power factor Quiz Practice Quiz | Power Factor

Q: What is the power factor defined as?

Cosine of the phase angle between voltage and current — Power factor is the cosine of the angle (?) between voltage and current.

Q: A purely resistive circuit has a power factor of:

1 — In a resistive circuit, voltage and current are in phase, making cos(0) = 1.

Q: A purely inductive circuit has a power factor of:

0 — Current lags voltage by 90 degrees in an inductor, cos(90) = 0.

Q: A purely capacitive circuit has a power factor of:

0 — Current leads voltage by 90 degrees in a capacitor, making cos(90) = 0.

Q: What are the units of apparent power?

Volt-Amperes (VA) — Apparent power is the total power, measured in Volt-Amperes (VA).

Q: What are the units of reactive power?

Volt-Amperes Reactive (VAR) — Reactive power is measured in Volt-Amperes Reactive (VAR).

Q: Which of the following is the formula for power factor?

Real Power / Apparent Power — Power factor = Real Power / Apparent Power.

Q: A lagging power factor indicates that the load is primarily:

Inductive — Lagging power factor indicates an inductive load.

Q: A leading power factor indicates that the load is primarily:

Capacitive — Leading power factor indicates a capacitive load.

Q: What is the ideal power factor?

1 — A power factor of 1 is ideal, meaning all power is used effectively.

Question 1 of 15

What is the power factor defined as?

Power factor is the cosine of the angle (?) between voltage and current.

Question 2 of 15

A purely resistive circuit has a power factor of:

In a resistive circuit, voltage and current are in phase, making cos(0) = 1.

Question 3 of 15

A purely inductive circuit has a power factor of:

Current lags voltage by 90 degrees in an inductor, cos(90) = 0.

Question 4 of 15

A purely capacitive circuit has a power factor of:

Current leads voltage by 90 degrees in a capacitor, making cos(90) = 0.

Question 5 of 15

What are the units of apparent power?

Apparent power is the total power, measured in Volt-Amperes (VA).

Question 6 of 15

What are the units of reactive power?

Reactive power is measured in Volt-Amperes Reactive (VAR).

Question 7 of 15

Which of the following is the formula for power factor?

Power factor = Real Power / Apparent Power.

Question 8 of 15

A lagging power factor indicates that the load is primarily:

Lagging power factor indicates an inductive load.

Question 9 of 15

A leading power factor indicates that the load is primarily:

Leading power factor indicates a capacitive load.

Question 10 of 15

What is the ideal power factor?

A power factor of 1 is ideal, meaning all power is used effectively.

Question 11 of 15

How is power factor improved?

Capacitors can be used to compensate for inductive loads, improving power factor.

Question 12 of 15

What are the disadvantages of a low power factor?

Low power factor results in higher current for the same real power, leading to higher losses.

Question 13 of 15

What component is typically used to correct a lagging power factor?

Capacitors provide leading reactive power to counteract lagging reactive power from inductors.

Question 14 of 15

The power factor of a circuit is 0.8 lagging. What does this mean?

Lagging power factor means the current lags the voltage.

Question 15 of 15

If the real power is 1000W and the apparent power is 1250VA, what is the power factor?

Power factor = Real Power / Apparent Power = 1000W / 1250VA = 0.8

power factor Quiz