Quiz on Basics of Electrical & Electronics Engineering

What is the unit of frequency?

• Ohms (Ω)

• Amperes (A)

• Volts (V)

• Hertz (Hz)

In a purely resistive AC circuit, the phase difference between voltage and current is:

• 90 degrees

• 180 degrees

• 0 degrees

• 45 degrees

What is the average value of an alternating current?

• The steady current that transfers the same charge

• The maximum current

• The RMS value

• The peak current

What does RMS stand for?

• Root Mean Square

• Real Mean Square

• Regular Mean Square

• Radial Mean Square

In three-phase AC systems, the phase voltages are displaced by how many degrees?

• 180 degrees

• 120 degrees

• 90 degrees

• 60 degrees

What is the formula for calculating the peak factor (Kp)?

• Kp = Maximum Value / Average Value

• Kp = Maximum Value / RMS Value

• Kp = RMS Value / Average Value

• Kp = Average Value / Maximum Value

What is the term for the maximum variation between the maximum positive and negative instantaneous values?

• Average Value

• RMS Value

• Peak-to-Peak Value

• Peak Value

In a purely inductive AC circuit, the current:

• Is in phase with voltage

• Lags voltage by 90 degrees

• Is out of phase by 180 degrees

• Leads voltage by 90 degrees

What is the relationship between line and phase voltages in a star connection?

• Line Voltage = Phase Voltage / √3

• Line Voltage = 2 * Phase Voltage

• Line Voltage = Phase Voltage

• Line Voltage = √3 * Phase Voltage

What is the average power consumed by a pure inductor when connected to an AC voltage?

• Negative

• Zero

• Positive

• Depends on frequency