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Consider the following statements regarding synchronous machines:
1. In an alternator, armature mmf leads the field flux
2. In an alternator, airgap flux lags the field flux
3. In a synchronous motor, armature mmf leads the field flux
4. In an alternator, field flux lags the armature current
From these, the correct answer is
  • a)
    2, 3
  • b)
    1, 3, 4
  • c)
    2, 3, 4
  • d)
    1, 2, 3
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Consider the following statements regarding synchronous machines:1. In...
1. In an alternator, armature mmf lags the field flux
2. In an alternator, airgap flux lags the field flux
3. In a synchronous motor, armature mmf leads the field flux
4. In an alternator, field flux leads the armature current
View all questions of this test
Most Upvoted Answer
Consider the following statements regarding synchronous machines:1. In...
Explanation:
In synchronous machines, such as alternators and synchronous motors, the armature mmf (magnetomotive force) and the field flux play important roles in generating and controlling the machine's operation. Let's analyze each statement to determine the correct answer.

Statement 1: In an alternator, armature mmf leads the field flux.
This statement is incorrect. In an alternator, the armature mmf lags the field flux. The armature mmf is produced by the armature current flowing through the armature windings, while the field flux is produced by the field current flowing through the field windings. The armature mmf lags the field flux by an electrical angle of 90 degrees in an alternator.

Statement 2: In an alternator, airgap flux lags the field flux.
This statement is correct. In an alternator, the airgap flux lags the field flux. The airgap flux is the flux that crosses the airgap between the rotor and the stator. This flux is generated by the field current flowing through the field windings and is responsible for inducing a voltage in the armature windings.

Statement 3: In a synchronous motor, armature mmf leads the field flux.
This statement is correct. In a synchronous motor, the armature mmf leads the field flux. The armature mmf is produced by the armature current flowing through the armature windings, and the field flux is produced by the field current flowing through the field windings. The armature mmf leads the field flux by an electrical angle of 90 degrees in a synchronous motor.

Statement 4: In an alternator, field flux lags the armature current.
This statement is incorrect. In an alternator, the field flux does not lag the armature current. The field flux and the armature current are independent of each other. The field flux is generated by the field current flowing through the field windings, while the armature current is generated by the load connected to the alternator.

Therefore, the correct answer is option A: 2, 3.
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Consider the following statements regarding synchronous machines:1. In an alternator, armature mmf leads the field flux2. In an alternator, airgap flux lags the field flux3. In a synchronous motor, armature mmf leads the field flux4. In an alternator, field flux lags the armature currentFrom these, the correct answer isa)2, 3b)1, 3, 4c)2, 3, 4d)1, 2, 3Correct answer is option 'A'. Can you explain this answer?
Question Description
Consider the following statements regarding synchronous machines:1. In an alternator, armature mmf leads the field flux2. In an alternator, airgap flux lags the field flux3. In a synchronous motor, armature mmf leads the field flux4. In an alternator, field flux lags the armature currentFrom these, the correct answer isa)2, 3b)1, 3, 4c)2, 3, 4d)1, 2, 3Correct answer is option 'A'. 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 Consider the following statements regarding synchronous machines:1. In an alternator, armature mmf leads the field flux2. In an alternator, airgap flux lags the field flux3. In a synchronous motor, armature mmf leads the field flux4. In an alternator, field flux lags the armature currentFrom these, the correct answer isa)2, 3b)1, 3, 4c)2, 3, 4d)1, 2, 3Correct answer is option 'A'. 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 Consider the following statements regarding synchronous machines:1. In an alternator, armature mmf leads the field flux2. In an alternator, airgap flux lags the field flux3. In a synchronous motor, armature mmf leads the field flux4. In an alternator, field flux lags the armature currentFrom these, the correct answer isa)2, 3b)1, 3, 4c)2, 3, 4d)1, 2, 3Correct answer is option 'A'. Can you explain this answer?.
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