SSC JE Electrical Engineering 23 Jan 2018 Evening Paper

Question : 196 of 200

Marks: +1, -0

In a synchronous motor running with fixed excitation, when the load is increased two times, its torque angle becomes approximately

half
twice
four times
no change

Validate

Solution:

Synchronous motor is constant speed motor if load is increase two time, then its torque angle increase approximately two time because
Torque (T) = Power × speed
Power

={\VE\sin δ}/X_s

Due to approximately linear relation between power and Torque angle.

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