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Factors Affecting Alternator EMF

Consider the following statements: EMF induced per phase in an alternator depends on 1. Frequency 2. Number of turns per phase 3. Pitch factor 4. Distribution factor Select the correct option:

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Answer & Explanation

Correct AnswerC. 1, 2, 3 and 4

Quick Explanation

The generated RMS emf per phase is E=4.44 k_p k_d f Φ T. It therefore depends on frequency, turns per phase, pitch factor and distribution factor (and flux per pole). All four listed factors affect the induced emf, so option C.

Formula / Key Relation

Ephase=4.44 kp kd f Φ T

Factors Affecting Alternator EMF explanatory diagram

Detailed Explanation

Correct Answer

C — 1, 2, 3 and 4

Concept and Reasoning

Calculation / Key Relation

Ephase=4.44 kp kd f Φ T

Exam Takeaway

Alternator emf equation directly lists the relevant winding and frequency factors.

Common Mistake

Do not omit winding factors kp or kd when the winding is short-pitched/distributed.

Quick Trick

Alternator emf equation directly lists the relevant winding and frequency factors.

Common Mistake

Do not omit winding factors kp or kd when the winding is short-pitched/distributed.

Exam Tip

Alternator emf equation directly lists the relevant winding and frequency factors.

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QP-112-202425.pdf2024Q. 162

Factors Affecting Alternator EMF

Quick Explanation

Formula / Key Relation

Detailed Explanation

Correct Answer

Concept and Reasoning

Calculation / Key Relation

Exam Takeaway

Common Mistake

Quick Trick

Common Mistake

Exam Tip

Previous Exam Appearances

More Questions From This Concept

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