Question 1 of 10
What is the primary factor that determines power factor?
Power factor is defined as the cosine of the angle between voltage and current.
Question 2 of 10
In a purely resistive AC circuit, what is the power factor?
In a purely resistive circuit, the voltage and current are in phase, resulting in a power factor of 1.
Question 3 of 10
What is the formula for power factor in terms of real power (P) and apparent power (S)?
Power factor is calculated as the ratio of real power to apparent power: PF = P / S.
Question 4 of 10
What is the unit of measurement for apparent power?
Apparent power is measured in Volt-Amperes (VA) or kilo-Volt-Amperes (kVA).
Question 5 of 10
In a purely inductive circuit, what is the power factor and is it leading or lagging?
In a purely inductive circuit, the current lags the voltage by 90 degrees, resulting in a power factor of 0 and is lagging.
Question 6 of 10
What is the power factor defined as in terms of resistance (R) and impedance (Z) in an AC circuit?
Power factor can be calculated as the ratio of resistance to impedance: PF = R / Z.
Question 7 of 10
If the power factor is 0.8 lagging, what does this indicate about the circuit?
A lagging power factor indicates that the current is lagging behind the voltage, typical of an inductive circuit.
Question 8 of 10
In a three-phase AC circuit, how is power factor calculated using line voltage (VL) and line current (IL)?
The power factor in a 3-phase AC circuit using line values is calculated by Cos ? = P / (?3 * VL * IL).
Question 9 of 10
What causes a low power factor in an electrical system?
Inductive loads, such as motors and transformers, cause the current to lag the voltage, resulting in a lower power factor.
Question 10 of 10
What is the primary benefit of improving power factor?
Improving power factor reduces the current drawn for the same amount of real power, leading to reduced losses in the system.
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