Electrical Machines For satisfactory parallel operation of two transformers which of the following conditions is most essential, voltage ratio of all transformers must be same. MVA rating of all transformer inversely proportional to impedance. percentage impedance of all transformers must be same. polarities of all transformers must be same. voltage ratio of all transformers must be same. MVA rating of all transformer inversely proportional to impedance. percentage impedance of all transformers must be same. polarities of all transformers must be same. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What will be the eddy current loss if the supply frequency of a transformer becomes double? Remains same. Eight times. Four times. Doubled. Remains same. Eight times. Four times. Doubled. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature mmf of a DC machine has triangular space distribution and is stationary in space. triangular space distribution and rotates at the speed of armature. trapezoidal space distribution and is stationary in space. stepped distribution and rotates at the speed of armature. triangular space distribution and is stationary in space. triangular space distribution and rotates at the speed of armature. trapezoidal space distribution and is stationary in space. stepped distribution and rotates at the speed of armature. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm? 35 Hz. Can be determined. 30 Hz. 20 Hz. 35 Hz. Can be determined. 30 Hz. 20 Hz. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Under commutation results in sparking at the leading edge of the brush. no sparking. sparking the trailing edge of the brush. sparking at the middle of the brush. sparking at the leading edge of the brush. no sparking. sparking the trailing edge of the brush. sparking at the middle of the brush. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Secondary winding of an auto transformer is also called tertiary winding. common winding. compensating winding. damping winding. tertiary winding. common winding. compensating winding. damping winding. ANSWER DOWNLOAD EXAMIANS APP
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