Electrical Machines The demagnetising component of armature reaction in a DC generator reduces inter poles flux density. increases armature speed. results in sparking trouble. reduces generator emf. reduces inter poles flux density. increases armature speed. results in sparking trouble. reduces generator emf. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Transformer cooling and insulating oil must be of high viscosity. low resistivity. low viscosity. low BDV. high viscosity. low resistivity. low viscosity. low BDV. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which single phase motor is used for a refrigerator? Repulsion. Split phase. Universal. Capacitor run. Repulsion. Split phase. Universal. Capacitor run. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The current drawn by the armature of DC motor is directly proportional to None of above. The speed of motor. The voltage across the terminals. The torque required. None of above. The speed of motor. The voltage across the terminals. The torque required. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is (Pi/Pc)2 √(Pi/Pc) Pi/Pc Pc/Pi (Pi/Pc)2 √(Pi/Pc) Pi/Pc Pc/Pi ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ? 1 and 2 1 and 3 2 alone 1, 2 and 3 1 and 2 1 and 3 2 alone 1, 2 and 3 ANSWER DOWNLOAD EXAMIANS APP
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