Electrical Machines If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is √(Pi/Pc) Pi/Pc Pc/Pi (Pi/Pc)2 √(Pi/Pc) Pi/Pc Pc/Pi (Pi/Pc)2 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC generator, the ripples in the direct emf generated are reduced by employing carbon brushes. equalizer rings. commutator with large number of segments. graphite brushes. carbon brushes. equalizer rings. commutator with large number of segments. graphite brushes. 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 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. varying the speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In synchronous motor, the damper winding is generally used to prevent hunting and provide the starting torque. reduce noise level only. provide starting torque only. reduce the eddy currents. prevent hunting and provide the starting torque. reduce noise level only. provide starting torque only. reduce the eddy currents. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the source voltage of a DC motor is increased, which of the following will decrease? Starting torque, operating speed, full load current. Starting torque. Operating speed. Full load current. Starting torque, operating speed, full load current. Starting torque. Operating speed. Full load current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following represents the pitch factor? Cos α Cos (α/2) sin (α/2) Cos α² Cos α Cos (α/2) sin (α/2) Cos α² ANSWER DOWNLOAD EXAMIANS APP
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