Electrical Machines Commutator in DC generator is used for reduce losses convert AC armature current in to DC collecting of current increase efficiency reduce losses convert AC armature current in to DC collecting of current increase efficiency ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The efficiency of a transformer is mainly dependent on copper losses. stray losses. core losses. dielectric losses. copper losses. stray losses. core losses. dielectric losses. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The ventilating ducts in most of DC machine are radial. radial as well as longitudinal. longitudinal. none of these. radial. radial as well as longitudinal. longitudinal. none of these. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Transformer cooling and insulating oil must be of high viscosity. low resistivity. low BDV. low viscosity. high viscosity. low resistivity. low BDV. low viscosity. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following motor is suitable for frequent starting and stoppings? Capacitor start motor Resistance split phase motor All of these Capacitor start capacitor run motor Capacitor start motor Resistance split phase motor All of these Capacitor start capacitor run motor 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, 2 and 3 1 and 3 1 and 2 2 alone 1, 2 and 3 1 and 3 1 and 2 2 alone ANSWER DOWNLOAD EXAMIANS APP
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