Electrical Machines If the back emf in DC motor vanishes suddenly the motor will run at very low speed. run at very high speed. start haunting. burn. run at very low speed. run at very high speed. start haunting. burn. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines We can apply source transformation to voltage source when a resistance is connected to it in 15 HP. 10 HP. 14 HP. 13 HP. 15 HP. 10 HP. 14 HP. 13 HP. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Under commutation results in sparking the trailing edge of the brush. sparking at the middle of the brush. no sparking. sparking at the leading edge of the brush. sparking the trailing edge of the brush. sparking at the middle of the brush. no sparking. sparking at the leading edge of the brush. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to 75°. 0°. 30°. 45°. 75°. 0°. 30°. 45°. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC generator sparking between brushes and commutator surface may be due to any of the above. too rapid reversal of current. over commutation. under commutation. any of the above. too rapid reversal of current. over commutation. under commutation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Commutation in a DC machine may be explained as a process how alternate flux affects the main field flux. by virtue of which emf is induced in the armature conductors. in which magnetic field is set up. by which electric current in a coil is reversed. how alternate flux affects the main field flux. by virtue of which emf is induced in the armature conductors. in which magnetic field is set up. by which electric current in a coil is reversed. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS