Electrical Machines A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is 460 A. 340 A. 250 A. 570 A. 460 A. 340 A. 250 A. 570 A. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following pairs is/are correct? semi closed slot-----leakage flux is moderate open slot----- leakage flux is less closed slot----- leakage flux is high All of these semi closed slot-----leakage flux is moderate open slot----- leakage flux is less closed slot----- leakage flux is high All of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Unbalance 3 - Φ stator currents cause double frequency currents in the rotor. All of these vibrations. heating of rotor. double frequency currents in the rotor. All of these vibrations. heating of rotor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following is/are not a self starting motor? 1-phase induction motor both 1 and 2 3-phase induction motor None of these 1-phase induction motor both 1 and 2 3-phase induction motor None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is 1, 2, 5 2, 4, 5, 6 3, 4, 5 2, 3, 6 1, 2, 5 2, 4, 5, 6 3, 4, 5 2, 3, 6 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When the rotor of a 3 phase induction motor is blocked then the slip is 0.54. 0.7. 1. 0.3. 0.54. 0.7. 1. 0.3. ANSWER DOWNLOAD EXAMIANS APP
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