engineering recuitment MP Vyapam Sub Engineer Mock Test 2024 Electrical Machines Alternator and Synchronous Motors Synchronous Motor Properties
A 400 V, 3-phase synchronous motor has armature current of 150 A. It has synchronous resistance and reactance of 0.4 Ω and 4 Ω per phase, respectively. If the power developed is 130 kW and the iron and friction losses are 1 kW, then the efficiency of the motor will be ______.
1
91.6%
2
75%
3
81.6%
4
60%