Question

Which method provides the most accurate results for the voltage regulation of a non-salient pole alternator?

• A. EMF method
• B. MMF method
• C. Poitier Triangle method
• D. Direct loading test

Hint:

Poitier triangle method gives more accurate voltage regulation because it separates leakage reactance and armature reaction.

Answer 1

The Correct Option is C

Concept: Voltage regulation of an alternator can be determined by different methods such as EMF method, MMF method, and Poitier triangle method.

Step 1: The EMF method is also called the synchronous impedance method.

Step 2: It gives pessimistic or higher value of voltage regulation because it combines armature reaction and leakage reactance together.

Step 3: The MMF method gives optimistic or lower value of voltage regulation.

Step 4: The Poitier triangle method separates leakage reactance voltage drop and armature reaction effect.

Step 5: Because it separates these effects, it gives more accurate results for non-salient pole alternators. Therefore: \[ \boxed{\text{Poitier Triangle method}} \]