Question

Two alternators A and B are in parallel. Alternator A is adjusted to have a leading power factor. This will cause Alternator B to

• A. Also have a leading power factor
• B. Have a lagging power factor
• C. Stop rotating
• D. Carry zero current

Hint:

In parallel alternators, changing excitation mainly affects reactive power sharing and power factor.

Answer 1

The Correct Option is B

Concept: When alternators operate in parallel, change in excitation of one alternator affects the reactive power sharing between the alternators.

Step 1: If excitation of one alternator is changed, its power factor changes.

Step 2: If alternator A is adjusted to have a leading power factor, it supplies or absorbs reactive power differently.

Step 3: Since both alternators are connected in parallel, the other alternator must balance the reactive power demand.

Step 4: Therefore, alternator B will operate at a lagging power factor. Hence: \[ \boxed{\text{Have a lagging power factor}} \]