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Which of the following helps in the identification of the state of the battery?

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in Automotive Engine Design by (137k points)
Which of the following helps in the identification of the state of the battery?

(a) Latent heat of vaporization

(b) Entropy

(c) Latent heat of the cooling

(d) Specific gravity

I had been asked this question in unit test.

My doubt is from Battery Charging in division Storage Batteries of Automotive Engine Design

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Correct choice is (d) Specific gravity

The explanation: The state of the battery charge is checked most commonly by the specific gravity. The temperature is also recorded and the gravity reading is corrected accordingly. This is then compared with the chart supplied by the battery manufacturer to ascertain whether the battery needs to be charged or not.

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