Key Topic 60: Batteries-1

Question 1

3-60I1: When a lead-acid storage battery is being charged, a harmful effect to humans is:

A. Internal plate sulfation may occur under constant charging.
B. Emission of oxygen.
C. Emission of chlorine gas.
D. Emission of hydrogen gas.

Answer 1

D. Emission of hydrogen gas.

Question 2

3-60I2: A battery with a terminal voltage of 12.5 volts is to be trickle-charged at a 0.5 A rate. What resistance should be connected in series with the battery to charge it from a 100-V DC line?

A. 95 ohms.
B. 300 ohms.
C. 195 ohms.
D. None of these.

Answer 2

C. 195 ohms.

Question 3

3-60I3: What capacity in amperes does a storage battery need to be in order to operate a 50 watt transmitter for 6 hours? Assume a continuous transmitter load of 70% of the key-locked demand of 40 A, and emergency light load of 1.5 A.

A. 100 ampere-hours.
B. 177 ampere-hours.
C. 249 ampere-hours.
D. None of these.

Answer 3

B. 177 ampere-hours.

Question 4

3-60I4: What is the total voltage when 12 Nickel-Cadmium batteries are connected in series?

A. 12 volts.
B. 12.6 volts.
C. 15 volts.
D. 72 volts.

Answer 4

C. 15 volts.

Question 5

3-60I5: The average fully-charged voltage of a lead-acid storage cell is:

A. 1 volt.
B. 1.2 volts.
C. 1.56 volts.
D. 2.06 volts.

Answer 5

D. 2.06 volts.

Question 6

3-60I6: A nickel-cadmium cell has an operating voltage of about:

A. 1.25 volts.
B. 1.4 volts.
C. 1.5 volts.
D. 2.1 volts.

Answer 6

A. 1.25 volts.