Electrical Machines Resistance commutation is used generally in case of fractional kW DC machines. DC machines above 10 kW. DC machines bellow 5 kW. None of these fractional kW DC machines. DC machines above 10 kW. DC machines bellow 5 kW. None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Open circuit in a transformer is prefered with rated transformer voltage direct current high frequency supply rated transformer current rated transformer voltage direct current high frequency supply rated transformer current ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In field flux method speed control of DC Motor is constant hp drive below the base speed. constant torque drive above the base speed. constant torque drive below the base speed. constant power drive above base speed. constant hp drive below the base speed. constant torque drive above the base speed. constant torque drive below the base speed. constant power drive above base speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used. Ward Leonard control. any of above method. none of above. rheostatic control. Ward Leonard control. any of above method. none of above. rheostatic control. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The functions of inter poles are nullify reactance voltage and improve the commutation. both 1 and 2 reduce cross magnetization effect and improve commutation None of these nullify reactance voltage and improve the commutation. both 1 and 2 reduce cross magnetization effect and improve commutation None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A. 280 V. 150 V. 240 V. 220 V. 280 V. 150 V. 240 V. 220 V. ANSWER DOWNLOAD EXAMIANS APP
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