EEUTI30 FQ1A

Which of the following best explains the fundamental advantage of AC systems over DC systems for power transmission?

• AC systems allow easy voltage transformation using transformers.

• AC systems maintain a constant current

• AC systems require less maintenance.

In the sinusoidal voltage expression v(t) = Xm sin(ωt + φ), what does φ represent?

• The amplitude of the waveform.

• The phase angle.

• The angular frequency.

Which measurement of an AC waveform provides the effective value that indicates its DC equivalent for power delivery?

• Peak value

• Average value

• RMS value

When averaging a full-cycle sinusoidal waveform algebraically (taking into account the sign), its average value is:

• 0

• Equal to the peak value

• Half of the peak value

The term "peak-to-peak value" refers to:

• The maximum value of the waveform

• The full range from the maximum positive to the maximum negative value

• The average of the absolute waveform values

Which historical figure is most closely associated with the development of AC power systems?

• Thomas Edison

• Nikola Tesla

• Michael Faraday

High-voltage AC transmission is preferred because stepping up the voltage reduces the current. Lower current then decreases what type of losses?

• Resistive (I²R) losses in transmission lines

• Energy conversion losses

• Dielectric losses

Given a sinusoid with period T = 0.1257 sec, what is its frequency f?

• 2 Hz

• 7.96 Hz

• 15.92 Hz

Reactive power in an AC circuit:

• Is measured in volt-amperes reactive (VAR)

• Represents the power actually consumed by resistive loads

• Has no impact on overall power transmission

The product of voltage and current without considering the phase difference is known as:

• Real power

• Apparent power

• Reactive power