Question 1 of 10
What is the primary difference between AC and DC circuits regarding insulation requirements?
AC voltage polarity changes, putting more stress on insulation compared to DC at the same voltage level.
Question 2 of 10
In a purely inductive circuit, what is the phase relationship between voltage and current?
In an inductor, voltage always leads the current by 90 degrees.
Question 3 of 10
What is the unit of measurement for apparent power?
Apparent power, which is the product of voltage and current, is measured in Volt-Amperes (VA).
Question 4 of 10
What is the power factor in a purely capacitive circuit?
In a purely capacitive circuit, the power factor is 0, and the current leads the voltage by 90 degrees, thus the power factor is leading.
Question 5 of 10
What is the effect of increasing the inductance (L) or inductive reactance (XL) in an inductive circuit?
Increasing inductance or inductive reactance opposes the flow of current, thus reducing it.
Question 6 of 10
What is the relationship between the operating frequency and the output of a transformer?
Transformers generally provide higher output at higher frequencies because the inductive reactance increases.
Question 7 of 10
In a three-phase system, what is the typical phase shift between the voltage waveforms?
Three-phase systems have a 120-degree phase shift between the voltage waveforms.
Question 8 of 10
What is the role of a capacitor in an AC circuit?
Capacitors store electrical energy in the form of an electric field and oppose changes in voltage.
Question 9 of 10
Why is power often zero in a purely inductive or capacitive circuit?
In purely inductive or capacitive circuits, the phase difference is 90 degrees, resulting in zero average power.
Question 10 of 10
What causes fault currents to be dangerously high in a power system?
Low impedance in the fault path allows a large current to flow, causing high fault currents.
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