Electrical Machines A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is 9/16. 3/4. 4/3. 16/9. 9/16. 3/4. 4/3. 16/9. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce vibrations. copper loss. hysteresis loss. eddy electric current loss. vibrations. copper loss. hysteresis loss. eddy electric current loss. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The rotor speed of an induction motor is given by Ns = 120f /p × ( 1 - r). Nr = 120f / p × (1-s). Ns = 120f / p × ( 1 - s ). None of these Ns = 120f /p × ( 1 - r). Nr = 120f / p × (1-s). Ns = 120f / p × ( 1 - s ). None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The slight curvature at the lower end of the OCC of a self excited DC generator is due to high speed. magnetic inertia. high field resistance. residual flux. high speed. magnetic inertia. high field resistance. residual flux. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Eb/Vt ratio of a DC motor is an indication of efficiency. starting torque. running torque. speed regulation. efficiency. starting torque. running torque. speed regulation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as air gap. cogging. crawling. relative speed. air gap. cogging. crawling. relative speed. ANSWER DOWNLOAD EXAMIANS APP
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