Electrical Machines Eb/V ratio of a DC motor is an indication of Running Torque. Speed regulation. Effiency. Starting torque. Running Torque. Speed regulation. Effiency. Starting torque. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Crawling in an induction motor is due to slip ring rotor. insufficient starting torque. time harmonics in supply. space harmonics produced by winding currents. slip ring rotor. insufficient starting torque. time harmonics in supply. space harmonics produced by winding currents. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When two DC series motors are connected in parallel, the resultant speed is zero. less than normal speed. more than normal speed. normal speed. zero. less than normal speed. more than normal speed. normal speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%. 82.5% 67.5% 78.5% 72.5% 82.5% 67.5% 78.5% 72.5% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be equal to core loss. more than core loss. zero. less than core loss. equal to core loss. more than core loss. zero. less than core loss. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In an induction motor, the no-load slip is generally equal to zero. less than 1 %. 4 %. 1.5 %. zero. less than 1 %. 4 %. 1.5 %. ANSWER DOWNLOAD EXAMIANS APP
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