GROL - General Radiotelephone Operator License Power Sources and Distribution Questions and Answers

Question 1

A technician is servicing the power supply for a ship's primary HF transmitter.
The technician observes that after the rectifier stage, the DC voltage has significant pulsating variations.
Which component is most likely malfunctioning or missing?

Accepted Answer

The filter capacitor

Answer

The step-down transformer

Answer

The voltage regulator

Answer

The power indicator LED

Question 2

Under GMDSS regulations, a ship is equipped with an emergency generator. What is the minimum duration that the reserve source of energy (typically batteries) must be able to power the essential radio equipment?

Accepted Answer

1 hour

Answer

30 minutes

Answer

6 hours

Answer

3 hours

Question 3

When performing routine maintenance on a bank of flooded lead-acid batteries used as a reserve power source, what is the correct fluid to add if the electrolyte level is low?

Accepted Answer

Distilled water

Answer

Sulfuric acid

Answer

Tap water

Answer

Saltwater solution

Question 4

In a marine radio installation's DC power supply, what is the primary function of the voltage regulator circuit?

Accepted Answer

To maintain a constant output voltage despite fluctuations in input voltage or load.

Answer

To convert the ship's AC power to DC power.

Answer

To increase the amperage available to the transmitter.

Answer

To filter out RF noise from the DC power lines.

Question 5

A vessel's GMDSS console is powered by a 24V battery bank as its reserve source of energy. During a capacity test, the technician must monitor the voltage to avoid a deep discharge. For a typical nickel-based battery pack, discharging a cell below what voltage level can cause irreversible damage?

Accepted Answer

1.0V per cell

Answer

1.5V per cell

Answer

0.5V per cell

Answer

1.2V per cell

Question 6

Which of the following is an essential and routine maintenance practice for ensuring the reliability of terminal connections on a lead-acid battery bank used for emergency power?

Accepted Answer

Applying a solution of baking soda and water to clean away corrosion.

Answer

Painting the terminals with marine-grade paint to prevent water intrusion.

Answer

Frequently spraying the terminals with saltwater to improve conductivity.

Answer

Leaving terminal connections slightly loose to allow for thermal expansion.