Electrical Machines A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms. 0.649. 0.573. 0.443. 0.512. 0.649. 0.573. 0.443. 0.512. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following induction motor has the highest starting torque? None of these Squirrel cage induction motor. Slip ring induction motor. Same in both induction motors. None of these Squirrel cage induction motor. Slip ring induction motor. Same in both induction motors. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A generator may loose residual magnetism due to heating. any of these. vibrations. over excitation. heating. any of these. vibrations. over excitation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are 4% and 5% from no load to full load. Consider the governors operating at 50Hz on no load. How will the machine share, if the load is 600 MW? generator 1 gets over load generator 2 gets over load 200 MW and 400MW None of these generator 1 gets over load generator 2 gets over load 200 MW and 400MW None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then I1 = KI2 + Iw. I1 = KI2. I1 = KI2 + Iw + Iμ.ok I1 = KI2 + Iμ. I1 = KI2 + Iw. I1 = KI2. I1 = KI2 + Iw + Iμ.ok I1 = KI2 + Iμ. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases? Remain unchanged Decreases. Increases. None of above. Remain unchanged Decreases. Increases. None of above. ANSWER DOWNLOAD EXAMIANS APP
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