Electrolysis And Storage Of Batteries(Engineering > Electrical Engineering ) Questions and Answers

Question 1. When the specific gravity of the electrolyte of a lead-acid cell is reduced to 1.1 to 1.15 the cell is in
  1.    charged state
  2.    discharged state
  3.    both (A) and (B)
  4.    active state
Explanation:-
Answer: Option B. -> discharged state
Question 2. During charging the specific gravity of the electrolyte of a lead-acid battery
  1.    increases
  2.    decreases
  3.    remains the same
  4.    becomes zero
Explanation:-
Answer: Option A. -> increases
Question 3. While preparing electrolyte for a lead-acid battery
  1.    water is poured into acid
  2.    acid is poured into water
  3.    anyone of the two can be added to other chemical
  4.    none of the above
Explanation:-
Answer: Option B. -> acid is poured into water
Question 4. Electrolyte used in a lead-acid cell is
  1.    NaOH
  2.    only H₂SO₄
  3.    only water
  4.    dilute H₂SO₄
Explanation:-
Answer: Option D. -> dilute H₂SO₄
Question 5. The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is
  1.    just one
  2.    always greater than one
  3.    always less than one
  4.    none of the above
Explanation:-
Answer: Option B. -> always greater than one
Question 6. Shelf life of a small dry cell is
  1.    equal to that of large dry cell
  2.    less than that of large dry cell
  3.    more than that of large dry cell
  4.    none of the above
Explanation:-
Answer: Option B. -> less than that of large dry cell
Question 7. The best indication about the state of charge on a lead-acid battery is given by
  1.    output voltage
  2.    temperature of electrolyte
  3.    specific gravity of electrolyte
  4.    none of the above
Explanation:-
Answer: Option C. -> specific gravity of electrolyte
Question 8. Each cell has a vent cap
  1.    to allow gases out when the cell is on charge
  2.    to add water to the cell if needed
  3.    to check the level of electrolyte
  4.    to do all above functions
Explanation:-
Answer: Option D. -> to do all above functions
Question 9. The capacity of a lead-acid cell is measured in
  1.    amperes
  2.    ampere-hours
  3.    watts
  4.    watt-hours
Explanation:-
Answer: Option B. -> ampere-hours
Question 10. The watt-hour efficiency of a lead-acid cell varies between
  1.    25 to 35%
  2.    40 to 60%
  3.    70 to 80%
  4.    90 to 95%
Explanation:-
Answer: Option C. -> 70 to 80%
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