a constant nature and is 1/2 times maximum value of flux due to any phase equal to φm, where φm is the maximum flux due to any phase 3/2 times maximum value of flux due to any phase 3 times maximum value of flux due to any phase 1/2 times maximum value of flux due to any phase equal to φm, where φm is the maximum flux due to any phase 3/2 times maximum value of flux due to any phase 3 times maximum value of flux due to any phase ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A? 11% 41% 21% 10% 11% 41% 21% 10% ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS