Which of the following statements about voltage regulation of an alternator is NOT correct?

The correct answer is option 2):

Concept:

• An alternator operating at lower leading power factors, the voltage rises with increase of the load and hence, the voltage regulation is negative.
• For a certain leading power factor, the full-load voltage regulation is zero. 
• The voltage regulation of the alternator can be defined as the change in terminal voltage from no-load to full load rated value divided by the full-load rated voltage

\(\mathrm{Percentage\:voltage\:regulation =\frac{|𝐸_{𝑎}| − |𝑉|}{|𝑉|}× 100\%} \)

• |𝐸𝑎| is the magnitude of generated voltage (or no-load voltage) perphase
• |𝑉| is the magnitude of full-load rated terminal voltage per phase
• The voltage regulation of an alternator depends upon the power factor of the load, i.e.,
• An alternator operating at a unity power factor has a small positive voltage regulation.
• An alternator operating at a lagging power factor has a large positive voltage regulation.
• Parallel operation of one alternator, with other alternators, is affected considerably by its voltage regulation.
• Voltage regulation determines the type of automatic voltage-control equipment to be used.
• Steady state short-circuit conditions and stability are affected by the voltage regulation.
• So option 2 is wrong