GROL General Radiotelephone 4

Question 1

What is the effect on antenna gain when the antenna's physical aperture is doubled while its frequency remains constant?

Accepted Answer

Gain doubles (increases by approximately 3 dB)

Answer

Doubling the aperture area doubles the effective capture area, which doubles power gain — an increase of approximately 3 dB.

Question 2

A GROL licensee is responsible for ensuring which of the following about a ship station transmitter?

Accepted Answer

That it operates within its licensed frequency and power authorizations

Answer

The licensed GROL operator must ensure the transmitter operates on authorized frequencies and within its licensed power limits per FCC Part 80 rules.

Question 3

In a transmission line, what condition causes maximum power transfer from the transmitter to the antenna?

Accepted Answer

The line impedance equals the antenna impedance (matched condition)

Answer

Maximum power transfer occurs when the source, transmission line, and load impedances are all matched, resulting in an SWR of 1:1.

Question 4

What is the function of a squelch circuit in a VHF marine radio?

Accepted Answer

It silences the receiver output when no carrier signal is detected

Answer

The squelch circuit mutes the speaker when no signal is present, eliminating the annoying noise heard between transmissions.

Question 5

Which of the following describes the Automatic Identification System (AIS) used on vessels?

Accepted Answer

A VHF transponder system that broadcasts vessel position, identity, and voyage data

Answer

AIS is a VHF-based system that automatically broadcasts and receives vessel position, identification, speed, and course to nearby ships and shore stations.

(GROL) General Radiotelephone Operator License Practice Test

(GROL) General Radiotelephone Operator License Practice Test

GROL General Radiotelephone 4