Electrical Machines Which motor cannot be started on no load? both B and C cumulative compound motors series motors shunt motors both B and C cumulative compound motors series motors shunt motors 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%. 78.5% 72.5% 67.5% 82.5% 78.5% 72.5% 67.5% 82.5% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will remain unaltered increase by 200% increase by 100% reduced to half remain unaltered increase by 200% increase by 100% reduced to half ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In an ideal DC generator the regulation is zero. low. high. positive. zero. low. high. positive. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to 173 A. 127 A. 240 A. 190 A. 173 A. 127 A. 240 A. 190 A. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Series booster is a separately excited DC generator. shunt wound DC generator. series wound DC generator. permanent magnet DC generator. separately excited DC generator. shunt wound DC generator. series wound DC generator. permanent magnet DC generator. ANSWER DOWNLOAD EXAMIANS APP
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