Electrical Machines Dynamic braking is very effective for series motors. differential compound motors. separately excited motors. shunt motors. series motors. differential compound motors. separately excited motors. shunt motors. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The mechanical power is developed by a DC motor is maximum when back emf is equal to twice of applied voltage. back emf is equal to applied voltage. back emf is equal to half of applied voltage. none of above. back emf is equal to twice of applied voltage. back emf is equal to applied voltage. back emf is equal to half of applied voltage. none of above. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Cross magnetization effects which of the following? reduction in main field flux reduces the terminal voltage commutation both 2 and 3 reduction in main field flux reduces the terminal voltage commutation both 2 and 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor Remains same. Decrease. Increase. None of these. Remains same. Decrease. Increase. None of these. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is 1. slip X 59 / 3. slip X 50 / 3. slip X 69 / 3. 1. slip X 59 / 3. slip X 50 / 3. slip X 69 / 3. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by varying the speed. changing the field excitation. changing the load. varying the applied voltage. varying the speed. changing the field excitation. changing the load. varying the applied voltage. ANSWER DOWNLOAD EXAMIANS APP
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