HAM FREE HAM Radio Extra Class Test Advanced Electrical Principles Questions and Answers 2

Question 1

What is the resonant frequency of a series RLC circuit with an inductance of 10 microhenries and a capacitance of 100 picofarads?

Accepted Answer

5.03 MHz

Answer

10.1 MHz

Answer

15.9 MHz

Answer

1.59 MHz

Question 2

In a circuit operating at 14 MHz, what is the reactance of a 300 picofarad capacitor?

Accepted Answer

37.9 ohms

Answer

75.8 ohms

Answer

18.9 ohms

Answer

151.6 ohms

Question 3

What happens to the impedance of a parallel resonant circuit at the resonant frequency?

Accepted Answer

Impedance reaches its maximum value

Answer

Impedance reaches its minimum value

Answer

Impedance equals zero

Answer

Impedance becomes purely capacitive

Question 4

What is the skin effect in a conductor at RF frequencies?

Accepted Answer

Current tends to flow near the surface of the conductor

Answer

Current flows uniformly through the conductor cross-section

Answer

Current flows only through the center of the conductor

Answer

Current reverses direction at the conductor surface

Question 5

What is the power factor of a circuit with a phase angle of 45 degrees between voltage and current?

Accepted Answer

0.707

Answer

0.500

Answer

0.866

Answer

1.000

Question 6

What is the Q factor of a series RLC circuit with a resistance of 5 ohms, an inductance of 10 microhenries at a resonant frequency of 7.1 MHz?

Accepted Answer

89.2

Answer

44.6

Answer

178.4

Answer

22.3