Electrical Machines DC generator will not build up voltage due to wrong direction of rotation. if it has lost residual magnetism. if field resistance is more than critical resistance. any one of above. due to wrong direction of rotation. if it has lost residual magnetism. if field resistance is more than critical resistance. any one of above. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Quadrature axis synchronous reactance is the ratio of Vmin to Imax. Vmin to Imin. Vmax to Imin. Vmax to Imax. Vmin to Imax. Vmin to Imin. Vmax to Imin. Vmax to Imax. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is (3/2)Fmax. Fmax. (1/2)Fmax. 3Fmax. (3/2)Fmax. Fmax. (1/2)Fmax. 3Fmax. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor None of these will become leading will become lagging will remain the same None of these will become leading will become lagging will remain the same ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An inverted V-curve of synchronous motor shows the variation of supply voltage and field current at constant excitation All of these power factor and supply voltage during hunting power factor and dc excitation at constant load supply voltage and field current at constant excitation All of these power factor and supply voltage during hunting power factor and dc excitation at constant load ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of rotation of a 3 - Φ induction motor can be reversed by disconnecting any one phase. transposing any two leads from supply. transposing any two leads from slip rings. transposing all the three leads from the supply. disconnecting any one phase. transposing any two leads from supply. transposing any two leads from slip rings. transposing all the three leads from the supply. ANSWER DOWNLOAD EXAMIANS APP
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