Electrical Machines If the excitation is increased, the power factor is lagging power factor None of these unity power factor leading power factor lagging power factor None of these unity power factor leading power factor ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as T ∝ √P. T2 ∝ P3. T is independent of P. T ∝ P. T ∝ √P. T2 ∝ P3. T is independent of P. T ∝ P. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When flux density is constant in a transformer, hysteresis loss varies as V² f² f V V² f² f V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines stepped cores are used in transformers in order to reduce iron loss. reluctance of core. volume of copper. volume of iron. iron loss. reluctance of core. volume of copper. volume of iron. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be 48.0%. 88.8%. 57.1%. 59.2%. 48.0%. 88.8%. 57.1%. 59.2%. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The condition for maximum running torque is 0.707 lagging unity 0.5 lagging R = S.X zero 0.707 lagging unity 0.5 lagging R = S.X zero ANSWER DOWNLOAD EXAMIANS APP
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