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MCQs

Total Questions : 236 | Page 5 of 24 pages
Question 41. Following will occur if level of electrolyte falls below plates
  1.    capacity of the cell is reduced
  2.    life of the cell is reduced
  3.    open plates are converted to lead sulphate
  4.    all above
 Discuss Question
Answer: Option D. -> all above
Question 42. Which of the following factors adversely affects the capacity of the leadacid battery ?
  1.    Temperature of surroundings
  2.    Specific gravity of electrolyte
  3.    Rate of discharge
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 43. In order that a hydrometer may float vertically in electrolyte its C.G. should be
  1.    lowered
  2.    raised
  3.    undisturbed
  4.    displaced sideways
 Discuss Question
Answer: Option A. -> lowered
Question 44. The active materials on the positive and negative plates of a fully charged lead-acid battery are
  1.    lead and lead peroxide
  2.    lead sulphate and lead
  3.    lead peroxide and lead
  4.    none of the above
 Discuss Question
Answer: Option C. -> lead peroxide and lead
Question 45. The current flow through electrolyte is due to the movement of
  1.    ions
  2.    holes
  3.    electrons
  4.    none of the above
 Discuss Question
Answer: Option A. -> ions
Question 46. Cells are connected in parallel to
  1.    Increase the efficiency
  2.    Increase the current capacity
  3.    Increase the voltage output
  4.    Increase the internal resistance
 Discuss Question
Answer: Option B. -> Increase the current capacity
Question 47. On the average the ampere-hour efficiency of an Edison cell is about
  1.    40%
  2.    60%
  3.    70%
  4.    80%
 Discuss Question
Answer: Option D. -> 80%
Question 48. On overcharging a battery
  1.    It will bring about chemical change in active materials
  2.    It will increase the capacity of the battery
  3.    It will raise the specific gravity of the electrolyte
  4.    None of the above will occur
 Discuss Question
Answer: Option D. -> None of the above will occur
Question 49. The active material of the positive plates of silver-zinc batteries is
  1.    silver oxide
  2.    lead oxide
  3.    lead
  4.    zinc powder
 Discuss Question
Answer: Option A. -> silver oxide
Question 50. Batteries are charged by
  1.    rectifiers
  2.    engine generator sets
  3.    motor generator sets
  4.    any one of the above methods
 Discuss Question
Answer: Option D. -> any one of the above methods

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