Electrolysis and Storage of Batteries

41. 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

Correct answer: (D)
All above will occur

42. In _________ system the charging current is intermittently controlled at either a maximum or minimum value

  1. two rate charge control
  2. trickle charge
  3. floating charge
  4. an equalizing charge

Correct answer: (A)
two rate charge control

43. In a battery cover is placed over the element and sealed to the top of the battery container. This is done

  1. to reduce evaporation of water from electrolyte
  2. to exclude dirt and foreign matter from the electrolyte
  3. to discharge both of the above functions
  4. to discharge none of the above functions

Correct answer: (C)
to discharge both of the above functions

44. In a lead-acid battery the energy is stored in the form of

  1. charged ions
  2. chemical energy
  3. electrostatic energy
  4. electromagnetic energy

Correct answer: (B)
chemical energy

45. In a lead-acid cell dilute sulphuric acid (electrolyte) approximately comprises the following

  1. one part H2O, three parts H2SO4
  2. two parts H2O, two parts H2SO4
  3. three parts H2O, one part H2SO4
  4. all H2S04

Correct answer: (C)
three parts H2O, one part H2SO4

46. In a lead-acid cell, if the specific gravity of sulphuric acid is 1.8, it will require following ratio of acid to water to get mixture of specific gravity of 1.3

  1. 6 parts of acid to 4 parts of water
  2. 4 parts of acid to 4 parts of water
  3. 4 parts of acid to 6 parts of water
  4. 4 parts of acid to 8 parts of water

Correct answer: (C)
4 parts of acid to 6 parts of water

47. 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

Correct answer: (B)
negative active material

48. In alkaline cell the electrolyte is

  1. dilute sulphuric acid
  2. concentrated sulphuric acid
  3. NaOH
  4. KOH

Correct answer: (D)
KOH

49. In constant voltage charging method, the charging current from discharged to fully charged condition

  1. decreases
  2. increases
  3. remains constant
  4. none of the above

Correct answer: (A)
decreases

50. In constant-current charging method, the supply voltage from discharged to fully charged condition

  1. decreases
  2. increases
  3. remains constant
  4. none of the above

Correct answer: (B)
increases

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