Electrical Machines In a DC machine current and emf at the terminals are alternating. current and emf in armature are alternating. current and emf in armature are unidirectional emf in armature conductors and at the terminals is alternating. current and emf at the terminals are alternating. current and emf in armature are alternating. current and emf in armature are unidirectional emf in armature conductors and at the terminals is alternating. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P) T∝ P² T∝ P T is independent of P T∝ P³ T∝ P² T∝ P T is independent of P T∝ P³ ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is/are the necessary conditions for voltage build up in self excited generator? Poles should contain residual flux. Field winding resistance should be less than critical resistance. Field winding should be properly connected to armature winding. All of these Poles should contain residual flux. Field winding resistance should be less than critical resistance. Field winding should be properly connected to armature winding. All of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC generator the emf generated by the armature is maximum when rate of change of flux is maximum. rate of change of flux is minimum. shaft rotation is high. induced voltage is high. rate of change of flux is maximum. rate of change of flux is minimum. shaft rotation is high. induced voltage is high. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as T2 ∝ P3. T ∝ P. T is independent of P. T ∝ √P. T2 ∝ P3. T ∝ P. T is independent of P. T ∝ √P. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The speed of a cumulatively compound DC motor can be controlled by varying Any of above. Armature voltage control. Shunt field resistance control. Armature resistance control. Any of above. Armature voltage control. Shunt field resistance control. Armature resistance control. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS