Electrical Machines The breakdown torque of a synchronous motor varies as 1/V² applied voltage V V² 1/V 1/V² applied voltage V V² 1/V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed? 16.55 Nm Zero 15.28 Nm 15.6 Nm 16.55 Nm Zero 15.28 Nm 15.6 Nm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be 2000 rpm 250 rpm 1000 rpm 500 rpm 2000 rpm 250 rpm 1000 rpm 500 rpm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Hysteresis loss is proportional to f1.5. f2. f3. f. f1.5. f2. f3. f. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Maximum power will be developed when back emf is double the supply voltage. All of these equal to supply voltage. half of the supply voltage. double the supply voltage. All of these equal to supply voltage. half of the supply voltage. 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% 82.5% 67.5% 78.5% 72.5% 82.5% 67.5% ANSWER DOWNLOAD EXAMIANS APP
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