Electrical Machines A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be 75 W 168.75 W 112.5 W 50 W 75 W 168.75 W 112.5 W 50 W ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________. remains same. decreased. increased. kept constant to certain value. remains same. decreased. increased. kept constant to certain value. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A motor operates in stable region at which of the following slip? low slip region both 1 and 2 unity slip high slip region low slip region both 1 and 2 unity slip high slip region ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The crawling in the induction motor is caused by harmonics developed in the motor low voltage supply improper design of stator laminations high loads harmonics developed in the motor low voltage supply improper design of stator laminations high loads ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be, 4. 12. 3. 7. 4. 12. 3. 7. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature core of the rotor bars of dc motors are laminated to reduce eddy current loss. to reduce mechanical losses. to provide better flux linkage. to reduce hysteresis loss. to reduce eddy current loss. to reduce mechanical losses. to provide better flux linkage. to reduce hysteresis loss. ANSWER DOWNLOAD EXAMIANS APP
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