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MCQs

Total Questions : 236 | Page 8 of 24 pages
Question 71. 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
 Discuss Question
Answer: Option B. -> negative active material
Question 72. The common impurity in the electrolyte of lead-acid battery is
  1.    chlorine
  2.    dust particles
  3.    lead crystals
  4.    iron
 Discuss Question
Answer: Option D. -> iron
Question 73. The substances which combine together to store electrical energy during the charge are called ______ materials
  1.    active
  2.    passive
  3.    inert
  4.    dielectric
 Discuss Question
Answer: Option A. -> active
Question 74. 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
 Discuss Question
Answer: Option D. -> All above will occur
Question 75. 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
 Discuss Question
Answer: Option D. -> all above conditions
Question 76. Which of the following is incorrect?
  1.    A storage cell has a reversible chemical reaction
  2.    A lead-acid cell can be recharged
  3.    A carbon-zinc cell has unlimited shelf life
  4.    A primary cell has an irreversible chemical reaction
 Discuss Question
Answer: Option C. -> A carbon-zinc cell has unlimited shelf life
Question 77. Weston standard cell at 20°C has voltage of ____ volts.
  1.    0.8
  2.    0.9
  3.    1.0187
  4.    1.5
 Discuss Question
Answer: Option C. -> 1.0187
Question 78. 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
 Discuss Question
Answer: Option A. -> decreases
Question 79. 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
 Discuss Question
Answer: Option B. -> increases
Question 80. A battery of 6 cells will show a drop of _____ volts from fully charged state to fully discharged state.
  1.    1.0
  2.    1.5
  3.    2.4
  4.    2.9
 Discuss Question
Answer: Option C. -> 2.4

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