Practice Test: Question Set - 05
1. Sulphated cells are indicated by
- (A) The loss of capacity of the cell
- (B) The decrease of the specific gravity
- (C) The low voltage of the cell on discharge
- (D) All above conditions
2. Excessive charging a battery tends to
- (A) Produce gassing
- (B) Increase the internal resistance of the battery
- (C) To corrode the positive plates into lead
peroxide thereby weakening them physically
- (D) Bring about all above changes
3. Specific gravity of electrolyte in Edison cell is
- (A) 0.8
- (B) 0.95
- (C) 1.1
- (D) 1.21
4. In a battery cover is placed over the element and sealed to the top of the battery container. This is done
- (A) To reduce evaporation of water from
electrolyte
- (B) To exclude dirt and foreign matter from the
electrolyte
- (C) To discharge both of the above functions
- (D) To discharge none of the above functions
5. The common impurity in the electrolyte of lead-acid battery is
- (A) Chlorine
- (B) Dust particles
- (C) Lead crystals
- (D) Iron
6. A constant-voltage generator has
- (A) Minimum efficiency
- (B) Minimum current capacity
- (C) Low internal resistance
- (D) High internal resistance
7. During the charging of a lead-acid cell
- (A) Its voltage increases
- (B) It gives out energy
- (C) Its cathode becomes dark chocolate brown in color
- (D) Specific gravity of H2SO4
decreases
8. Cells are connected in series in order to
- (A) Increase the voltage rating
- (B) Increase the current rating
- (C) Increase the life of the cells
- (D) None of the above
9. The watt-hour efficiency of a lead-acid cell varies between
- (A) 25 to 35%
- (B) 40 to 60%
- (C) 70 to 80%
- (D) 90 to 95%
10. Life of the Edison cell is at least
- (A) Five years
- (B) Seven years
- (C) Eight years
- (D) Ten years
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