Practice Test: Question Set - 04
1. In constant voltage charging method, the charging current from discharged to fully charged condition.
- (A) Decreases
- (B) Increases
- (C) Remains constant
- (D) None of the above
2. 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
- (A) 6 parts of acid to 4 parts of water
- (B) 4 parts of acid to 4 parts of water
- (C) 4 parts of acid to 6 parts of water
- (D) 4 parts of acid to 8 parts of water
3. Dry cell is modification of
- (A) Deniell cell
- (B) Leclanche cell
- (C) Lead-acid cell
- (D) Edison cell
4. Short circuiting of a cell may be caused
- (A) Buckling of plates
- (B) Faulty separators
- (C) Lead particles forming circuit between
positive and negative plates
- (D) Any one of above
5. Petroleum jelly is applied to the electrical connections to the lead-acid battery
- (A) Prevent local heating
- (B) Prevent short-circuiting
- (C) Reduce path resistance
- (D) Prevent corrosion
6. The charge required to liberate one gram equivalent of any substance is known as ________ constant.
- (A) Time
- (B) Faraday's
- (C) Boltzmann
- (D) None of these
7. The capacity of a battery is expressed in terms of
- (A) Current rating
- (B) Voltage rating
- (C) Ampere-hour rating
- (D) None of the above
8. The ampere-hour efficiency of a lead-acid cell is normally between
- (A) 20 to 30%
- (B) 40 to 50%
- (C) 60 to 70%
- (D) 90 to 95%
9. The open circuit voltage of any storage cell depends wholly upon
- (A) Its chemical constituents
- (B) On the strength of its electrolyte
- (C) Its temperature
- (D) All above
10. Each cell has a vent cap
- (A) To allow gases out when the cell is on
charge
- (B) To add water to the cell if needed
- (C) To check the level of electrolyte
- (D) To do all above functions
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