Chapter 12 - Batteries - Grob's Basic Electronics 13th

Which of the following cells is not a primary cell? a. carbon-zinc. b. alkaline. c. zinc chloride. d. lead-acid.

d

The DC output voltage of a C-size alkaline cell is: a. 1.2 V. b. 1.5 V. c. 2.1 V. d. about 3 V.

b

Which of the following cells is a secondary cell? a. silver oxide. b. lead-acid. c. nickel-cadmium. d. both b and c.

d

What happens to the internal resistance, ri, of a voltaic cell as the cell deteriorates? a. It increases. b. It decreases. c. It stays the same. d. It usually disappears.

a

The DC output voltage of a lead-acid cell is: a. 1.35 V. b. 1.5 V. c. 2.1 V. d. about 12 V.

c

Cells are connected in series to: a. increase the current capacity. b. increase the voltage output. c. decrease the voltage output. d. decrease the internal resistance.

b

Cells are connected in parallel to: a. increase the current capacity. b. increase the voltage output. c. decrease the voltage output. d. decrease the current capacity.

a

Five D-size alkaline cells in series have a combined voltage of: a. 1.5 V. b. 5.0 V. c. 7.5 V. d. 11.0 V.

c

The main difference between a primary cell and a secondary cell is that: a. a primary cell can be recharged and a secondary cell cannot. b. a secondary cell can be recharged and a primary cell cannot. c. a primary cell has an unlimited shelf life and a secondary cell does not. d. primary cells produce a DC voltage and secondary cells produce an AC voltage.

b

A constant-voltage source: a. has very high internal resistance. b. supplies constant-current to any load resistance. c. has very low internal resistance. d. none of the above.

c

A constant-current source: a. has very low internal resistance. b. supplies constant current to a wide range of load resistances. c. has very high internal resistance. d. both b and c.

d

The output voltage of a battery drops from 6.0 V with no load to 5.4 V with a load current of 50 mA. How much is the internal resistance, ri? a. 12 Ω. b. 108 Ω. c. 120 Ω. d. It cannot be determined.

a

Maximum power is transferred from a generator to a load when: a. RL = ri. b. RL is maximum. c. RL is minimum. d. RL is 10 or more times the value of ri.

a

What is the efficiency of power transfer for the matched load condition? a. 100%. b. 0%. c. 50%. d. It cannot be determined.

c

The internal resistance of a battery: a. cannot be measured with an ohmmeter. b. can be measured with an ohmmeter. c. can be measured indirectly by determining how much the output voltage drops for a given load current. d. both a and c.

d