Electrical Machines The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________. 4. 8. 2. 6. 4. 8. 2. 6. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines As compared to DOL starting, a cage induction motor with star-delta starting shall have smoother acceleration. reduced starting current. more starting torque. more starting time. smoother acceleration. reduced starting current. more starting torque. more starting time. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required 0.66 Ω. 0.24 Ω. 0.78 Ω. 0.45 Ω. 0.66 Ω. 0.24 Ω. 0.78 Ω. 0.45 Ω. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Torque developed in the rotor is either of these directly proportional to slip inversely proportional to slip not dependent on the slip either of these directly proportional to slip inversely proportional to slip not dependent on the slip ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In large sized DC machines the compensating windings are provided to neutralize voltage induced in coil due to fluctuation of l reduce eddy current losses by providing local short circuits. None of these compensate for the decrease in speed due to increase of load. neutralize voltage induced in coil due to fluctuation of l reduce eddy current losses by providing local short circuits. None of these compensate for the decrease in speed due to increase of load. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An inverted V curve of synchronous motor shows variation of supply voltage and field current at constant excitation. power factor and supply voltage during hunting. supply voltage and excitation current at constant load. power factor and DC excitation at constant load. supply voltage and field current at constant excitation. power factor and supply voltage during hunting. supply voltage and excitation current at constant load. power factor and DC excitation at constant load. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS