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Which of the following device is used in the specific gravity test?

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in Automotive Engine Design by (137k points)
Which of the following device is used in the specific gravity test?

(a) Cadmium rod

(b) Voltmeter

(c) Cell voltage tester

(d) Hydrometer

The question was posed to me during a job interview.

Asked question is from Battery Testing topic in division Storage Batteries of Automotive Engine Design

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Best answer
Right option is (d) Hydrometer

Best explanation: The battery is filled with electrolyte. The specific gravity test is conducted with the help of a hydrometer. The hydrometer is in the form of a glass tubular body with a rubber bulb at the top and a sampler tube at the bottom. There is a glass float inside the glass body.

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