Electrical Machines The main purpose of providing tertiary winding in a three phase transformer is to interconnect three voltage systems. None of these to carry extra load. to suppress harmonic and unbalance in voltage. to interconnect three voltage systems. None of these to carry extra load. to suppress harmonic and unbalance in voltage. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is 1 Hz 5 Hz 0 Hz 50 Hz 1 Hz 5 Hz 0 Hz 50 Hz ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence? BYR BRY RBY All of these BYR BRY RBY All of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The speed of a 3-phase induction motor operating in its stable region decreases with increase in the load torque. increases with increase in the load torque. remains constant. decreases with decrease in the load torque. decreases with increase in the load torque. increases with increase in the load torque. remains constant. decreases with decrease in the load torque. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following represents the rotating losses of machine? Hysteresis losses Eddy current losses Friction and windage losses All of the them Hysteresis losses Eddy current losses Friction and windage losses All of the them 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, 7. 4. 12. 3. 7. 4. 12. 3. ANSWER DOWNLOAD EXAMIANS APP
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