railway RRB JE (CBT I + CBT II) Mock Test 2024 Electrical Machines Alternator and Synchronous Motors
For a three phase, 4-pole, 50 Hz synchronous motor, the frequency, pole number and the load torque are all halved. The motor speed will be:
1
1500 rpm
2
375 rpm
3
75 rpm
4
3000 rpm