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By how much variation in the gravity points cell gravity variation can be found?

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in Automotive Engine Design by (137k points)
By how much variation in the gravity points cell gravity variation can be found?

(a) 9

(b) 5

(c) 10

(d) 6

This question was addressed to me in homework.

This key question is from Battery Troubles in chapter Storage Batteries of Automotive Engine Design

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Correct answer is (c) 10

To elaborate: Cell gravity variation is one among the other battery troubles during the cell gravity variation the gravity readings of all the cells should be the same. If the reading of some cells is different from the rest by more than 10 gravity points, it indicates the loss of acid from a cell.

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