Electrical Machines In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be Less than 50 % Any where between 75 % and 90 %. Around 90 % Around 100 %. Less than 50 % Any where between 75 % and 90 %. Around 90 % Around 100 %. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC generators, electric current to the external circuit from armature is given through commutator. slip rings. none of above. solid connection. commutator. slip rings. none of above. solid connection. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the mechanical power developed by a DC series motor is maximum? Back emf is equal to half the applied voltage. None of above. Back emf is equal to applied voltage. Back emf is equal to zero. Back emf is equal to half the applied voltage. None of above. Back emf is equal to applied voltage. Back emf is equal to zero. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When a synchronous motor is running at synchronous speed, the damper winding produces no torque. damping torqe. both 1 and 2. eddy current torque. no torque. damping torqe. both 1 and 2. eddy current torque. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be 6 V 230 V somewhat more than 230 V somewhat less than 230 V 6 V 230 V somewhat more than 230 V somewhat less than 230 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The torque angle, in a synchronous motor, is the angle between magnetizing electric current and back emf. None of these the rotating stator flux and rotor flux. the supply voltage and the back emf. magnetizing electric current and back emf. None of these the rotating stator flux and rotor flux. the supply voltage and the back emf. ANSWER DOWNLOAD EXAMIANS APP
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