GROL General Radiotelephone 2

Question 1

What is the formula for calculating the wavelength of a radio signal in free space?

Accepted Answer

λ = c / f

Answer

Wavelength (λ) equals the speed of light (c ≈ 300,000 km/s) divided by frequency (f).

Question 2

Which type of modulation is most susceptible to atmospheric noise and static interference?

Accepted Answer

Amplitude Modulation (AM)

Answer

AM is most susceptible to noise because noise affects signal amplitude, directly degrading the recovered audio.

Question 3

In a series resonant circuit, what happens to impedance at the resonant frequency?

Accepted Answer

Impedance is at minimum

Answer

At resonance in a series circuit, inductive and capacitive reactances cancel, leaving only the small resistance, so impedance is minimum.

Question 4

What is the function of a limiter stage in an FM receiver?

Accepted Answer

Removes amplitude variations from the IF signal

Answer

The limiter clips amplitude variations caused by noise before the discriminator, preventing noise from affecting the demodulated audio.

Question 5

Which FCC license is required to operate a ship station's MF/HF Single Sideband radio?

Accepted Answer

General Radiotelephone Operator License (GROL)

Answer

A GROL is required to operate, adjust, or repair MF/HF SSB ship stations used for distress and safety communications.

(GROL) General Radiotelephone Operator License Practice Test