Electrical Machines A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be 6% and -4% 3.2% and -1.6% None of these 4.8% and -3.2% 6% and -4% 3.2% and -1.6% None of these 4.8% and -3.2% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In speed control of DC shunt motor by varying field flux, what may be the value of field regulator? 10 ohm 0.2 ohm 2 ohm. 100 ohm 10 ohm 0.2 ohm 2 ohm. 100 ohm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively? 1600 W and 1250 W 3200 W and 5200 W 1600 W and 5000 W 3200 W and 2500 W 1600 W and 1250 W 3200 W and 5200 W 1600 W and 5000 W 3200 W and 2500 W ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is 16/9. 4/3. 9/16. 3/4. 16/9. 4/3. 9/16. 3/4. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be 8 Ω. 4 Ω. 10 Ω. 2 Ω. 8 Ω. 4 Ω. 10 Ω. 2 Ω. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The synchronous reactance( Xs) is the combined reactance due to armature reaction and leakage flux reactance due to leakage flux reactance due to armature reaction of the machine reactance either due to armature reaction or leakage flux combined reactance due to armature reaction and leakage flux reactance due to leakage flux reactance due to armature reaction of the machine reactance either due to armature reaction or leakage flux ANSWER DOWNLOAD EXAMIANS APP
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