Electrical Machines The material used for commutator brushes is mostly copper. mica. cast iron. carbon. copper. mica. cast iron. carbon. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Rotor resistance speed control is used in squirrel cage induction motor. slip ring induction motor. synchronous motor. dc shunt motor. squirrel cage induction motor. slip ring induction motor. synchronous motor. dc shunt motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes 1/2 of the initial value 1/4 of the intial value twice the initial value 4 time the initial value 1/2 of the initial value 1/4 of the intial value twice the initial value 4 time the initial value ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A synchronous motor will deliver maximum power when load angle is 45°. load angle is equal to internal angle θ. load angle is 0°. input power factor is unity. load angle is 45°. load angle is equal to internal angle θ. load angle is 0°. input power factor is unity. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be 0.62. 0.72. 1.24. 0.25. 0.62. 0.72. 1.24. 0.25. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Commutator in DC generator is used for collecting of current convert AC armature current in to DC increase efficiency reduce losses collecting of current convert AC armature current in to DC increase efficiency reduce losses ANSWER DOWNLOAD EXAMIANS APP
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