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What is the application of overexcited synchronous motors? 

This question was previously asked in
SSC JE Electrical 4 Dec 2023 Official Paper II
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  1. Operating centrifugal pumps 
  2. Controlling voltage at the end of long transmission lines 
  3. Power factor correction for lagging loads 
  4. Generating different frequencies 

Answer (Detailed Solution Below)

Option 3 : Power factor correction for lagging loads 
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Explanation:

The correct answer is 3) Power factor correction for lagging loads.

  • Overexcited synchronous motors are employed in power systems for power factor correction.
  • By adjusting the excitation level, these motors can provide leading reactive power, compensating for the lagging reactive power drawn by inductive loads.
  • This helps improve the overall power factor of the system, making it more efficient and reducing energy losses.
  • This application is crucial in industrial settings where the power factor needs optimization to enhance the utilization of electrical power, minimize penalties associated with poor power factor, and improve the overall efficiency of the electrical distribution system.
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-> SSC JE Electrical 2025 Notification will be released on June 30 for the post of Junior Engineer Electrical/ Electrical & Mechanical.

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More Alternator and Synchronous Motors Questions

Q1.Which statements about voltage drop in an alternator are correct? I. The voltage drop due to armature resistance (IaRa) is in phase with the armature current (Ia). II. At unity power factor, the voltage drop IaRa directly subtracts from the generated EMF (E). III. For a leading power factor load, IaRa contributes to an increase in terminal voltage (V). IV. Armature resistance has no effect on voltage regulation.
Q2.Why are salient pole rotors NOT used in turbo alternators?
Q3.Compared to the MMF method, the EMF method is ___________.
Q4.Which application is a common use of synchronous motors? 
Q5.Under constant mechanical load, changing the excitation of a synchronous motor affects which of the following? I. Power factor II. Armature current magnitude III. Speed of the motor IV. Real power output 
Q6.In an alternator, if the load power factor changes from lagging to leading, the armature reaction effect shifts from:
Q7.Which statements about the maximum power output of a cylindrical rotor synchronous generator are correct? I. Maximum power output occurs when the load angle (δ) is 90°. II. Maximum power is proportional to the square of the terminal voltage (V). III. Over-excitation increases the generator’s maximum power capability. IV. Maximum power is independent of the synchronous reactance (Xs).
Q8.Stray load losses in synchronous motors are caused by __________. 
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More Electrical Machines Questions

Q1.If a 6-pole induction motor operates on a 60 Hz supply, its synchronous speed is _____________.
Q2.How are the segments of the commutator insulated from each other?
Q3.Which statements about voltage drop in an alternator are correct? I. The voltage drop due to armature resistance (IaRa) is in phase with the armature current (Ia). II. At unity power factor, the voltage drop IaRa directly subtracts from the generated EMF (E). III. For a leading power factor load, IaRa contributes to an increase in terminal voltage (V). IV. Armature resistance has no effect on voltage regulation.
Q4.What does the flux created by the load current in the primary winding, which links only with the primary winding, represent?
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Q7.In the equivalent circuit without core losses, the magnetising branch consists of __________. 
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Q10.The same polarity condition is essential in parallel operation because: 
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