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It is important to ventilate a ship’s battery locker to

• Reduce the risk of explosion

• Keep the cell tops dry

• Prevent sulphation on the terminals

• Allow oxygen into the locker to assist charging

what is the voltage of a just charged new lead battery at a slow charge (I= 0,1 C, used as reserved power source in GMDSS installations and possessing 12 cells)?

• 24 – 26

• 28 – 30

• 22 – 24

• 12 – 14

GMDSS batteries must be:

• Changed every other year

• Checked/tested every three months

• Checked for necessary capacity by authorized service every year

• Checked only by PSCI with special battery checker

When measuring the specific gravity, a fully charged lead acid battery in good condition is

• Between 1250 and 1280

• Between 1100 and 1210

• 1080

• 1150

The electrolyte of a lead acid battery is

• Dilute sulphuric acid

• Concentrated sulphuric acid

• Dilute hydrochloric acid

• Concentrated hydrochloric acid

When maintaining lead acid batteries, protective clothing should be worn because

• Corrosive electrolyte is used

• The battery compartment may be in a dangerous location

• There is risk of electric shock

• Volatile gasses may be emitted

A lead acid battery may be considered fully discharged if the specific gravity reading is

• 1150 or higher

• Between 1250 and 1150

• Between 1250 and 1280

• 1150 or lower

How many hours of work a fully charged 24v/235 Ah Lead Acid reserve battery must provide for the radio installation for the purpose of conducting distress and safety communication in case of failure of the ship’s main and emergency sources of electrical power?

• 1.28 hours

• at least one hour

• at least 18 hours

• at least six hours

The specific gravity of lead-acid battery electrolyte is checked with

• A multimeter

• An anemometer

• A densimeter

• A galvanometer

The state of charge of a liquid lead-acid battery can be determined by

• measuring the temperature of the electrolyte

• measuring maximum current under load

• measuring the specific gravity of the electrolyte

• measuring the voltage off load