1. Life of the Edison cell is at least ?

five years

eight years

seven years

ten years

Answer: five years

Explanation:


2. The watt-hour efficiency of a lead-acid cell varies between ?

26 to 36%

40 to 60%

70 to 80%

90 to 95%

Answer: 70 to 80%

Explanation:


3. Proper charging rate of a battery in ampere is about ...... of its ampere-hour capacity ?

1/4

1/6

1/4

1/2

Answer: 1/4

Explanation:


4. Satellite power requirement is provided through ?

solar cells

dry cells

Nickel cadmium cells

lead-acid batteries

Answer: solar cells

Explanation:


5. The open-circuit e.m.f. of a storage cell is 2.2 V. The terminal voltage measured when current is 6 A is found to.be 1.98 V. The internal resistance of the cell is ?

0.00366 ?

0.0366 ?

0.366 ?

3.66 ?

Answer: 0.0366 ?

Explanation:


6. A cell which is used as a voltage reference source for instrument calibration is ?

dry cell

solar cell

mercury-cadmium cell

nickel-cadmium cell

Answer: mercury-cadmium cell

Explanation:


7. Local action in a battery is indicated by ?

excessive gassing under load conditions

excessive drop in the specific gravity of electrolyte even when the cell is on open circuit

both (a) and (b)

none of the above

Answer: none of the above

Explanation:


8. If a battery is wrongly connected on charge following will happen ?

current delivered by the battery will be high

current drawing will be nil

current drawing will be very small

current drawing will be very high

Answer: current drawing will be very high

Explanation:


9. Life of the batteries is in the following ascending order ?

Lead-acid cell, Edison cell, Nickel cadmium cell

Lead-acid cell, Nickel-cadmium cell, Edison cell

Edison cell, Nickel-cadmium cell, lead-acid cell

Nickel-cadmium cell, Edison cell, lead-acid cell

Answer: Lead-acid cell, Edison cell, Nickel cadmium cell

Explanation:


10. Internal resistance of a cell is reduced by ?

using vent plug to permit gas formed during discharge

increasing the plate area

putting plates very close together

all above methods

Answer: all above methods

Explanation: