MCQ on Lead Acid Battery

1. Internal resistance of primary cell varies

(a) inversely with the distance between electrodes
(b) inversely with the surface area of electrodes
(c) directly with the distance between electrodes
(d) with the nature of electrodes
(e) all of above except (a)

2. If the battery has zero internal resistance and the external resistance R is gradually reduced in the circuit shown in the Figure. The voltmeter reading will

(a) decrease
(b) increase
(c) remain constant

3. In the circuit shown above if battery has some definite internal resistance and R is gradually reduced, the voltmeter reading will

(a) increase
(b) decrease
(c) remain unchanged

4. For a group of cells, when internal resistance of the group is equal to external load resistance, the group will deliver maximum

(a) voltage
(b) current
(c) ampere-hours
(d) efficiency

5. An arrangement of 12 cells, each of internal resistance 1.5 ohm, to give maximum current in external load resistance of 2 ohm will be

(a) all 12 cells in series
(b) all 12 cells in parallel
(c) 4 cells in series with 3 rows in parallel
(d) 3 cells in series with 4 rows in parallel

6. A standard cell

(a) will have accurate and constant voltage when current drawn from it is few micro amperes only
(b) will have accurate and constant voltage when current drawn from it is few mill amperes only
(c) will continue to have constant voltage irrespective of loading conditions

7. Which of the following statement is incorrect about lead acid battries?

(a) the electrolyte is weak sulphuric acid
(b) when fully charged, both of the plates become lead-per-oxide
(c) the number of plates is always odd
(d) the number of negative plates is one more than the number of positive plates

8. Which of the following statement is correct about lead acid batteries

(a) it delivers current as soon as its components are put together
(b) density of electrolyte increases while delivering current
(c) it does not deliver current on putting its components together until it is supplied electrical energy from external source
(d) it has lead as positive plates

9. During discharging of lead acid cells, the terminal voltage decreases with the decrease in

(a) temperature
(b) discharge rate
(c) state of charge
(d) none of these

10. In a lead acid battery, separators are provided to

(a) reduce internal resistance
(b) facilitate flow of the current
(c) avoid internal short circuits
(d) increase the energy efficiency

11. In a lead acid battery, fillers are provided to

(a) facilitate flow of gases
(b) prevent flow of gases
(c) recover acid loss through vapors
(d) reduce tendency of polarization

12. Common impurity in a battery electrolyte is

(a) dust particles
(b) iron
(c) lead crystals
(d) sodium chloride

13. During charging and discharging of an Edison cell

(a) electrolyte does not take part in chemical reaction
(b) EMF remains the same
(c) corrosive fumes are produced
(d) nickel hydroxide remains unsplit

14. Nickel-cadmium accumulators in comparison to nickel-iron accumulators have the advantage of

(a) being lighter in weight and cheaper in price
(b) low internal resistance and longer life
(c) higher EMF and higher efficiency
(d) all of the above

15. A floating battery is one

(a) which is charged and discharged simultaneously
(b) in which battery voltage is equal to charger voltage
(c) which supplies current intermittently and also during getting charged
(d) none of the above

16. In a lead acid battery, sedimentation occurs due to

(a) idleness for a longer period
(b) over charging at slow rate
(c) over charging at high rate
(d) slow charging at low rate

17. In a lead acid battery, excessive formation of lead sulphate occurs due to

(a) idleness of battery for a long time
(b) low level of electrolyte
(c) persistent undercharging
(d) all of the above

18. Sulphated cells are indicated by the

(a) low specific gravity
(b) low voltage on discharge
(c) low capacity
(d) all of the above

19. Charging of a sulphated battery at high rate causes

(a) wrapping of plates
(b) boiling of electrolyte owing to gassing
(c) damage to separators, cell caps, covers and battery due to excessive heating
(d) all of the above

20. Short circuiting of a cell may be caused by

(a) buckling of plates
(b) breakdown of one or more separators
(c) excessive accumulation of sedimentation at the bottom of the cell
(d) lead particles forming circuits between positive and negative plates
(e) any of the above

21. Short circuiting of a cell results in

(a) reduced gassing during charging
(b) abnormal high temperature
(c) low specific gravity of electrolyte
(d) all of the above

22. Over charging of a lead acid battery would cause

(a) excessive gassing
(b) loss of active material
(c) increase in temperature resulting in buckling of plates
(d) all of the above

23. In comparison to constant current charging method, the constant voltage charging method of lead acid battery has the advantages of

(a) increasing capacity of the battery
(b) reducing charging time
(c) avoiding of excessive gassing
(d) both (b) and (c)

24. The condition of fully charged lead acid battery cannot be ascertained by

(a) gassing
(b) voltage
(c) color of the electrodes
(d) specific gravity of the electrolyte
(d) color of the electrolyte

25. The EMF of a lead acid battery

(a) increases with the increase in specific gravity of the electrolyte
(b) slightly increases with the increase in temperature
(c) decreases with the increase in temperature
(d) both (a) and (b)

26. If the specific gravity of the electrolyte in a lead acid cell increases beyond 1.23 there will be

(a) loss of life
(b) loss of capacity
(c) increase in internal resistance
(d) corrosion of the grids of the plates

27. The energy capacity of a lead acid battery is rated in

(a) kWh
(b) kW
(c) ampere hours
(d) joules

28. The capacity of a lead acid battery does not depend upon

(a) charge rate
(b) discharge rate
(c) temperature
(d) density of electrolyte
(e) quantity of active material
(f) plate surface area

29. The capacity of a lead acid battery is adversely affected by increase

(a) discharge rate
(b) charge rate
(c) temperature
(d) specific gravity of the electrolyte

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