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Which of the following is correct about electronic display unit of universal measuring instrument?

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Which of the following is correct about electronic display unit of universal measuring instrument?

(a) Sensitive to electrical interference

(b) Non-removable

(c) Cast iron protection cover

(d) It is plug-in type

I had been asked this question in an online interview.

I'm obligated to ask this question of Universal Measuring Instrument topic in section Linear Measurements of Engineering Metrology

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Right choice is (d) It is plug-in type

The explanation is: It is insensitive to electrical interference and oil film. It is easily interchangeable. There is an aluminium protection cover for an electronic display unit.

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