Question 191Electricity & Electronics - QMED
70% to passIf the excitation of an alternator operating in parallel is decreased below normal and the other above normal, what will be the result on the alternator with the excitation decreased below normal?
Aampere load will be greatly increased
Bpower factor will change in the leading direction
Ckilowatt load will be greatly decreased
Dpower factor will change in the lagging direction
AI Explanation
The correct answer is B) power factor will change in the leading direction. When the excitation of an alternator operating in parallel is decreased below normal, the power factor of that alternator will shift in the leading direction. This is because the decreased excitation results in a drop in the alternator's reactive power output, causing the overall power factor to become more leading. The other options are incorrect because the decreased excitation will not significantly increase the ampere load (A), greatly decrease the kilowatt load (C), or shift the power factor in the lagging direction (D).
Related Questions
Q87:What is the approximate voltage per cell produced by the nickel-iron (Edison) ba... Q67:Under what circumstance would a hand-held portable phase sequence indicator be u... Q532:As shown in the illustrated DC machine which is configured as a generator, what ... Q175:An alternator is being paralleled with one already on the line. At the INSTANT t... Q114:Besides a condition of overload, what could be a cause of an open armature conne...
Ready to test your knowledge?
Take a Electricity & Electronics - QMED Practice ExamOfficial Resources