Practice Test: Question Set - 02
1. Internal resistance of a cell is reduced by
- (A) Using vent plug to permit gas formed during
discharge
- (B) Increasing the plate area
- (C) Putting plates very close together
- (D) All above methods
2. If a battery is wrongly connected on charge following will happen
- (A) Current delivered by the battery will be
high
- (B) Current drawing will be nil
- (C) Current drawing will be very small
- (D) Current drawing will be very high
3. The following indicate that battery on charge has attained full charge
- (A) Color of electrode
- (B) Gassing
- (C) Specific gravity
- (D) All above
4. Hydrogen evolved during charging produces explosive mixture when it is more than
- (A) 2 %
- (B) 4 %
- (C) 6 %
- (D) 8 %
5. Under normal charging rate, the charging current should be
- (A) 10% of capacity
- (B) 20% of capacity
- (C) 30% of capacity
- (D) 40% of capacity
6. The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is
- (A) Just one
- (B) Always greater than one
- (C) Always less than one
- (D) None of the above
7. As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of
- (A) Reducing time of charging
- (B) Increasing cell capacity
- (C) Both (A) and (B)
- (D) Avoiding excessive gassing
8. The capacity of a lead-acid cell is measured in
- (A) Amperes
- (B) Ampere-hours
- (C) Watts
- (D) Watt-hours
9. Negative plate of an Edison cell is made of
- (A) Copper
- (B) Lead
- (C) Iron
- (D) Silver oxide
10. Following will occur if level of electrolyte falls below plates
- (A) Capacity of the cell is reduced
- (B) Life of the cell is reduced
- (C) Open plates are converted to lead sulphate
- (D) All above
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