Electrical Machines Ward-Leonard system for controlling the speed of a DC motor is used where All of above. The speed in both the direction is required. Very fine speed control over the whole range from zero to normal speed is required. The accuracy in speed control is required. All of above. The speed in both the direction is required. Very fine speed control over the whole range from zero to normal speed is required. The accuracy in speed control is required. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What are the starters used for starting of cage motors? All of these. Star-delta starter. DOL starter. Auto transformer starter. All of these. Star-delta starter. DOL starter. Auto transformer starter. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The inertia constant H of a synchronous condenser is equal to that of the effective length of the line. greater than that of hydro generator. none of these. greater than that of turbo alternator. equal to that of the effective length of the line. greater than that of hydro generator. none of these. greater than that of turbo alternator. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Short circuit test is performed on a transformer with a certain impressed voltage at rated frequency. If the short circuit test is now performed with the same magnitude of impressed voltage, but at frequency higher than the rated frequency then The magnitude will both increase. The magnetude of current will increase, but power factor will decrease. The magnitude of circuit as well as the power factor will decrease. The magnitude of current will decrease but the power factor will increase. The magnitude will both increase. The magnetude of current will increase, but power factor will decrease. The magnitude of circuit as well as the power factor will decrease. The magnitude of current will decrease but the power factor will increase. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In salient pole synchronous machine, the reluctance power varies as cosδ cos2δ sin2δ sinδ cosδ cos2δ sin2δ sinδ ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If starter is not used with large DC motor for starting, it will all of above. damage the armature and commutator. provide execessive voltage drop in line. draw a starting current many times its rated full load current. all of above. damage the armature and commutator. provide execessive voltage drop in line. draw a starting current many times its rated full load current. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS