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Q#1 Synchronous Machines GATE EE 2025 NAT +1 mark -0 marks

The induced emf in a  pole, 3-phase star connected synchronous motor is considered to be equal and in phase with the terminal voltage under no load condition. On application of a mechanical load, the induced emf phasor is deflected by an angle of  mechanical with respect to the terminal voltage phasor. If the synchronous reactance is , and stator resistance is negligible, then the motor armature current magnitude, in ampere, during loaded condition is closest to, _________ (round off to two decimal places).

Explanation:

  poles P=4,  connected synchronous motor

Under No-load-  (equal in magnitude & in-phase)

At load:  mechanical (given),

 

 

 

From phasor diagram,

 

 

And,

 

In

 

 

 

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