Cause of low power factor.

Question

Examoogle · Accepted Answer

Both

Explanation: The correct answer is C, as both load characteristic and increase in system voltage can cause a low power factor. Power factor is the ratio of real power to apparent power in an electrical power system. A low power factor indicates that the current and voltage are not in phase, often due to inductive or capacitive loads. Working Principle: The working principle behind a low power factor is largely related to the nature of the load and how it affects the phase difference between voltage and current. Inductive loads, such as motors and transformers, cause the current to lag behind the voltage, while capacitive loads cause the current to lead the voltage. An increase in system voltage can also lead to a low power factor if the load's impedance does not change accordingly, affecting the phase angle between voltage and current. Key Points: Power factor is a measure of how effectively the current is converted into useful work output; Inductive and capacitive loads affect the power factor; Increasing system voltage without adjusting load impedance can lower the power factor; Improving power factor can reduce energy losses and increase the efficiency of the power system Advantages: Reduced energy losses; Increased system efficiency Disadvantages: Increased cost for power factor correction equipment; Complexity in system design Applications: Industrial power systems; Commercial electrical networks; Residential electricity supply Additional Info: Also Known As: Power factor correction. Connected Between / Location: Between the power source and the load. Types: Active and passive power factor correction methods. Standard Values / Years / Dates: Power factor values typically range from 0 to 1, with 1 being the ideal. Wrong Options Explained: Option A is partially correct as load characteristics are a cause, but option B, increase in system voltage, can also contribute to a low power factor, making option C the most comprehensive answer Answer: C is correct — both load characteristic and increase in system voltage can cause a low power factor Exam Tip: Understanding power factor is crucial in industrial power electronics, as it directly impacts the efficiency and cost-effectiveness of electrical power distribution systems, often tested alongside topics like electrical machines and power systems.

Related Questions

Discussion (0)