Most recently Electrolysis and Storage of Batteries Multiple choice Questions and Answers pdf

41. The open circuit voltage of any storage cell depends wholly upon
(a) its chemical constituents
(b) on the strength of its electrolyte
(c) its temperature    
(d) all above
Ans: d

42. The specific gravity of electrolyte is measured by
(a) manometer
(6) a mechanical gauge
(c) hydrometer    
(d) psychrometer
Ans: c

43. When the specific gravity of the electrolyte of a lead-acid cell is reduced to 1.1 to 1.15 the cell is in
(a) charged state
(b) discharged state
(c) both (a) and (b)
(d) active state
Ans: b

44. In ______ system the charging current is intermittently controlled at either a maximum or minimum value
(a)     two rate charge control
(b)     trickle charge
(c) floating charge
(d) an equalizing charge
Ans: a

45. Over charging
(a) produces excessive gassing
(b) loosens the active material
(e) increases the temperature resulting in buckling of plates
(d)     all above
Ans: d

46. Undercharging
(a)     reduces specific gravity of the electrolyte
(b)     increases specific gravity of the electrolyte
(c) produces excessive gassing
(d) increases the temperature
Ans: a

47. Internal short circuits are caused by
(a)     breakdown of one or more separators
(b)     excess accumulation of sediment at the bottom of the cell
(c) both (a) and (b)
(d) none of the above
Ans: c

48. The effect of sulphation is that the internal resistance
(a) increases
(b) decreases
(c) remains same
(d) none of the above
Ans: a

49. Excessive formation of lead sulphate on the surface of the plates happens because of
(a)     allowing a battery to stand in discharged condition for a long time
(b)     topping up with electrolyte
(c) persistent undercharging
(d) low level of electrolyte
(e) all above
Ans: e

50. The substances which combine together to store electrical energy during the charge are called ______ materials
(a) active
(b) passive
(c) inert
(d) dielectric
Ans: a

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