Electrical Machines The condition for maximum running torque is zero unity R = S.X 0.707 lagging 0.5 lagging zero unity R = S.X 0.707 lagging 0.5 lagging ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Ward-Leonard system for controlling the speed of a DC motor is used where The accuracy in speed control is required. The speed in both the direction is required. All of above. Very fine speed control over the whole range from zero to normal speed is required. The accuracy in speed control is required. The speed in both the direction is required. All of above. Very fine speed control over the whole range from zero to normal speed is required. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the phase difference between two windings of A.C servomotor ? 120°. 30°. 60°. 90°. 120°. 30°. 60°. 90°. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The self induced emf in the coil undergoing commutation is called the statically induced voltage. dynamically induced voltage. None of these reactance voltage. statically induced voltage. dynamically induced voltage. None of these reactance voltage. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be 30° 72° 18° 36° 30° 72° 18° 36° ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase rotor resistance None of these supply voltage supply frequency rotor resistance None of these supply voltage supply frequency ANSWER DOWNLOAD EXAMIANS APP
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