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Which of the following is used as a replacement of spirit vial in electrical level?

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Which of the following is used as a replacement of spirit vial in electrical level?

(a) Steel rule

(b) Protractor

(c) Square block

(d) Pendulum

This question was addressed to me during an interview.

This key question is from Spirit Level in chapter Linear Measurements of Engineering Metrology

1 Answer

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Best answer
Correct choice is (d) Pendulum

For explanation I would say: In an electrical level, a pendulum is present in place of spirit vial. Displacement of a pendulum is amplified by electrical means or electrically. A separate meter is used to show the readings.

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