Electrical Machines In synchronous generator, inverted V curve is drawn between field current on Y-axis and armature current on X-axis field current on Y-axis and power factor on X-axis field current on X-axis and armature current on Y-axis field current on X-axis and power factor on Y-axis field current on Y-axis and armature current on X-axis field current on Y-axis and power factor on X-axis field current on X-axis and armature current on Y-axis field current on X-axis and power factor on Y-axis ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The stator core of a 3 - Φ induction motor is laminated in order to reduce the eddy current loss. weight of the stator. both of the above. hysteresis loss. eddy current loss. weight of the stator. both of the above. hysteresis loss. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A single-winding single-phase motor has high starting torque. zero starting torque. starting torque equal to full-load torque. low starting torque. high starting torque. zero starting torque. starting torque equal to full-load torque. low starting torque. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be 2.74 Ω. 2.241 Ω. 2.781 Ω. 25.564 Ω. 2.74 Ω. 2.241 Ω. 2.781 Ω. 25.564 Ω. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because field winding was wrongly connected field resistance was higher than critical resistance there was a break in the armature circuit there was no residual magnetism in the field circuit field winding was wrongly connected field resistance was higher than critical resistance there was a break in the armature circuit there was no residual magnetism in the field circuit ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by increasing field excitation. shifting the brush axis from GNA to MNA. fixing the brush axis inline with the pole axis. compensating winding and commutating poles. increasing field excitation. shifting the brush axis from GNA to MNA. fixing the brush axis inline with the pole axis. compensating winding and commutating poles. ANSWER DOWNLOAD EXAMIANS APP
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