Electrolysis And Storage Of Batteries(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. 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 5. 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 6. In a lead-acid cell, lead is called as
  1.    positive active material
  2.    negative active material
  3.    passive material
  4.    none of the above
Explanation:-
Answer: Option B. -> negative active material
Question 7. The substances which combine together to store electrical energy during the charge are called ______ materials
  1.    active
  2.    passive
  3.    inert
  4.    dielectric
Explanation:-
Answer: Option A. -> active
Question 8. If a lead-acid cell is discharged below 1.8 V the following will happen.
  1.    Capacity of cell will reduce
  2.    Sulphation of plates will occur
  3.    Internal resistance will increase
  4.    All above will occur
Explanation:-
Answer: Option D. -> All above will occur
Question 9. The common impurity in the electrolyte of lead-acid battery is
  1.    chlorine
  2.    dust particles
  3.    lead crystals
  4.    iron
Explanation:-
Answer: Option D. -> iron
Question 10. Sulphated cells are indicated by
  1.    the loss of capacity of the cell
  2.    the decrease of the specific gravity
  3.    the low voltage of the cell on discharge
  4.    all above conditions
Explanation:-
Answer: Option D. -> all above conditions
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