Key Topic 61: Batteries-2

Question 1

3-61I1: When an emergency transmitter uses 325 watts and a receiver uses 50 watts, how many hours can a 12.6 volt, 55 ampere-hour battery supply full power to both units?

A. 1.8 hours.
B. 6 hours.
C. 3 hours.
D. 1.2 hours.

Answer 1

A. 1.8 hours.

Question 2

3-61I2: What current will flow in a 6 volt storage battery with an internal resistance of 0.01 ohms, when a 3-watt, 6-volt lamp is connected?

A. 0.4885 amps.
B. 0.4995 amps.
C. 0.5566 amps.
D. 0.5795 amps.

Answer 2

B. 0.4995 amps.

Question 3

3-61I3: A ship RADAR unit uses 315 watts and a radio uses 50 watts. If the equipment is connected to a 50 ampere-hour battery rated at 12.6 volts, how long will the battery last?

A. 1 hour 43 minutes.
B. 28.97 hours.
C. 29 minutes.
D. 10 hours, 50 minutes

Answer 3

A. 1 hour 43 minutes.

Question 4

3-61I4: If a marine radiotelephone receiver uses 75 watts of power and a transmitter uses 325 watts, how long can they both operate before discharging a 50 ampere-hour 12 volt battery?

A. 40 minutes.
B. 1 hour.
C. 1 1/2 hours.
D. 6 hours.

Answer 4

C. 1 1/2 hours.

Question 5

3-61I5: A 6 volt battery with 1.2 ohms internal resistance is connected across two light bulbs in parallel whose resistance is 12 ohms each. What is the current flow?

A. 0.57 amps.
B. 0.83 amps.
C. 1.0 amps.
D. 6.0 amps.

Answer 5

B. 0.83 amps.

Question 6

3-61I6: A 12.6 volt, 8 ampere-hour battery is supplying power to a receiver that uses 50 watts and a RADAR system that uses 300 watts. How long will the battery last?

A. 100.8 hours.
B. 27.7 hours.
C. 1 hour.
D. 17 minutes or 0.3 hours.

Answer 6

D. 17 minutes or 0.3 hours.