Electrical Machines Commutation in a DC machine may be explained as a process by which electric current in a coil is reversed. by virtue of which emf is induced in the armature conductors. in which magnetic field is set up. how alternate flux affects the main field flux. by which electric current in a coil is reversed. by virtue of which emf is induced in the armature conductors. in which magnetic field is set up. how alternate flux affects the main field flux. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is 0.6. 1. 0.4. 0.8. 0.6. 1. 0.4. 0.8. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following statement is correct, if short circuit ratio is high? Good voltage regulation High voltage regulation None of these Low short circuit current Good voltage regulation High voltage regulation None of these Low short circuit current ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then Ph will decrease but Pe will remain same Pe will increase but Ph will decrease Ph will increase but Pe will decrease both hysteresis loss(Ph) and eddy current loss(Pe) will increase Ph will decrease but Pe will remain same Pe will increase but Ph will decrease Ph will increase but Pe will decrease both hysteresis loss(Ph) and eddy current loss(Pe) will increase ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a synchronous motor, damper windings are provided on None of these rotor shaft. stator frame. pole faces. None of these rotor shaft. stator frame. pole faces. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same? 0 any of the above 0.5 1 0 any of the above 0.5 1 ANSWER DOWNLOAD EXAMIANS APP
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