Electrical Machines Dynamic braking is employed to brake both 1 and 2 non reversing drive reversing drive None of these both 1 and 2 non reversing drive reversing drive None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg ) 0 Volt. 1500 Volt. 1600 Volt. 2000 Volt. 0 Volt. 1500 Volt. 1600 Volt. 2000 Volt. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The principal of starting of 3 - Φ IM is similar to capacitor run IM. repulsion motor type starting. synchronous motor. transformer with short-circuited secondary. capacitor run IM. repulsion motor type starting. synchronous motor. transformer with short-circuited secondary. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is 300 W 400W 500 W 250 W 300 W 400W 500 W 250 W 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%. 72.5% 78.5% 67.5% 82.5% 72.5% 78.5% 67.5% 82.5% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The speed of rotating magnetic field of 8 pole 50 Hz induction motor is 3000 rpm 750 rpm 1000 rpm 1500 rpm 3000 rpm 750 rpm 1000 rpm 1500 rpm ANSWER DOWNLOAD EXAMIANS APP
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