FREE HAM Radio Extra Class Test Advanced Electrical Principles Questions and Answers

Question 1

In a series RLC circuit at resonance, what is the phase relationship between the current and the applied voltage?

Accepted Answer

The current and voltage are in phase.

Answer

The current leads the voltage by 90 degrees.

Answer

The voltage leads the current by 90 degrees.

Answer

The current and voltage are 180 degrees out of phase.

Question 2

What is the time constant of a series RL circuit containing a 100-ohm resistor and a 20-mH inductor?

Accepted Answer

0.2 milliseconds

Answer

5 microseconds

Answer

2000 seconds

Answer

5000 seconds

Question 3

Which of the following describes the impedance of a parallel RLC circuit at its resonant frequency?

Accepted Answer

It is at its maximum value.

Answer

It is at its minimum value.

Answer

It is purely reactive.

Answer

It is zero.

Question 4

A circuit has an impedance represented by the complex number 30 + j40 ohms. What is the phase angle of the voltage with respect to the current?

Accepted Answer

53.1 degrees leading

Answer

36.9 degrees leading

Answer

53.1 degrees lagging

Answer

45.0 degrees leading

Question 5

In a circuit containing both a resistor and a capacitor connected in series to an AC source, what is the relationship between the current and the voltage?

Accepted Answer

Current leads the voltage.

Answer

Voltage and current are in phase.

Answer

Voltage leads the current.

Answer

Voltage and current are 180 degrees out of phase.

Question 6

What is the resonant frequency of a series circuit with a 10 µH inductor and a 25 pF capacitor?

Accepted Answer

10.1 MHz

Answer

6.37 MHz

Answer

15.9 kHz

Answer

1.59 MHz