1. Which of the following factors adversely affects the capacity of the lead acid battery ?

Temperature of surroundings

Specific gravity of electrolyte

Rate of discharge

All of the above

Answer: All of the above

Explanation:


2. Electric supply for electroplating should be ?

low voltage a.c. voltage

low frequency a.c. voltage

d.c. voltage

any of the above

Answer: d.c. voltage

Explanation:


3. In electroplating the current efficiency is usually ?

40 to 50%

60 to 70%

80 to 90%

90 to 98%

Answer: 90 to 98%

Explanation:


4. Which of the following substance when added to electrolyte promotes smooth deposition ?

Glucose

Albumen

Gelatine

Any of the above

Answer: Any of the above

Explanation:


5. ln case of a lead-acid battery a wet battery cover indicates ?

over filling of the battery

excessive gassing during charging

leaky seals at covers

any of the above

Answer: any of the above

Explanation:


6. Which of the following cell has a reversible chemical reaction ?

Lead-acid

Mercury oxide

Carbon-zinc

Silver-oxide

Answer: Lead-acid

Explanation:


7. Weston standard cell at 20ÂșC has voltage of ...... volts ?

0.8

0.9

1.0187

1.5

Answer: 1.0187

Explanation:


8. Persons preparing electrolyte should wear ?

goggles or other face shield

rubber

rubber boots and gloves

all above safety devices

Answer: all above safety devices

Explanation:


9. Sulphated cells are indicated by ?

the loss of capacity of the cell

the decrease of the specific gravity

the low voltage of the cell on discharge

all above conditions

Answer: all above conditions

Explanation:


10. Undercharging ?

reduces specific gravity of the electrolyte

increases specific gravity of the electrolyte

produces excessive gassing

increases the temperature

Answer: reduces specific gravity of the electrolyte

Explanation: