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Which of the following statements are true about electromagnetic torques and reluctance torques?
(i) electromagnetic torque can exist only if both windings carry current
(ii) reluctance torque depend on the direction of current in stator or rotor windings
(iii) reluctance torque doesn't depend on the direction of current in stator or rotor windings
(iv) electromagnetic torque depend on the direction of currents is and ir
(v) electromagnetic torque doesn't depend on the direction of currents is and ir
  • a)
    (i), (ii), (iii)
  • b)
    (ii), (iii), (v)
  • c)
    (i), (iii), (iv)
  • d)
    (ii), (iii), (iv)
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Which of the following statements are true about electromagnetic torqu...
The correct answer is option 'C': (i), (iii), (iv).

Explanation:
(i) Electromagnetic torque can exist only if both windings carry current:
- Electromagnetic torque is generated in an electric motor when there is a magnetic field interaction between the stator and rotor windings. This magnetic field is created by the current flowing through both the stator and rotor windings. Therefore, electromagnetic torque can exist only if both windings carry current.

(iii) Reluctance torque doesn't depend on the direction of current in stator or rotor windings:
- Reluctance torque is a type of torque that arises due to the variation in the magnetic reluctance of the magnetic path between the stator and rotor of an electric motor. It is independent of the direction of current in the stator or rotor windings. Reluctance torque is generated when the stator and rotor teeth are not aligned properly, causing a variation in the magnetic reluctance and resulting in torque production.

(iv) Electromagnetic torque depends on the direction of currents in the stator and rotor windings:
- The direction of current in the stator and rotor windings plays a crucial role in determining the direction of the magnetic field produced by these windings. The interaction between the magnetic fields of the stator and rotor windings results in the generation of electromagnetic torque. Therefore, the direction of the currents in the stator and rotor windings directly affects the direction of the electromagnetic torque produced.

In summary, electromagnetic torque requires both windings to carry current, and its direction depends on the direction of currents in the windings. On the other hand, reluctance torque is independent of the direction of current in the windings.
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Community Answer
Which of the following statements are true about electromagnetic torqu...
Reluctance torque:
1/2is2dLs/dθr and 1/2ir2dLr/dθr
Positive or negative value of current doesn’t affect the torque direction. The interaction/electromagnetic torque = isirdMsr/dθr, here the direction of is and ir changes the torque.
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Which of the following statements are true about electromagnetic torques and reluctance torques?(i) electromagnetic torque can exist only if both windings carry current(ii) reluctance torque depend on the direction of current in stator or rotor windings(iii) reluctance torque doesnt depend on the direction of current in stator or rotor windings(iv) electromagnetic torque depend on the direction of currents is and ir(v) electromagnetic torque doesnt depend on the direction of currents is and ira)(i), (ii), (iii)b)(ii), (iii), (v)c)(i), (iii), (iv)d)(ii), (iii), (iv)Correct answer is option 'C'. Can you explain this answer?
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Which of the following statements are true about electromagnetic torques and reluctance torques?(i) electromagnetic torque can exist only if both windings carry current(ii) reluctance torque depend on the direction of current in stator or rotor windings(iii) reluctance torque doesnt depend on the direction of current in stator or rotor windings(iv) electromagnetic torque depend on the direction of currents is and ir(v) electromagnetic torque doesnt depend on the direction of currents is and ira)(i), (ii), (iii)b)(ii), (iii), (v)c)(i), (iii), (iv)d)(ii), (iii), (iv)Correct answer is option 'C'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about Which of the following statements are true about electromagnetic torques and reluctance torques?(i) electromagnetic torque can exist only if both windings carry current(ii) reluctance torque depend on the direction of current in stator or rotor windings(iii) reluctance torque doesnt depend on the direction of current in stator or rotor windings(iv) electromagnetic torque depend on the direction of currents is and ir(v) electromagnetic torque doesnt depend on the direction of currents is and ira)(i), (ii), (iii)b)(ii), (iii), (v)c)(i), (iii), (iv)d)(ii), (iii), (iv)Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements are true about electromagnetic torques and reluctance torques?(i) electromagnetic torque can exist only if both windings carry current(ii) reluctance torque depend on the direction of current in stator or rotor windings(iii) reluctance torque doesnt depend on the direction of current in stator or rotor windings(iv) electromagnetic torque depend on the direction of currents is and ir(v) electromagnetic torque doesnt depend on the direction of currents is and ira)(i), (ii), (iii)b)(ii), (iii), (v)c)(i), (iii), (iv)d)(ii), (iii), (iv)Correct answer is option 'C'. Can you explain this answer?.
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